[ { "part": "GENx ENGINE CAT B2", "title": "ATA 71: POWER PLANT", "ch": "GEnx for 787 can maintain a high internal engine pressure ratios (9.5:1) due to: (A, B1, B2)", "ansGr": [ { "ans": [ "The improvement of the specific fuel consumption. ", "false" ] }, { "ans": [ "The fact that there is no external engine air bleeds taken for aircraft. ", "true" ] }, { "ans": [ "Chevron shape on the exit edge of the thrust reverser translating sleeves. ", "false" ] } ], "ref": "Reference: Page 10/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "GEnx anti-ice system includes: (A, B1, B2)", "ansGr": [ { "ans": [ "A booster intake anti-ice (BAI) system and an engine intake anti-ice (EAI) system. ", "true" ] }, { "ans": [ "An engine intake anti-ice (EAI) system and a turbine anti-ice (TAI) system ", "false" ] }, { "ans": [ "A booster intake anti-ice (BAI) system and a turbine anti-ice (TAI) system. ", "false" ] } ], "ref": "Reference: Page 10/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "The purpose of chevrons on the exit edges of the thrust reverser translating sleeves is: (A, B1, B2)", "ansGr": [ { "ans": [ "To reduce weight. ", "false" ] }, { "ans": [ "To gradually mix the bypass airflow with the atmospheric air to decrease noise levels. ", "true" ] }, { "ans": [ "To minimize the chance of lightning strike. ", "false" ] } ], "ref": "Reference: Page 20/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "The fan cowls weigh 68kg each and are:(A, B1, B2)", "ansGr": [ { "ans": [ "Interchangeable between engines. ", "false" ] }, { "ans": [ "NOT interchangeable between engines. ", "true" ] }, { "ans": [ "Interchangeable between LH and RH of the engine. ", "false" ] } ], "ref": "Reference: Page 26/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "The fan cowls are attached to(A, B1, B2)", "ansGr": [ { "ans": [ "Fan Cowl Support Beam (FCSB) with 03 hinges. ", "false" ] }, { "ans": [ "Fan Cowl Support Beam (FCSB) with 04 hinges. ", "true" ] }, { "ans": [ "Fan case with 04 hinges. ", "false" ] } ], "ref": "Reference: Page 26/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "GEnx is equipped with The fan cowls are attached to(A, B1, B2)", "ansGr": [ { "ans": [ "01 PDOS control switch for each cowl. ", "true" ] }, { "ans": [ "02 PDOS control switch for each cowl. ", "false" ] }, { "ans": [ "04 PDOS control switch for fan cowls. ", "false" ] } ], "ref": "Reference: Page 42/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "title": "ATA 72: ENGINE", "ch": "Which of the following statements is NOT true: (A, B1, B2)", "ansGr": [ { "ans": [ "The HP rotates clockwise as viewed from front. ", "true" ] }, { "ans": [ "The GEnx engine has counter rotating low pressure (LP) and high pressure (HP) rotors. ", "false" ] }, { "ans": [ "The LP rotates clockwise as viewed from the front. ", "false" ] } ], "ref": "Reference: Page 156/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following is NOT part of LP rotor: (A, B1, B2)", "ansGr": [ { "ans": [ "Single-stage fan and 4-stage booster low pressure compressor. ", "false" ] }, { "ans": [ "7-stage low pressure turbine. ", "false" ] }, { "ans": [ "10-stage low pressure turbine. ", "true" ] } ], "ref": "Reference: Page 156/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following is NOT part of HP rotor: (A, B1, B2)", "ansGr": [ { "ans": [ "10-stage high pressure compressor. ", "false" ] }, { "ans": [ "2-stage high pressure turbine. ", "false" ] }, { "ans": [ "7-stage high pressure compressor. ", "true" ] } ], "ref": "Reference: Page 156/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Exhaust Gas Temperature is measured at station: (A, B1, B2)", "ansGr": [ { "ans": [ "48 - HPT exit. ", "true" ] }, { "ans": [ "3 – HPC exit. ", "false" ] }, { "ans": [ "5 – LPT exit. ", "false" ] } ], "ref": "Reference: Page 160/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "title": "ATA 73: ENGINE FUEL AND CONTROL", "ch": "The unit that control the fuel flow is called: (A, B1, B2)", "ansGr": [ { "ans": [ "FMU. ", "true" ] }, { "ans": [ "HMU. ", "false" ] }, { "ans": [ "HCU. ", "false" ] } ], "ref": "Reference: Page 232/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Fuel is used to cool oil in: (A, B1, B2)", "ansGr": [ { "ans": [ "Main Fuel/Oil Heat Exchanger (FOHE). ", "false" ] }, { "ans": [ "Dual VFSG Fuel/Oil Heat Exchanger (FOHE). ", "false" ] }, { "ans": [ "Dual VFSG Fuel/Oil Heat Exchanger (FOHE) and Main FOHE. ", "true" ] } ], "ref": "Reference: Page 232/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "After Fuel Metering Unit (FMU) fuel is divided to the manifolds by(A, B1, B2)", "ansGr": [ { "ans": [ "Fuel Staging Valve. ", "false" ] }, { "ans": [ "Fuel Split Valve (FSV). ", "true" ] }, { "ans": [ "Fuel Flow Divider. ", "false" ] } ], "ref": "Reference: Page 232/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following statement is TRUE: (A, B1, B2)", "ansGr": [ { "ans": [ "At start, the Fuel Metering Valve (FMV) lets fuel go from the Bypass Valve (BPV) through the FMV to the jet pump and heat exchangers. ", "true" ] }, { "ans": [ "As the engine increases in speed for start, the FMV increases the quantity of the fuel to the BPV ", "false" ] }, { "ans": [ "The BPV controls the position of the FMV. ", "false" ] } ], "ref": "Reference: Page 252/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following manifolds always supplies fuel to all 22 fuel nozzles: (A, B1, B2)", "ansGr": [ { "ans": [ "Pilot primary and main un-staged (PPMU). ", "false" ] }, { "ans": [ "Pilot primary and main staged (PPMS). ", "false" ] }, { "ans": [ "Pilot secondary (PSEC). ", "true" ] } ], "ref": "Reference: Page 260/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "The fuel nozzles are set at equal spaces around the circumference of the combustor and numbered in a(A, B1, B2)", "ansGr": [ { "ans": [ "Clockwise sequence, looking forward with number 1 is at the 12:00 position. ", "true" ] }, { "ans": [ "Counter-clockwise sequence, looking forward with number 1 is at the 12:00 position. ", "false" ] }, { "ans": [ "Clockwise sequence, forward looking aft with number 1 is at the 12:00 position. ", "false" ] } ], "ref": "Reference: Page 264/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "When does EEC get power from Permanent Magnetic Alternator (PMA) (A, B1, B2)", "ansGr": [ { "ans": [ "N2 >= 5%. ", "false" ] }, { "ans": [ "N2 >= 8%. ", "true" ] }, { "ans": [ "N2 >= 7%. ", "false" ] } ], "ref": "Reference: Page 276,288/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "What information does engine rating plug provide to EEC? (A, B1, B2)", "ansGr": [ { "ans": [ "Engine rating and N2 trim levels. ", "false" ] }, { "ans": [ "Engine rating and N2 levels. ", "false" ] }, { "ans": [ "Engine rating and N1 trim levels. ", "true" ] } ], "ref": "Reference: Page 284/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "title": "ATA 74/80: IGNITION/STARTING", "ch": "During subsequent starts, the EEC changes between ignition systems every 2nd start attempt, that means(A, B1, B2)", "ansGr": [ { "ans": [ "It will use system 1 for 2 start attempts then system 2 for 2 start attempts. ", "true" ] }, { "ans": [ "It will use system 1 for 1 start attempt then system 2 for 1 start attempt. ", "false" ] }, { "ans": [ "It will use system 1 for 2 start attempts then system 2 for 1 start attempt. ", "false" ] } ], "ref": "Reference: Page 224/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The exciters are cooled by: (A, B1, B2)", "ansGr": [ { "ans": [ "CCC valve cooling air. ", "false" ] }, { "ans": [ "Under cowl compartment cooling air. ", "false" ] }, { "ans": [ "Fan air. ", "true" ] } ], "ref": "Reference: Page 228/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The ignition system components are on the …… side of the engine: (A, B1, B2)", "ansGr": [ { "ans": [ "RH. ", "false" ] }, { "ans": [ "LH. ", "true" ] }, { "ans": [ "Bottom. ", "false" ] } ], "ref": "Reference: Page 240/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following is NOT true: (A, B1, B2)", "ansGr": [ { "ans": [ "The engine start system is an auto-start system. ", "false" ] }, { "ans": [ "There is no manual start mode. ", "false" ] }, { "ans": [ "The AUTO start switch is normally in the ON position. ", "true" ] } ], "ref": "Reference: Page 246/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "During GEnx engine start: (A, B1, B2)", "ansGr": [ { "ans": [ "The air starter turns the engine N2 rotor through the accessory drive gearbox. ", "false" ] }, { "ans": [ "The VFSG turns the engine N2 rotor through the accessory drive gearbox. ", "true" ] }, { "ans": [ "The pneumatic starter turns the engine N2 rotor through the accessory drive gearbox. ", "false" ] } ], "ref": "Reference: Page 246/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "During normal engine start: (A, B1, B2)", "ansGr": [ { "ans": [ "Only 01 VFSG is used. ", "false" ] }, { "ans": [ "Both VFSG are used. ", "true" ] }, { "ans": [ "The VFSG will take turn to start the engine. ", "false" ] } ], "ref": "Reference: Page 248/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "title": "ATA 75: AIR", "ch": "How does EEC control the BAI valve: (B1,B2)", "ansGr": [ { "ans": [ "The EEC gets signals from PS3 sensor and uses an icing schedule to calculate conditions for control of the valve. ", "false" ] }, { "ans": [ "The EEC gets signals from P0 sensor and uses an icing schedule to calculate conditions for control of the valve. ", "false" ] }, { "ans": [ "The EEC gets signals from the airplane systems and uses an icing schedule to calculate conditions for control of the valve. ", "true" ] } ], "ref": "Ref: Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing - Powerplant Book 3 of 3, GEnx Engine, GE Engines – Air, page 156." }, { "ch": "The booster anti-icing (BAI) system uses 7th stage air from the airplane engine anti-ice (EAI) system to send heat to the booster splitter. Which of the following is TRUE: (A, B1, B2)", "ansGr": [ { "ans": [ "BAI valve is controlled by EMU. ", "false" ] }, { "ans": [ "There is no flight deck control for the system. ", "true" ] }, { "ans": [ "EAI valve need to be closed for BAI valve operation. ", "false" ] } ], "ref": "Reference: Page 156/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The core compartment cooling (CCC) valve sends cooling air from the fan/booster bypass ducts to components on the engine core case. It is(A, B1, B2)", "ansGr": [ { "ans": [ "Spring loaded to OPEN position. ", "true" ] }, { "ans": [ "Spring loaded to CLOSE position. ", "false" ] }, { "ans": [ "Opened by the EEC using fuel through the FMU. ", "false" ] } ], "ref": "Reference: Page 178/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "LPTACC and HPTACC valves are located(A, B1, B2)", "ansGr": [ { "ans": [ "On the forward RH side of the HPC case. ", "false" ] }, { "ans": [ "On the LH side of the HPT case. ", "false" ] }, { "ans": [ "On the forward LH side of the HPC case. ", "true" ] } ], "ref": "Reference: Page 182,186/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "Which valve in the engine cooling system is NOT operated by servo fuel(A, B1, B2)", "ansGr": [ { "ans": [ "HPTACC valve. ", "false" ] }, { "ans": [ "CCC valve. ", "false" ] }, { "ans": [ "BAI valve. ", "true" ] } ], "ref": "Reference: Page 176/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The purpose of the Transient Bleed Valve (TBV) is to(A, B1, B2)", "ansGr": [ { "ans": [ "Remove the load on the high pressure compressor (HPC) when the engine accelerates to idle. ", "false" ] }, { "ans": [ "Remove the load on the high pressure compressor (HPC) during rapid deceleration. ", "false" ] }, { "ans": [ "Remove the load on the high pressure compressor (HPC) when the engine accelerates to idle and during rapid deceleration. ", "true" ] } ], "ref": "Reference: Page 206/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "title": "ATA 76: ENGINE CONTROLS", "ch": "Which of the following statements is TRUE: (A, B1, B2)", "ansGr": [ { "ans": [ "You can move the reverse thrust levers at any position of the forward thrust lever. ", "false" ] }, { "ans": [ "The reverse thrust lever is blocked when the forward thrust lever is forward of idle a minimum of 3 degrees. ", "true" ] }, { "ans": [ "The forward thrust lever is not blocked when a reverse thrust lever is moved more than 8.5 degrees. ", "false" ] } ], "ref": "Reference: Page 337/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "Each thrust lever mechanically connects to 2 thrust lever angle (TLA) resolvers, which of the following statements is NOT true: (A, B1, B2)", "ansGr": [ { "ans": [ "The thrust control system can continue normal operation with a failure of one resolver. ", "false" ] }, { "ans": [ "If both resolvers fail electrically, the EEC holds the last valid value for the rest of the flight. ", "false" ] }, { "ans": [ "If both resolvers fail electrically, the EEC holds the last valid value for 2 seconds, then sets the engine thrust to idle. ", "true" ] } ], "ref": "Reference: Page 344/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "P0 is used by the EEC as a backup to the airplane ambient pressure input. This pressure is taken from: (A, B1, B2)", "ansGr": [ { "ans": [ "P0 sensing port in each fan cowl at the 4 o'clock or 8 o'clock position. ", "true" ] }, { "ans": [ "P0 sensing port in each reverser cowl at the 4 o'clock or 8 o'clock position ", "false" ] }, { "ans": [ "P0 sensing port in each fan cowl at the 2 o'clock or 10 o'clock position. ", "false" ] } ], "ref": "Reference: Page 356/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "ch": "What is Thrust control malfunction accommodation (TCMA)? (A, B1, B2)", "ansGr": [ { "ans": [ "TCMA is the engine control function that prevents a TCM event from becoming hazardous to the airplane in the air. ", "false" ] }, { "ans": [ "TCMA is the engine control function that prevents a TCM event from becoming hazardous to the airplane while on the ground. ", "true" ] }, { "ans": [ "TCMA is the engine control function that prevents a TCM event from becoming hazardous to the airplane while on the ground and in the air. ", "false" ] } ], "ref": "Reference: Page 372/382 of 4B Power plant, Engine, Fuel & Control, and Engine Controls – Power plant Book 2 of 3, 787 Training Lab Notebook" }, { "title": "ATA 77: ENGINE INDICATING", "ch": "N1 speed sensor is located(A, B1, B2)", "ansGr": [ { "ans": [ "On the fan case. ", "false" ] }, { "ans": [ "On the back of the fan hub frame at the 7:00 position on the engine core. ", "true" ] }, { "ans": [ "On the gearbox. ", "false" ] } ], "ref": "Reference: Page 96/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following statements is TRUE: (A, B1, B2)", "ansGr": [ { "ans": [ "N2 will show on the EICAS without EEC power applied. ", "true" ] }, { "ans": [ "N1 will show on the EICAS without EEC power applied. ", "false" ] }, { "ans": [ "02 N1 signals go to the EEC and 01 signal goes to the EMU for engine vibration analysis and engine trend monitoring. ", "false" ] } ], "ref": "Reference: Page 96,100/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "N2 speed sensor is located(A, B1, B2)", "ansGr": [ { "ans": [ "On the aft face of the AGB. ", "false" ] }, { "ans": [ "On the forward face of the AGB. ", "true" ] }, { "ans": [ "On the fan hub frame. ", "false" ] } ], "ref": "Reference: Page 100/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "08 T48 EGT probes are numbered 1 thru 8(A, B1, B2)", "ansGr": [ { "ans": [ "From the top in a clockwise direction. ", "true" ] }, { "ans": [ "From the bottom in a clockwise direction. ", "false" ] }, { "ans": [ "From the top in a counter-clockwise direction. ", "false" ] } ], "ref": "Reference: Page 108/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "title": "ATA 78: EXHAUST", "ch": "To open Thrust reverser cowl, which latch is to be opened first? (A, B1, B2)", "ansGr": [ { "ans": [ "V-blade latch. ", "false" ] }, { "ans": [ "Sleeve latches. ", "false" ] }, { "ans": [ "Bifurcation latch system (BLS) handle. ", "true" ] } ], "ref": "Reference: Page 312/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "How many hold-open rods are there on thrust reverser cowl? (A, B1, B2)", "ansGr": [ { "ans": [ "01. ", "true" ] }, { "ans": [ "02. ", "false" ] }, { "ans": [ "03. ", "false" ] } ], "ref": "Reference: Page 320/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The purpose of the chevrons on the outer panel of the translating sleeve is(A, B1, B2)", "ansGr": [ { "ans": [ "To increase thrust. ", "false" ] }, { "ans": [ "To decrease engine noise. ", "true" ] }, { "ans": [ "To reduce weight. ", "false" ] } ], "ref": "Reference: Page 328/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "Which of the following is NOT true: (A, B1, B2)", "ansGr": [ { "ans": [ "There 16 composite structure cascade segments for each T/R half. ", "true" ] }, { "ans": [ "Each segment has a number to identify its correct location on the engine. ", "false" ] }, { "ans": [ "The inboard segments have a shape that directs the reverse thrust airflow away from the fuselage. ", "false" ] } ], "ref": "Reference: Page 336/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "There is one track lock mechanism for each T/R assembly, it is in the: (A, B1, B2)", "ansGr": [ { "ans": [ "LH T/R upper hinge beam area of the engine strut. ", "false" ] }, { "ans": [ "RH T/R upper hinge beam area of the engine strut. ", "true" ] }, { "ans": [ "RH T/R torque box next to the V-blade latch. ", "false" ] } ], "ref": "Reference: Page 348/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The thrust reverser (T/R) T-piece: (A, B1, B2)", "ansGr": [ { "ans": [ "Connects the T/R sync shafts and tubing to make sure the actuators move together. ", "true" ] }, { "ans": [ "Is there so that if an actuator fails, the sync shafts will deploy the T/R halves. ", "false" ] }, { "ans": [ "Let the LH and RH T/R translating sleeves move separately. ", "false" ] } ], "ref": "Reference: Page 352/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "title": "ATA 79: ENGINE OIL", "ch": "The oil tank is located on the(A, B1, B2)", "ansGr": [ { "ans": [ "RH side of the fan case. ", "true" ] }, { "ans": [ "LH side of the fan case. ", "false" ] }, { "ans": [ "LH side of the compressor stator. ", "false" ] } ], "ref": "Reference: Page 14/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The pressure lubrication and scavenge pumps are gerotor type, positive displacement pumps and are(A, B1, B2)", "ansGr": [ { "ans": [ "Located on the RH side of the engine. ", "false" ] }, { "ans": [ "In separate oil pump packs. ", "false" ] }, { "ans": [ "In the same oil pump pack. ", "true" ] } ], "ref": "Reference: Page 26/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "Engine oil is cooled in(A, B1, B2)", "ansGr": [ { "ans": [ "Main Fuel/Oil Heat Exchanger (MFOHE) and Air Cool Oil Cooler (ACOC). ", "true" ] }, { "ans": [ "MFOHE and Fuel Servo Heat Exchanger. ", "false" ] }, { "ans": [ "ACOC and Fuel Servo Heat Exchanger. ", "false" ] } ], "ref": "Reference: Page 38/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The Air Cool Oil Cooler (ACOC) is a finned-tube design heat exchanger that transfers heat from the oil to the bypass (fan exit) airflow. It is located: (A, B1, B2)", "ansGr": [ { "ans": [ "On the RH side of fan case. ", "false" ] }, { "ans": [ "On the inside of the fan case, aft of the outlet guide vanes (OGV) from the 12:00 to the 3:00 position. ", "true" ] }, { "ans": [ "On the outside of the fan case, aft of the outlet guide vanes (OGV). ", "false" ] } ], "ref": "Reference: Page 38/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The purpose of Oil Eductor valve is: (A, B1, B2)", "ansGr": [ { "ans": [ "To increase the bearing chamber pressure to prevent possible oil leakage across the labyrinth seal at low engine power settings. ", "false" ] }, { "ans": [ "To act like a venturi to decrease the bearing chamber pressure to prevent possible oil leakage across the carbon seal at low engine power settings. ", "false" ] }, { "ans": [ "To act like a venturi to decrease the bearing chamber pressure to prevent possible oil leakage across the labyrinth seal at low engine power settings. ", "true" ] } ], "ref": "Reference: Page 50/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "ch": "The oil temperature shown on EICAS gets its temperature from(A, B1, B2)", "ansGr": [ { "ans": [ "Oil Level/Temperature Sensor in the top of the oil tank ", "true" ] }, { "ans": [ "Oil Supply Temperature Sensor on the outside of the fan case. ", "false" ] }, { "ans": [ "Oil Temperature Sensor in the oil pressure oil feed pipe after the coolers. ", "false" ] } ], "ref": "Reference: Page 66,70/413 of 4C Engine - Oil, Indicating, Air, Ignition/Starting, Exhaust and Balancing – Power plant Book 3 of 3, 787 Training Lab Notebook" }, { "part": "RR TRENT 1000 CAT B2", "title": "ATA 70 – Standard Practices", "ch": "What safety precaution must be taken before performing an engine boroscope inspection?", "ansGr": [ { "ans": [ "Disconnect the aircraft battery only ", "false" ] }, { "ans": [ "Pull the engine fire handle and disconnect EEC connectors ", "true" ] }, { "ans": [ "Drain the engine oil ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 70-00 – B787 RR Trent 1000 Training Material\nExplanation: Isolating the EEC and pulling the fire handle ensures the engine cannot receive power or fuel during inspection, eliminating ignition risk." }, { "ch": "What is the proper method for cleaning electrical engine connectors?", "ansGr": [ { "ans": [ "Use abrasive pads and water ", "false" ] }, { "ans": [ "Use approved solvent and lint-free cloth ", "true" ] }, { "ans": [ "High-pressure air and fuel ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 70-00 – B787 RR Trent 1000 Training Material\nExplanation: Cleaning sensitive engine connectors requires approved cleaning agents and methods to avoid contamination or damage to the contact surfaces." }, { "ch": "What must be done when replacing engine electrical connectors in the pylon area?", "ansGr": [ { "ans": [ "Use high-pressure air to clean them ", "false" ] }, { "ans": [ "Replace with standard AMP connectors ", "false" ] }, { "ans": [ "Match connector part number and ensure environmental seal ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 70-00 – B787 RR Trent 1000 Training Material\nExplanation: Environmental sealing and correct part matching are crucial for maintaining system integrity and avoiding electrical faults." }, { "ch": "What is the purpose of using torque seal on engine fasteners?", "ansGr": [ { "ans": [ "Prevent vibration ", "false" ] }, { "ans": [ "Visually indicate loosening ", "true" ] }, { "ans": [ "Increase torque resistance ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 70-00 – B787 RR Trent 1000 Training Material\nExplanation: Torque seal is applied to indicate if a fastener has moved, helping identify loosening due to vibration or thermal expansion." }, { "ch": "What reference should be used for material compatibility during engine repairs?", "ansGr": [ { "ans": [ "APU maintenance manual ", "false" ] }, { "ans": [ "SRM only ", "false" ] }, { "ans": [ "Aircraft standard practices manual and AMM ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 70-00 – B787 RR Trent 1000 Training Material\nExplanation: To avoid corrosion or improper bonding, always refer to the AMM and Standard Practices Manual for approved materials and procedures." }, { "title": "ATA 71 – Powerplant", "ch": "What must be done before removing the fan cowl on the Trent 1000 engine?", "ansGr": [ { "ans": [ "Disconnect IDG electrical connector ", "false" ] }, { "ans": [ "Pull fire switch and secure the cowl doors ", "false" ] }, { "ans": [ "Shut down the engine and install mechanical locks ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 71-10 – B787 RR Trent 1000 Training Material\nExplanation: Fan cowls are heavy and can close under gravity or wind. Proper support and engine shutdown are essential to prevent injury." }, { "ch": "What precaution is required before removing engine mounting bolts?", "ansGr": [ { "ans": [ "Disconnect EICAS power ", "false" ] }, { "ans": [ "Support the engine with a hoist or cradle ", "true" ] }, { "ans": [ "Deflate the nose gear strut ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 71-20 – B787 RR Trent 1000 Training Material\nExplanation: Supporting the engine before removing mounting bolts is critical to avoid structural stress or uncontrolled engine movement." }, { "ch": "What is a critical alignment requirement during Trent 1000 engine installation?", "ansGr": [ { "ans": [ "Connecting oil filler line first ", "false" ] }, { "ans": [ "Fan blade shroud contact ", "false" ] }, { "ans": [ "Engine-to-pylon interface pin engagement ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 71-20 – B787 RR Trent 1000 Training Material\nExplanation: Proper pin engagement ensures the engine is correctly aligned and secured to the pylon for safe operation." }, { "ch": "When the thrust reverser cowl is opened, what must be verified before performing maintenance?", "ansGr": [ { "ans": [ "That fire loop A is deactivated ", "false" ] }, { "ans": [ "That T/R actuator locks are installed ", "true" ] }, { "ans": [ "That EEC power is on ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 71-21 – B787 RR Trent 1000 Training Material\nExplanation: Actuator locks prevent uncommanded T/R movement during maintenance, avoiding injury or damage." }, { "ch": "What system confirms engine mounting bolt torque values after installation?", "ansGr": [ { "ans": [ "Central Maintenance Computer (CMC) ", "false" ] }, { "ans": [ "Manual verification with calibrated torque wrench ", "true" ] }, { "ans": [ "FADEC ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 71-20 – B787 RR Trent 1000 Training Material\nExplanation: Torque values are verified manually using calibrated tools and compared against AMM specifications. No automatic system tracks these values." }, { "title": "ATA 72 – Engine", "ch": "What is the function of the Variable Stator Vane (VSV) system in the Trent 1000 engine?", "ansGr": [ { "ans": [ "To increase oil flow to bearings ", "false" ] }, { "ans": [ "To control airflow into the HP compressor ", "true" ] }, { "ans": [ "To maintain N1 speed ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 72-31 – B787 RR Trent 1000 Training Material\nExplanation: VSVs regulate airflow angle into the HP compressor for optimal performance and stall margin during varying engine speeds." }, { "ch": "What drives the HP compressor in the Trent 1000 engine?", "ansGr": [ { "ans": [ "N1 fan ", "false" ] }, { "ans": [ "Intermediate turbine ", "false" ] }, { "ans": [ "HP turbine ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 72-31 – B787 RR Trent 1000 Training Material\nExplanation: The HP turbine is mechanically connected to the HP compressor, forming the HP spool (N2)." }, { "ch": "Which part of the engine houses the combustor module?", "ansGr": [ { "ans": [ "Fan case ", "false" ] }, { "ans": [ "Core module ", "true" ] }, { "ans": [ "Turbine rear frame ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 72-40 – B787 RR Trent 1000 Training Material\nExplanation: The combustor is part of the engine core and is located between the HP compressor and HP turbine." }, { "ch": "What precaution must be taken before removing an engine core module?", "ansGr": [ { "ans": [ "Drain the hydraulic reservoir ", "false" ] }, { "ans": [ "Secure the engine mount bolts ", "false" ] }, { "ans": [ "Align and lock rotors to prevent internal damage ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 72-00 – B787 RR Trent 1000 Training Material\nExplanation: Improper handling of rotor alignment can result in interference, damage to blades, or imbalance." }, { "ch": "What tool is used to verify blade tip clearance in the fan module?", "ansGr": [ { "ans": [ "Feeler gauge ", "false" ] }, { "ans": [ "Laser gap tool ", "true" ] }, { "ans": [ "Dial indicator ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 72-21 – B787 RR Trent 1000 Training Material\nExplanation: Blade tip clearance is precisely measured using a laser tool to ensure fan blade operation within tolerance." }, { "ch": "What engine component provides mounting support for the fan case and gearbox?", "ansGr": [ { "ans": [ "Fan stator frame ", "true" ] }, { "ans": [ "Engine rear mount ", "false" ] }, { "ans": [ "Low pressure turbine shaft ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 72-00 – B787 RR Trent 1000 Training Material\nExplanation: The fan stator frame supports the fan module and accessory gearboxes, forming a structural core section." }, { "ch": "How is the Low Pressure Turbine (LPT) cooled?", "ansGr": [ { "ans": [ "By bypass air through radial slots ", "false" ] }, { "ans": [ "With fuel/oil cooling system ", "false" ] }, { "ans": [ "Through compressor bleed air ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 72-52 – B787 RR Trent 1000 Training Material\nExplanation: Compressor bleed air is routed internally to cool the LPT to prevent overheating and material degradation." }, { "ch": "What is used to prevent oil leakage along rotating engine shafts?", "ansGr": [ { "ans": [ "Fuel seal ", "false" ] }, { "ans": [ "Labyrinth seal with pressurized air ", "true" ] }, { "ans": [ "RTV sealant ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 72-00 – B787 RR Trent 1000 Training Material\nExplanation: Labyrinth seals combined with pressurized air form a non-contact barrier to keep oil within bearing compartments." }, { "ch": "What condition requires an in-depth engine vibration inspection?", "ansGr": [ { "ans": [ "Engine stall during start ", "false" ] }, { "ans": [ "Increase in oil pressure ", "false" ] }, { "ans": [ "High N1 vibration on EICAS ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 72-00 – B787 RR Trent 1000 Training Material\nExplanation: High N1 vibration readings may indicate fan imbalance, damaged blades, or bearing faults requiring further investigation." }, { "ch": "During fan blade replacement, what is critical for balance?", "ansGr": [ { "ans": [ "Replace only with fan tip cap ", "false" ] }, { "ans": [ "Match the blade's moment weight ", "true" ] }, { "ans": [ "Clean the blade root thoroughly ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 72-21 – B787 RR Trent 1000 Training Material\nExplanation: Fan blade sets are weight-matched to maintain balance. Replacing one requires using a blade with the same moment weight." }, { "title": "ATA 73 – Engine Fuel and Control", "ch": "What component regulates the fuel flow to the engine?", "ansGr": [ { "ans": [ "Fuel spar valve ", "false" ] }, { "ans": [ "Fuel metering unit in the FMU ", "true" ] }, { "ans": [ "Fuel filter bypass valve ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 73-20 – B787 RR Trent 1000 Training Material\nExplanation: The Fuel Metering Unit is part of the FMU and precisely meters fuel flow to the injectors under EEC control." }, { "ch": "What is the purpose of the LP fuel pump?", "ansGr": [ { "ans": [ "Send fuel to the APU ", "false" ] }, { "ans": [ "Supply suction for hydraulic reservoir ", "false" ] }, { "ans": [ "Boost pressure to HP fuel pump ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 73-10 – B787 RR Trent 1000 Training Material\nExplanation: The LP pump increases pressure to feed the HP pump, ensuring uninterrupted fuel flow during engine operation." }, { "ch": "What happens if the HP fuel pump bypass valve opens?", "ansGr": [ { "ans": [ "Fuel bypasses to the LP pump ", "true" ] }, { "ans": [ "Fuel stops flowing ", "false" ] }, { "ans": [ "Fuel is vented overboard ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 73-20 – B787 RR Trent 1000 Training Material\nExplanation: The HP bypass valve prevents overpressure by routing excess fuel back to the LP side of the system." }, { "ch": "How is the fuel spar valve actuated?", "ansGr": [ { "ans": [ "Electrically by EEC ", "true" ] }, { "ans": [ "Pneumatically ", "false" ] }, { "ans": [ "Manually via override lever ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 73-21 – B787 RR Trent 1000 Training Material\nExplanation: The EEC controls the fuel spar valve electrically, allowing remote shutoff of fuel supply during fire or shutdown conditions." }, { "ch": "Where is the fuel filter located in the Trent 1000 engine?", "ansGr": [ { "ans": [ "In the wing tank ", "false" ] }, { "ans": [ "After the LP pump ", "false" ] }, { "ans": [ "Between HP pump and FMU ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 73-10 – B787 RR Trent 1000 Training Material\nExplanation: The fuel filter is installed upstream of the FMU to catch contaminants before they reach precision metering components." }, { "ch": "What EICAS message appears for a fuel filter bypass condition?", "ansGr": [ { "ans": [ "ENG FUEL LOW ", "false" ] }, { "ans": [ "ENG FUEL LEAK ", "false" ] }, { "ans": [ "ENG FUEL FILT BYPASS ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 73-10 – B787 RR Trent 1000 Training Material\nExplanation: If the fuel filter bypasses due to clogging, the EEC triggers an advisory or warning via AIMS/EICAS." }, { "ch": "What sensor monitors fuel temperature at the engine?", "ansGr": [ { "ans": [ "EEC OAT sensor ", "false" ] }, { "ans": [ "Engine fuel temp sensor in FMU ", "true" ] }, { "ans": [ "TAT probe ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 73-10 – B787 RR Trent 1000 Training Material\nExplanation: The engine-mounted fuel temperature sensor provides input to the EEC for fuel scheduling and performance monitoring." }, { "ch": "Why is pressurization of the fuel system important in flight?", "ansGr": [ { "ans": [ "To reduce EGT ", "false" ] }, { "ans": [ "To prevent cavitation and vapor lock ", "true" ] }, { "ans": [ "To provide fuel to hydraulics ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 73-10 – B787 RR Trent 1000 Training Material\nExplanation: Maintaining fuel pressure prevents vapor bubbles from forming in pumps and injectors, ensuring smooth combustion." }, { "ch": "What is the function of the FMU drain valve?", "ansGr": [ { "ans": [ "To offload excess fuel to the APU ", "false" ] }, { "ans": [ "To manually test for fuel presence ", "false" ] }, { "ans": [ "To drain fuel during maintenance or shutdown ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 73-20 – B787 RR Trent 1000 Training Material\nExplanation: The FMU has a drain feature to release fuel trapped during shutdown or when servicing the system." }, { "ch": "How does the EEC control fuel flow during start-up?", "ansGr": [ { "ans": [ "By adjusting HP pump speed ", "false" ] }, { "ans": [ "By modulating FMU metering valve ", "true" ] }, { "ans": [ "By increasing N1 ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 73-20 – B787 RR Trent 1000 Training Material\nExplanation: The EEC commands the FMU metering valve to deliver the required amount of fuel based on N2 speed and start conditions." }, { "title": "ATA 74 – Ignition", "ch": "What controls the ignition system during engine start?", "ansGr": [ { "ans": [ "FADEC backup ", "false" ] }, { "ans": [ "APU controller ", "false" ] }, { "ans": [ "EEC ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: The Electronic Engine Control (EEC) automatically controls ignition timing, duration, and selection during start sequences." }, { "ch": "How many igniters are used in the Trent 1000 engine?", "ansGr": [ { "ans": [ "One per combustor section ", "false" ] }, { "ans": [ "Two per engine ", "true" ] }, { "ans": [ "One shared between engines ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: Each engine is equipped with two igniters (A and B), one in each ignitor plug hole of the combustion chamber." }, { "ch": "What happens if one igniter fails during engine start?", "ansGr": [ { "ans": [ "The EEC aborts the start ", "false" ] }, { "ans": [ "The remaining igniter continues operation ", "true" ] }, { "ans": [ "APU ignition system is used ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: The system is designed to operate with a single igniter in the event of a failure to complete the start." }, { "ch": "Where is the ignition exciter located?", "ansGr": [ { "ans": [ "Inside the EEC ", "false" ] }, { "ans": [ "Mounted on the fan stator frame ", "true" ] }, { "ans": [ "Integrated with the fuel metering unit ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: The exciter boxes are mounted on the fan stator frame and supply high voltage to the igniter plugs." }, { "ch": "What mode does the ignition system use during in-flight relight?", "ansGr": [ { "ans": [ "Continuous ignition ", "true" ] }, { "ans": [ "Ground-start mode ", "false" ] }, { "ans": [ "Auto-spark suppression ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: During in-flight relight or flameout recovery, the system enables continuous ignition to support combustion re-establishment." }, { "ch": "How is the igniter plug connected to the exciter?", "ansGr": [ { "ans": [ "Coaxial ignition lead ", "true" ] }, { "ans": [ "Copper tube ", "false" ] }, { "ans": [ "Fiber-optic cable ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: The igniter plug receives high-voltage pulses via a shielded coaxial cable from the exciter." }, { "ch": "What controls the duration of ignition in automatic mode?", "ansGr": [ { "ans": [ "Ignition switch on pedestal ", "false" ] }, { "ans": [ "EICAS message logic ", "false" ] }, { "ans": [ "EEC based on N2 and EGT ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: The EEC determines when to terminate ignition based on successful light-off and rise in N2 and EGT values." }, { "ch": "When is ignition automatically turned on during flight?", "ansGr": [ { "ans": [ "At top of descent ", "false" ] }, { "ans": [ "When EGT drops ", "false" ] }, { "ans": [ "During flameout detection or severe turbulence ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: The EEC activates ignition automatically under certain abnormal conditions like flameout or severe turbulence." }, { "ch": "What maintenance action is required if both igniters are inoperative?", "ansGr": [ { "ans": [ "Replace the EEC ", "false" ] }, { "ans": [ "Replace the ignition relay ", "false" ] }, { "ans": [ "Troubleshoot exciter and igniter plugs ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: If both igniters fail, start by verifying output at the exciter and checking continuity and insulation of the plugs and leads." }, { "ch": "What precaution must be taken when handling igniter plugs?", "ansGr": [ { "ans": [ "Immerse in oil ", "false" ] }, { "ans": [ "Do not touch electrodes or insulation ", "true" ] }, { "ans": [ "Clean with steel brush ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 74-11 – B787 RR Trent 1000 Training Material\nExplanation: Igniter plugs are sensitive to damage or contamination; contact with the tip can degrade insulation and spark quality." }, { "title": "ATA 75 – Air System", "ch": "What is the function of the customer bleed valve (CBV)?", "ansGr": [ { "ans": [ "Controls airflow to turbine ", "false" ] }, { "ans": [ "Diverts bleed air to cabin systems ", "true" ] }, { "ans": [ "Maintains fuel pressure ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-20 – B787 RR Trent 1000 Training Material\nExplanation: The CBV manages the delivery of high-pressure bleed air from the engine to aircraft systems such as ECS and anti-ice." }, { "ch": "Where is engine bleed air tapped from in the Trent 1000?", "ansGr": [ { "ans": [ "LPC only ", "false" ] }, { "ans": [ "IPC and HPC stages ", "true" ] }, { "ans": [ "LPT exit ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-20 – B787 RR Trent 1000 Training Material\nExplanation: Bleed air is drawn from both intermediate and high pressure compressor stages depending on power setting and demand." }, { "ch": "How is the HP check valve in the bleed system controlled?", "ansGr": [ { "ans": [ "By EICAS switches ", "false" ] }, { "ans": [ "It is a passive non-return valve ", "true" ] }, { "ans": [ "EEC sends electrical signals ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-20 – B787 RR Trent 1000 Training Material\nExplanation: The HP check valve is a passive component that prevents reverse flow when high pressure air is not required." }, { "ch": "What condition causes the high-stage valve to open?", "ansGr": [ { "ans": [ "High EGT ", "false" ] }, { "ans": [ "Low air demand ", "false" ] }, { "ans": [ "Low intermediate pressure ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: If IP pressure is insufficient to meet system demand, the high-stage valve opens to supply air from the high-pressure stage." }, { "ch": "What controls the operation of bleed air valves?", "ansGr": [ { "ans": [ "EICAS logic ", "false" ] }, { "ans": [ "The AIMS system ", "false" ] }, { "ans": [ "EEC based on demand and pressure sensors ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: The EEC monitors pressure and temperature data and commands valve actuation to regulate airflow and prevent overpressure." }, { "ch": "What safety device protects the bleed manifold from overpressure?", "ansGr": [ { "ans": [ "Fire loop ", "false" ] }, { "ans": [ "Pressure regulating shutoff valve ", "false" ] }, { "ans": [ "Overpressure relief valve ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: If bleed pressure exceeds limits, the overpressure relief valve opens to vent excess air and protect downstream systems." }, { "ch": "What happens if the bleed air temperature becomes excessive?", "ansGr": [ { "ans": [ "CBV closes and EICAS alerts the crew ", "true" ] }, { "ans": [ "Fan speed increases ", "false" ] }, { "ans": [ "Engine automatically reduces thrust ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: Over-temperature protection is built-in; the CBV will close to prevent further heating and signal is sent to EICAS." }, { "ch": "What component separates customer air and turbine cooling air?", "ansGr": [ { "ans": [ "Intercooler ", "false" ] }, { "ans": [ "Pre-cooler heat exchanger ", "true" ] }, { "ans": [ "Air separation valve ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-22 – B787 RR Trent 1000 Training Material\nExplanation: The pre-cooler moderates the temperature of bleed air before it’s routed to the ECS or used for turbine cooling." }, { "ch": "What must be verified before performing maintenance on the bleed air duct?", "ansGr": [ { "ans": [ "EEC is powered ", "false" ] }, { "ans": [ "That the duct is cooled down and depressurized ", "true" ] }, { "ans": [ "N1 is above idle ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: Hot pressurized air poses burn and rupture hazards. Always ensure the duct is cooled and depressurized before removal." }, { "ch": "What is the source of cooling air for the engine oil cooler?", "ansGr": [ { "ans": [ "LP turbine bypass air ", "true" ] }, { "ans": [ "Fuel system ", "false" ] }, { "ans": [ "Engine bleed air ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 75-22 – B787 RR Trent 1000 Training Material\nExplanation: Bypass air is used to cool the oil via a heat exchanger mounted on the fan case." }, { "ch": "What does an ENG BLEED OFF EICAS message typically indicate?", "ansGr": [ { "ans": [ "EEC has lost thrust control ", "false" ] }, { "ans": [ "CBV is closed ", "true" ] }, { "ans": [ "TAT probe has failed ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: The message is shown when the bleed air is no longer supplied due to CBV closure, either commanded or fault-induced." }, { "ch": "What type of sensor is used to monitor bleed air temperature?", "ansGr": [ { "ans": [ "Thermocouple ", "false" ] }, { "ans": [ "RTD (Resistance Temperature Device) ", "true" ] }, { "ans": [ "Pressure transducer ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-22 – B787 RR Trent 1000 Training Material\nExplanation: RTDs provide accurate temperature readings over a wide range and are commonly used in bleed air duct monitoring." }, { "ch": "What condition requires manual isolation of the bleed system?", "ansGr": [ { "ans": [ "APU not available ", "false" ] }, { "ans": [ "Engine fire or leak ", "true" ] }, { "ans": [ "In-flight icing ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-21 – B787 RR Trent 1000 Training Material\nExplanation: Bleed valves must be manually shut in the event of engine fire, bleed leak, or overheat to contain hazards." }, { "ch": "Where is turbine cooling air routed after use?", "ansGr": [ { "ans": [ "Overboard through fan duct ", "true" ] }, { "ans": [ "Back to bleed manifold ", "false" ] }, { "ans": [ "Into the exhaust mixer ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 75-22 – B787 RR Trent 1000 Training Material\nExplanation: After cooling turbine components, the air is exhausted through the fan duct, preventing heat accumulation." }, { "ch": "What controls cooling air flow to turbine disks?", "ansGr": [ { "ans": [ "Mechanical valve ", "false" ] }, { "ans": [ "EEC-controlled modulating valve ", "true" ] }, { "ans": [ "Cabin pressure system ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 75-22 – B787 RR Trent 1000 Training Material\nExplanation: The EEC uses modulating valves to control cooling air flow based on engine temperature and N2 speed." }, { "title": "ATA 76 – Engine Controls", "ch": "What is the primary function of the EEC in the Trent 1000?", "ansGr": [ { "ans": [ "Display N1 speed on the flight deck ", "false" ] }, { "ans": [ "Control thrust and manage engine parameters ", "true" ] }, { "ans": [ "Provide bleed air modulation ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: The EEC (Electronic Engine Controller) manages fuel flow, variable stator vanes, and thrust settings, ensuring safe and efficient engine operation." }, { "ch": "What power source normally supplies the EEC?", "ansGr": [ { "ans": [ "Aircraft battery ", "false" ] }, { "ans": [ "PMA (Permanent Magnet Alternator) ", "true" ] }, { "ans": [ "Generator control unit ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: Each EEC is powered by its dedicated PMA during normal engine operation; aircraft power is used only during start-up." }, { "ch": "Which control mode allows full EEC authority?", "ansGr": [ { "ans": [ "Soft reversionary mode ", "false" ] }, { "ans": [ "Hard manual mode ", "false" ] }, { "ans": [ "Normal mode ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: In normal mode, the EEC uses full input from sensors and FADEC logic to control engine parameters." }, { "ch": "What happens if the EEC loses its airframe data inputs?", "ansGr": [ { "ans": [ "It shuts down the engine ", "false" ] }, { "ans": [ "Switches to alternate mode ", "true" ] }, { "ans": [ "Maintains idle only ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: In the event of sensor input loss or signal fault, the EEC enters an alternate mode using internal schedules." }, { "ch": "What does the thrust lever angle (TLA) sensor provide to the EEC?", "ansGr": [ { "ans": [ "EGT limit ", "false" ] }, { "ans": [ "Thrust demand position ", "true" ] }, { "ans": [ "N2 overspeed protection ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: TLA sensors indicate pilot demand to the EEC, allowing it to calculate fuel flow and engine parameters accordingly." }, { "ch": "How are the engine control inputs transmitted to the EEC on B787?", "ansGr": [ { "ans": [ "Mechanically via cables ", "false" ] }, { "ans": [ "Through servo hydraulic links ", "false" ] }, { "ans": [ "Electrically via AIMS and throttle quadrant unit ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: The fly-by-wire throttle system transmits electrical signals from the AIMS to the EECs for thrust control." }, { "ch": "What controls the VSV (Variable Stator Vanes) and VBV (Variable Bleed Valves)?", "ansGr": [ { "ans": [ "AIMS ", "false" ] }, { "ans": [ "EEC ", "true" ] }, { "ans": [ "Hydraulic actuator ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 76-21 – B787 RR Trent 1000 Training Material\nExplanation: The EEC controls both VSV and VBV positions to optimize airflow through the engine." }, { "ch": "What component interfaces between the flight deck and engine control system?", "ansGr": [ { "ans": [ "Throttle quadrant unit (TQU) ", "true" ] }, { "ans": [ "FADEC relay ", "false" ] }, { "ans": [ "Generator control panel ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: The TQU sends electrical signals corresponding to throttle lever position to the EEC." }, { "ch": "Which mode does the EEC enter if PMA power is lost?", "ansGr": [ { "ans": [ "Alternate idle mode ", "false" ] }, { "ans": [ "Aircraft power backup mode ", "true" ] }, { "ans": [ "Limp-home mode ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: If the PMA fails, the EEC will revert to aircraft electrical power to maintain engine control." }, { "ch": "What protects the engine against N1 overspeed?", "ansGr": [ { "ans": [ "EEC software logic ", "true" ] }, { "ans": [ "Mechanical governor ", "false" ] }, { "ans": [ "Fuel spar valve ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: The EEC monitors N1 RPM and modulates fuel flow to prevent the fan from exceeding its design limit." }, { "ch": "What happens to the engine if both EECs fail?", "ansGr": [ { "ans": [ "It reverts to manual control ", "false" ] }, { "ans": [ "The engine flames out ", "false" ] }, { "ans": [ "It maintains last commanded thrust ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: A dual EEC failure causes the engine to freeze at its last commanded setting until shut down." }, { "ch": "How does the EEC prevent surge and stall during transients?", "ansGr": [ { "ans": [ "Opens the VSVs fully ", "false" ] }, { "ans": [ "Reduces fuel flow ", "false" ] }, { "ans": [ "Coordinates VBV and VSV operation with fuel metering ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 76-21 – B787 RR Trent 1000 Training Material\nExplanation: By adjusting airflow and fuel flow simultaneously, the EEC maintains stable compressor operation." }, { "ch": "What type of signals are used between AIMS and EEC?", "ansGr": [ { "ans": [ "Analog ", "false" ] }, { "ans": [ "Mechanical feedback ", "false" ] }, { "ans": [ "Digital ARINC 664 (AFDX) signals ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 76-11 – B787 RR Trent 1000 Training Material\nExplanation: The B787 uses AFDX (Avionics Full Duplex Switched Ethernet) for data transmission between systems like AIMS and EECs." }, { "title": "ATA 77 – Engine Indicating and Recording", "ch": "What system collects engine performance data for trending on the B787?", "ansGr": [ { "ans": [ "ACARS ", "false" ] }, { "ans": [ "AIMS with Quick Access Recorder (QAR) ", "true" ] }, { "ans": [ "Central Maintenance Computer (CMC) ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-00 – B787 RR Trent 1000 Training Material\nExplanation: AIMS transmits performance data to the QAR for maintenance trend monitoring and post-flight analysis." }, { "ch": "Where are engine vibration readings displayed?", "ansGr": [ { "ans": [ "Circuit breaker panel ", "false" ] }, { "ans": [ "EICAS display ", "true" ] }, { "ans": [ "Engine panel in cargo bay ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-11 – B787 RR Trent 1000 Training Material\nExplanation: Vibration levels are monitored by the EEC and displayed to the crew via the EICAS system." }, { "ch": "What sensors provide engine vibration data?", "ansGr": [ { "ans": [ "TAT sensors ", "false" ] }, { "ans": [ "Proximity probes on the fan case ", "false" ] }, { "ans": [ "Accelerometers on the engine bearing supports ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 77-11 – B787 RR Trent 1000 Training Material\nExplanation: Accelerometers mounted near engine bearings detect abnormal vibration levels in the rotating assemblies." }, { "ch": "What system enables post-flight engine maintenance download?", "ansGr": [ { "ans": [ "Dataload system ", "false" ] }, { "ans": [ "ACARS ", "false" ] }, { "ans": [ "Maintenance Access Terminal (MAT) ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C - Ref: ATA 77-00 – B787 RR Trent 1000 Training Material\nExplanation: The MAT connects to the AIMS to download recorded engine data for diagnostic purposes." }, { "ch": "How is EGT (Exhaust Gas Temperature) measured?", "ansGr": [ { "ans": [ "Using dual thermocouples in fan duct ", "false" ] }, { "ans": [ "Multiple thermocouples in turbine exhaust ", "true" ] }, { "ans": [ "Computed from N2 speed ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-20 – B787 RR Trent 1000 Training Material\nExplanation: Several thermocouples positioned around the turbine exhaust provide accurate EGT values to the EEC." }, { "ch": "What indicates an EGT exceedance on EICAS?", "ansGr": [ { "ans": [ "Amber “ENG OVHT” ", "false" ] }, { "ans": [ "Red “EGT LIMIT” ", "true" ] }, { "ans": [ "White “FUEL TEMP HIGH” ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-20 – B787 RR Trent 1000 Training Material\nExplanation: The EICAS alerts the crew to engine temperature exceedances with red EGT limit warnings." }, { "ch": "How is N1 calculated in the B787 Trent 1000?", "ansGr": [ { "ans": [ "Magnetic pickup on LP shaft ", "true" ] }, { "ans": [ "Computed from fan blade angle ", "false" ] }, { "ans": [ "Derived from fuel metering signal ", "false" ] } ], "ref": "Ref (CAT B1) Answer: A - Ref: ATA 77-11 – B787 RR Trent 1000 Training Material\nExplanation: N1 speed is measured by a magnetic sensor located on the LP rotor shaft." }, { "ch": "What condition may cause erratic engine parameter display?", "ansGr": [ { "ans": [ "VBV failure ", "false" ] }, { "ans": [ "EEC sensor fault ", "true" ] }, { "ans": [ "Fuel filter bypass ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-00 – B787 RR Trent 1000 Training Material\nExplanation: Sensor malfunctions feeding incorrect data to the EEC can result in erratic or invalid engine indications." }, { "ch": "Which component stores maintenance fault messages?", "ansGr": [ { "ans": [ "EEC ", "false" ] }, { "ans": [ "AIMS Maintenance Function ", "true" ] }, { "ans": [ "Data concentrator unit ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-00 – B787 RR Trent 1000 Training Material\nExplanation: AIMS maintains an internal maintenance log that records engine fault messages and performance events." }, { "ch": "How is oil pressure displayed to the flight crew?", "ansGr": [ { "ans": [ "On the center console gauge ", "false" ] }, { "ans": [ "As digital data on the EICAS ", "true" ] }, { "ans": [ "On the MAT screen ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-30 – B787 RR Trent 1000 Training Material\nExplanation: Engine oil pressure is digitally transmitted and shown on the EICAS display." }, { "ch": "What action is triggered if N2 overspeed is detected?", "ansGr": [ { "ans": [ "Engine shutdown ", "false" ] }, { "ans": [ "Fuel metering valve closure ", "true" ] }, { "ans": [ "No action unless EGT is also high ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-11 – B787 RR Trent 1000 Training Material\nExplanation: If the EEC detects an N2 overspeed, it closes the metering valve to reduce fuel flow and lower RPM." }, { "ch": "What is the function of the Engine Condition Monitoring System (ECMS)?", "ansGr": [ { "ans": [ "Real-time fan blade vibration alerts ", "false" ] }, { "ans": [ "Collection and transmission of engine performance data ", "true" ] }, { "ans": [ "Displays oil temperature in degrees C ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B - Ref: ATA 77-00 – B787 RR Trent 1000 Training Material\nExplanation: ECMS monitors and logs engine performance data to aid in predictive maintenance and health trend analysis." }, { "title": "ATA 78 – Exhaust", "ch": "What is the primary function of the exhaust nozzle in the Trent 1000?", "ansGr": [ { "ans": [ "Reduce engine vibration ", "false" ] }, { "ans": [ "Convert thermal energy into thrust ", "true" ] }, { "ans": [ "Divert hot air to the nacelle ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B – Ref: ATA 78-00 – B787 RR Trent 1000 Training Material\nExplanation: The exhaust nozzle channels and accelerates exhaust gases to create thrust through momentum transfer." }, { "ch": "How is the exhaust system cooled during flight?", "ansGr": [ { "ans": [ "Fuel-cooled tubing ", "false" ] }, { "ans": [ "Ambient air through passive airflow ", "false" ] }, { "ans": [ "Fan bypass air ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C – Ref: ATA 78-10 – B787 RR Trent 1000 Training Material\nExplanation: Fan bypass air flows around the hot sections of the engine, including the exhaust, to prevent overheating." }, { "ch": "What is the purpose of the exhaust cone?", "ansGr": [ { "ans": [ "Reduces backpressure ", "false" ] }, { "ans": [ "Directs exhaust flow smoothly ", "true" ] }, { "ans": [ "Supports the LPT shaft ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B – Ref: ATA 78-00 – B787 RR Trent 1000 Training Material\nExplanation: The exhaust cone smooths the gas flow path and minimizes turbulence, contributing to efficient engine operation." }, { "ch": "What component connects the core and fan exhaust flows?", "ansGr": [ { "ans": [ "Bypass duct ", "false" ] }, { "ans": [ "Mixer unit ", "true" ] }, { "ans": [ "HP compressor bleed port ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B – Ref: ATA 78-10 – B787 RR Trent 1000 Training Material\nExplanation: The mixer unit combines the cooler bypass air with the hotter core exhaust gases for noise and thrust efficiency." }, { "ch": "How is the exhaust nozzle attached to the engine?", "ansGr": [ { "ans": [ "Welded directly to the fan case ", "false" ] }, { "ans": [ "Bolted to the turbine rear frame ", "true" ] }, { "ans": [ "Integrated with the turbine blades ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B – Ref: ATA 78-10 – B787 RR Trent 1000 Training Material\nExplanation: The nozzle is secured to the turbine rear frame using bolts, enabling ease of removal during maintenance." }, { "ch": "What could high EGT with normal N1/N2 indicate related to the exhaust system?", "ansGr": [ { "ans": [ "Engine fire ", "false" ] }, { "ans": [ "Blocked or damaged exhaust nozzle ", "true" ] }, { "ans": [ "Low oil pressure ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B – Ref: ATA 78-00 – B787 RR Trent 1000 Training Material\nExplanation: A damaged or restricted nozzle could increase exhaust backpressure, leading to higher EGT." }, { "ch": "What material is commonly used for the exhaust nozzle?", "ansGr": [ { "ans": [ "Titanium alloy ", "false" ] }, { "ans": [ "Carbon fiber ", "false" ] }, { "ans": [ "Inconel or high-temperature nickel alloy ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C – Ref: ATA 78-10 – B787 RR Trent 1000 Training Material\nExplanation: High-temperature resistant alloys like Inconel are used in exhaust systems to withstand thermal and mechanical stress." }, { "ch": "What inspection method is used to check for cracks in the exhaust duct?", "ansGr": [ { "ans": [ "Ultrasonic inspection ", "false" ] }, { "ans": [ "Fluorescent penetrant inspection (FPI) ", "true" ] }, { "ans": [ "Radiographic imaging ", "false" ] } ], "ref": "Ref (CAT B1) Answer: B – Ref: ATA 78-00 – B787 RR Trent 1000 Training Material\nExplanation: FPI is commonly used for detecting surface cracks in high-temperature components like exhaust ducts." }, { "ch": "What component helps reduce noise in the exhaust flow?", "ansGr": [ { "ans": [ "Acoustic panel ", "false" ] }, { "ans": [ "Bypass valve ", "false" ] }, { "ans": [ "Exhaust mixer ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C – Ref: ATA 78-10 – B787 RR Trent 1000 Training Material\nExplanation: The exhaust mixer reduces engine noise by blending high-speed hot gas with cooler bypass air more gradually." }, { "ch": "Where is exhaust system damage likely to cause abnormal vibration?", "ansGr": [ { "ans": [ "Low pressure spool ", "false" ] }, { "ans": [ "Turbine rear frame ", "false" ] }, { "ans": [ "Exhaust cone or nozzle ", "true" ] } ], "ref": "Ref (CAT B1) Answer: C – Ref: ATA 78-00 – B787 RR Trent 1000 Training Material\nExplanation: Damage to the cone or nozzle may disrupt gas flow symmetry and balance, leading to detectable vibration." } ]