Flashcards on Jet Engine and APU Systems
Jet Engine and APU Systems: A Comprehensive Guide for Students
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Aircraft Gas Turbine Engines
23 cards
Card 1
Question: What are two methods of relieving thermal stress on a turbine disk?
Answer: Bleed air and grooves that allow cooling air onto the face of the disk.
Card 2
Question: What may indicate a turbojet engine is out of trim during takeoff?
Answer: A high exhaust gas temperature (EGT) at the target engine pressure ratio (EPR).
Card 3
Question: What prevents burning of the combustion chamber liners?
Answer: Cooling air along the inside of the liner, often directed by louvers along the axial length of the liners.
Card 4
Question: Name one advantage of a turbofan over a turbojet.
Answer: Provides additional thrust without increasing fuel flow (more thrust same fuel flow).
Card 5
Question: What does trimming a turbojet engine mean?
Answer: Adjusting the fuel control to obtain the correct idling and maximum-thrust RPM.
Card 6
Question: Where are most APUs located in modern jet aircraft?
Answer: In the tail cone of the fuselage.
Card 7
Question: What is the primary function of an APU?
Answer: To provide electric power and compressed air when the main engines are not operating.
Card 8
Question: What are two sources of compressed air from an APU?
Answer: Bleed air from the APU turbine compressor, or compressed air from a load compressor driven by a free turbine.
Card 9
Question: How is most troubleshooting done for a modern APU?
Answer: By reading the fault codes generated by the FADEC.
Card 10
Question: What type of engine is an APU?
Answer: A turboshaft engine.