Engines Flashcards
How many Igniters per Engine?
Two per engine
How many igniters activate for engine start?
- Ground = 1 igniter (AUTO)
- Flight = 2 igniters (AUTO)
What happens when the ignition switch is selected to OVRD?
- Activates both igniters on the ground or in flight.
Can the igniters be turned off during flight?
- The switch may be moved to the OFF position but the FADEC disregards
the command. - The OFF position is used for dry motoring on the ground only.
What controls the engine?
- A two-channel FADEC
- One channel is active and the other channel remains in standby as a
backup
Do the FADEC(s) alternate automatically during engine start?
- YES (unless a fault is noted)
What does the Cyan line on the N1 gauge represent during approach?
- The minimum N1 for Bleed requirements in Icing Conditions.
When does the Cyan line appear?
- Displayed only in icing conditions during final approach (below RA 1200’)
with landing gear down or flaps extended
The Engine may be started via what means?
- APU
- Ground Source (Huffer cart or Air Bottle)
- Opposite Engine X-Bleed start
- Windmill start
Does the FADEC provide engine start protection?
- Yes, but only on the ground during a hot start, hung start or no light-off.
During an Engine Start, the FADEC will prevent Fuel Flow introduction with an
ITT greater than?
- 120°C
Describe a normal Engine Start sequence (on the ground)?
- Start switch momentarily to START (At least 2 sec)
- 7% N2 = Ignition
- 20% N2 = Fuel flow
- 5 sec after Fuel Flow = Light-off (IGN ON)
- 50% N2 = Ignition off/Starter Cutout
What does the WML indication mean on the EICAS?
- Wind-milling engine &
- The FADEC has detected a flame-out and is attempting an auto re-light, or
- An assisted start has been commanded.
Does Fadec provides underspeed and overspeed protection?
Yes
What happens after 3 overspeed detection events?
- FADEC will not re-light the engine
- (3 events within 30 seconds to trigger it)
