38. ENGINES/THRUST LEVERS Flashcards
What controls the engines in all operating regimes?
FADEC (Full Authority Digital Engine Controls)
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?
o The system has its own alternator making it independent of the aircraft electrical system when N2 is above a set value.
o If this alternator fails, the FADEC automatically switches to aircraft electrical power.
When will the FADEC abort a start?
o Hot start, Hung start
o Stalled start
o No light up
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?
o Bleed demands
o Approach Configuration
o High engine or IDG temperatures
How many igniters fire during a Normal automatic ground start sequence?
o One igniter with the other serving as a backup
o The FADEC automatically alternates the igniters (A and B) at each start.
How many igniters fire on Manual or In‐flight starts?
Both A and B
When does continuous ignition automatically operate?
Engine flameout detection
What is the active range of the A/THR?
o Just above IDLE to the CL detent (2 engines)
o Just above IDLE to the MCT detent (1 engine)
What is the normal operational position of the thrust levers when A/THR is active?
The CL detent
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?
o A/THR pb on FCU (not recommended)
o Instinctive Disconnect buttons
o Thrust Levers to IDLE
How do you disconnect the A/THR for the remainder of the flight?
Press and hold the Instinctive Disconnect button for 15 seconds.
Will you be able to restore A/THR?
No, on ground only after both FMGC power up
