Engines and APU Flashcards
Define N1
Speed of low-pressure compressor
Define N2
Speed of high-pressure compressor
What are the start lever positions?
IDLE and CUTOFF
What is required for selection of reverse thrust?
Related forward thrust lever is at idle
What fuel valve(s) close when an engine Start Lever is moved to CUTOFF?
Associated engine and spar fuel valves
What component controls and monitors engine parameters?
Electronic Engine Control (EEC)
The Electronic Engine Control (EEC) provides exceedance protection for which
parameter(s) in normal mode?
N1 over-speed, N2 over-speed, and over-boost
In Normal Mode, what does the Electronic Engine Control (EEC) use to calculate N1
thrust ratings?
Sensed flight conditions and bleed air demand
What are the possible EEC modes with the Engine EEC switch showing both the ON
(white) and ALTN (amber) displays illuminated?
Soft or hard alternate
Compare thrust in EEC HARD ALTERNATE Mode to normal mode for a given thrust
lever position
Thrust is at least as high as commanded
What does an ENGINE CONTROL (amber) light mean?
Non-dispatchable engine fault
Light illuminated when:
Non-dispatchable fault exists, and
Engine is operating (N2 >= 50% and start lever IDLE), and
Aircraft on ground
What are the Thrust Mode Display annunciations?
TO - takeoff TO B - takeoff bump thrust R-TO - reduced takeoff CLB - climb R-CLB - reduced climb CRZ - cruise G/A - go around CON - continuous ----- FMC not computing thrust limit
What causes the ENG FAIL (amber) on the EGT indicator?
N2 < 50%
Start Lever - IDLE
What removes an ENG FAIL Alert (amber)?
Engine recovers, or
Start Lever - CUTOFF, or
Fire Switch Pulled
On the ground, after engine shutdown, what does a red box on the EGT Readout
indicate?
An in-flight EGT exceedance has occurred