Powerplant Flashcards
What controls the engines in all operating regimes?
FADEC- Full Authority Digital Engine Control
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
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 during a normal automatic ground start sequence?
- One igniter with the other serving as a backup
- The FADEC automatically alternates the igniters (A/B) at each start
How many igniters fire during a manual or inflight start?
Both A and B
When does continuous ignition automatically operate?
Engine flameout detection
What is the active range of the A/THR?
- Just above IDLE to the CL detent (2 engine)
- Just about 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 levers
What are 3 ways to disconnect the A/THR?
- Instinctive disconnect button
- Thrust levers to IDLE
- A/THR pb on FCU (not recommended)
How do you disconnect the A/THR for the remainder of the flight?
Press and hold the instinctive disconnect button for 15 seconds
After hold the instinctive disconnect button for 15 seconds, will the A/THR be able to be restored?
No, on ground only after both FMGC power up
What else will you lose if you press and hold the instinctive disconnect button for 15 seconds?
Alpha floor protection
When would thrust lock (THR LK) occur?
-Thrust levers in CL detent and A/THR pb on FCU is pushed
OR
-A/THR disconnects due to failure
How do you get out of Thrust Lock?
- Move TL’s out of the detent
- Move TL’s to match the desired thrust setting
What does a FAULT light on the ENG panel indicate?
- Auto start abort
- Position of FUEL HP shutoff valve abnormal
- Malfunction of the thrust control
What are the primary differences between a manual and a normal automatic start?
- The FADEC provides passive survey during a manual start and will provide appropriate ECAM cautions and procedures to follow in the event of a start fault
- Auto start interruption and auto-crank are not available, except when on ground, and the start EGT limit is exceeded before 50% N2
