POWER PLANT Flashcards
When and for how long are FADECs powered?
When AC is applied to the aircraft for 5 min to perform self test, then sleep mode
When IGN/START is selected on AC until > 12% N2
Self powered via accessory gear box generator until
When will the Igniters operate automatically?
If a flame out is detected
What does FADEC do in case of a automatic, aborted engine start (Hot, Hung, Stall or No Light-off)?
- HP fuel valve is closed
- IGN is turned OFF
- CRANKS the engine
- START VALVE is closed (after 60 sec)
What is the only cause for an auto-abort during a MAN start of an engine?
OVHT: if start EGT >725 degrees prior 50% N2
When should the MSTR switch be put to ON in case of a MAN start?
When N2 is > 20% (rather 25%) to protect against OVH/Hight EGT
What happens when the MSTR switch is selected to ON for a MAN start?
- Both ignitors come on
2. HP fuel valve opens
What closes the start valve and when during a MAN start?
The FADEC closes the start valve or when pressing the fire button (signals FADEC so in principle the FADEC)
What causes the FAULT light to illuminate on the engine panel (below the MSTR switch)?
When there is a disagreement between the HP fuel valve position v.s. its commanded position
What do the MAN START Pb’s control?
The start valves via the FADEC
What do both ends of the Transient N1 signify?
N1 Commanded (trend) N1 Actual
On the EGT, what does the amber index signify?
The maximum start EGT (725 degrees)
What does amber/green REV indicate?
Amber: any of the 4 reverser blocker doors not stowed or not locked
Green: all 4 reverser blocker doors fully deployed
How can you tell that the engine start sequence has finished?
AVAIL or N2 gray box has disappeared
When, in flight, does IDLE flash between the N1 gages?
When both engines are in flight IDLE, approach IDLE or bleed IDLE
When is FUEL USED set to 0?
When MSTR switch is selected to ON for a ground start
