Emergency Last Minute Flashcards
Basic principles of a hydromechanical fuel control
It’s driven by the gas generator gear train to sense engine speed and has no electronic interface assisting in computing or metering the fuel flow
How does a pressure type carburetor operate
Discharges fuel into the airstream at a pressure well above atmospheric
What is an impulse coupling and how does it work?
It’s connected between a magneto shaft and the drive gear inside of the engine. And it produces a hot and retarted spark
An impulse coupling is a spring loaded coupling between a magneto shaft and the drive gear inside the engine when the engine is rotated for starting the impulse coupling locks the magnet so it can’t turn. the spring in the coupling lines up as the crankshaft continues to turn, and when the piston is near top center the coupling where leases and spins the magnet producing a hot and retarded, spark
What is a shower of sparks ignition system?
An ignition system that uses an induction vibrator to produce a hot and retard spark for starting the engine
An ignition system that uses an induction vibrator to send pulsating DC into a set of retard breaker points on one of the magnetos. This provides a hot and retard spark for starting the engine
Where can an aircraft mechanic find the scope and details of the engine items that must be inspected during an annual or 100 hour inspection? 
14 CFR Part 43 appendix D
Who is responsible for maintaining an aircraft in an airworthy condition?
The owner or operator of the aircraft 
What regulations specify the inspections that must be accomplished on a general aircraft 
14 CFR part 91, Subpart E
Where are most APU’s located in modern jet transportation aircraft? 
In the tail cone or fuselage
What are two sources of compressed air from an APU? 
From bleed air from the APU turbine compressor or from a load compressor driven by a free turbine in the engine
**1. APU turbine compressor
2. Load compressor **
Where in maintenance information based on the ATA – 100 system would you find instructions for inspecting and servicing the engine of an airborne APU 
Section 49–20 
How is most of the troubleshooting done for a modern APU? 
By the fault codes generated by the FADEC
What ensures that an APU will not be shut down while it is too hot
An automatic time delay feature that closes the bleed air valve 
What prevents the APU exceeding its safe operating limits when the bleed air valve is wide open 
The FADEC monitors the load and regulates the fuel going into the APU
What manual do you use for replacing an igniter plug in an APU engine
Maintenance manual for the APU
What engine fault could cause a turbine engine to have high exhaust gas temperature low RPM and high fuel flow at all engine pressure ratio settings 
Possible turbine damage, and or loss of turbine efficiency due to excessive wear 
