POWERPLANT Flashcards
How are the FADECs powered?
The system has its own alternator making it independent of the aircraft electrical system. The alternator comes online above 10% N2
If the alternator fails the FADEC automatically switches to aircraft electrical power.
If the FADEC detects a fault during an automatic start, what crew intervention will be required?
None. The FADEC will discontinue the start, dry crank to clear the fuel from the engine, and attempt a restart (if warranted) automatically.
How many igniters fire during an automatic ground start sequence?
One, with the other serving as a backup.
The FADEC automatically alternates A and B in each subsequent start.
How many igniters fire during a manual or in-flight start?
Two, A and B
On the ground, how can the A/THR be armed?
Provided at least one FD is on, advancing the thrust levers to TOGA or FLEX (as appropriate) the A/THR will be armed.
What is the active range of the
A/THR?
Just above idle to the CL detent with 2 engines
Just above idle to the MCT detent with only 1 engine
What determines the maximum thrust the A/THR system will be able to command?
Thrust Lever Angle
What are 3 ways to disconnect
A/THR?
- the A/THR pb
- the instinctive disconnect buttons
- Thrust levers idle
What is the proper way to disconnect
A/THR?
First match the thrust lever angle to the current EPR, then push the instinctive disconnect buttons.
How would A/THR be disconnected for the remainder of the flight?
Press and hold the instinctive disconnect buttons for 15 seconds.
The A/THR cannot be re-engaged once this is done.
ALPHA FLOOR will be lost as well.
What happens during
ALPHA FLOOR?
Thrust - TOGA
FMA - A FLOOR
When does the aircraft leave ALPHA FLOOR, and what changes on the FMA?
Upon reaching a lower angle of attack.
The FMA changes to TOGA LK
When will ALPHA FLOOR activate?
high AOA
When would Thrust Lock occur?
Thrust levers in the CL detent and the A/THR pb on the FCU pressed, or if the A/THR disconnect due to a failure.
How do you get out of THR LK?
Move the thrust levers out of the
CL detent
What controls the LP fuel valves?
Engine Master sw
ENGINE FIRE pb
What does a FAULT light on the ENG panel indicate?
Abnormal position of the HP fuel valve, or…
An automatic start sequence abort, or…
A thrust control malfunction
