Engines/Thrust Levers Flashcards
What controls the engines in all operating regimes?
FADECs (Full Authority Digital Engine Controls)
What functions does the FADEC control?
Fuel metering
Engine limits based on thrust lever angle
Start sequencing
Provides engine indications and thrust limit displays on the E/WD
What redundancy does the FADEC have?
Dual channel redundancy – one channel is active while the other is standby
What is the power source for the FADEC?
The system has its own alternator making it independent of the aircraft electrical system when N2 is above a set value If this alternator fails the FADEC automatically switches to aircraft electrical power
When will the FADEC abort a start?
Hot start
Stalled start
No ignition
If the FADEC detects a fault during automatic start, is any crew intervention required?
No. The FADEC will discontinue the start, clear the engine, and attempt a restart (if warranted) automatically
When does the FADEC command a higher engine idle speed?
Bleed demands
Approach Configuration
High engine or IDG temperatures
How many igniters fire on manual or in-flight starts?
Both A and B
When does continuous ignition automatically operate?
Engine flameout detection
Failure of the Engine Interface Unit (EIU)
What is the active range of the A/THR?
Just above IDLE to the CL detent (2 engines)
Just above IDLE to the MCT detent (1 engine)
What determines the maximum thrust the A/THR system will be able to command?
The position detent of the thrust lever
What are 3 ways to disconnect the A/THR?
Instinctive Disconnect buttons
Thrust Levers to IDLE
A/THR pushbutton
How do you disconnect the A/THR for the remainder of the flight?
Press and hold the Instinctive Disconnect Pushbutton for 15 seconds
What would you lose if you held down the Instinctive Disconnect Pushbutton for more than 15 seconds?
Alpha Floor Protection
What happens to thrust and what annunciates on the FMA when you reach Alpha Floor?
Thrust – TOGA
FMA – A.FLOOR
How do you regain normal A/THR when in TOGA LK or THR LK?
Move Thrust Levers to the TOGA detent
Press the Instinctive Disconnect button
Return Thrust Levers to CL detent
Push the A/THR pushbutton to engage A/THR
When is Alpha Floor Protection active?
From lift-off through 100 feet RA on approach
When would Thrust Lock occur?
Thrust levers in CL detent and A/THR pushbutton on the FCU is pushed, or
A/THR disconnects due to a failure
What controls the engine LP fuel valves?
Engine MASTER switch
ENGINE FIRE pushbutton
What does a fault light on the ENG panel indicate?
Auto start abort
Switch disagreement between HP valve and its commanded position
