Ch.7 (Engines/APU) Flashcards
Engines/APU
Define N1
Low pressure compressor. 1 fan and a 3-stage booster
Define N2
High Pressure compressor. It has a 9 stage compressor and 4 stages of variable stator vanes which control compressor loading to prevent compressor stall
What are the start lever positions?
- IDLE: Ignition system energized via EEC, spar fuel SOV electrically opened, Engine fuel SOV opens
- CUTOFF: Spar and Engine Fuel SOV’s close, Ignition system de-energizes
What is required for selection of reverse thrust?
The forward thrust levers must be at IDLE
What fuel valve(s) close when an engine start lever is moved to CUTOFF?
Spar and Engine Fuel SOV’s
What component controls and monitors engine parameters?
The EEC (electronic engine control) which is a full-authority digital engine control (FADEC)
*The Electronic engine control (EEC) provides exceedance protection for which parameter(s) in
normal mode?
Structural Limit protection
In normal mode, what does the EEC use to calculate N1 thrust ratings?
Sensed flight conditions and bleed air
What are the possible EEC modes with the Engine EEC switch showing both the ON (white) and ALTN (amber) displays illuminated?
Soft Alternate Control mode and Hard alternate control mode when hard mode was selected by retarding the thrust to IDLE
Compare thrust in EEC HARD ALTERNATE Mode to normal mode for a given thrust lever position.
Hard Alternate control mode thrust is always equal to or greater than normal mode for the same thrust lever position.
What does an ENGINE CONTROL (amber) light mean?
The EEC has detected a fault in the Engine Control system that is not dispatchable.
Engine must be operating (N2 above 50%) and Aircraft on the ground
What mode is active with the Thrust Mode Display indicating R-TO (green)?
Reduced take off
What causes the ENG FAIL Alert (amber) on the EGT indicator?
Engine operating below a sustainable ide (50% N2) with the Engine start lever in the Idle
position
What removes the ENG FAIL Alert?
Engine recovery, Engine Start Lever to Cutoff, Fire switch pulled
On the ground, after engine shutdown, what does a red box on the EGT readout indicate?
An inflight exceedance of EGT has occurred
What does “reverse video” displayed on the Engine Vibration readout indicate?
The vibration has exceeded 4.0 unites
What should the ENG VALVE CLOSED lights (blue) and SPAR VALVE CLOSED lights (blue) indicate during a normal preflight, power on, Engines off?
Dim blue because they are closed until the Engine Start lever is moved to IDLE
What does an illuminated FILTER BYPASS light (amber) indicate?
An impending fuel filter bypass condition due to a contaminated filter. (EEC turns on the bypass light before the actual bypass occurs)
What is the indication if the engine oil pressure drops below redline during take off roll (<80kts)?
Nothing until 400’RA or 30 seconds after reaching 80KIAS (whichever occurs first). After that the Low oil pressure light will flash for 10 seconds then remain steady
What does the ignition switch in the IGN R position select?
The right ignitor is selected for both engines
In flight, what does the Engine Start Switch in CONT provide with the engine start lever in idle?
Ignition is provided to the selected ignitors
In flight, what does the engine start switch in FLT provide with the Engine Start Lever in IDLE?
Ignition is provided to both ignitors
What does a steady START VALVE OPEN (amber) light indicate?
The respective start valve is open and airflow is being provided to the starter
What does an amber REV indicate? Green REV?
- Amber: A reverser sleeve has moved out of the stowed position
- Green: Reverser has reached the deployed position
