Study Guide Engine Flashcards
What types of engines are on the aircraft?
-TWo GE CF-34-8E5 Hi-Bypass, 2 spool, axial flow, turbo fan
How much thrust do the engines produce?
13,800-14,200
Describe N1 spool
Single stage fan, 4 stage LP turbine
Describe N2 spool
10 stage compressor, 2 stage HP turbine
How many ignators per engine?
2 per
How many ignitors activate for engine start?
Ground
- 1 igniter (switch in AUTO)
- 2 igniters (switch in AUTO)
What happens when the ignition switch is selected to OVRD?
Activates both igniters on the ground and 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 while the other is standby. They alternate with each start
What does the Cyan line on the N1 gauge represent on approach and when does it appear?
- Minimum N1 for bleed requirements in icing conditions
- Configured for landing <1200 RA (when anti ice is on)
What sources are available for engine starting?
- APU
- Ground source (Air)
- Opposite engine
- Windmilling
Does the FADEC provide engine start protection?
Only on the ground for a hot, hung start, or no light off
What will the FADEC automatically do in case of a Hot start?
- FADEC will not allow FF if ITT >120 C
- FADEC will automatically dry motor engine
Describe the engine start sequence
Start switch to start
- 7% N2 ignition
- 20% N2 Fuel flow
- 20% N2 +5 seconds Light off
- 50% N2 ignition off
Engine stabilizes:
- N1 27%
- ITT 460 C
- N2 62%
- FF 550 lbs/hr
- Oil pressure >25psi
What does WML mean on the engine indications?
- Windmilling engine
- The FADEC has detected a flame-out and is attempting an auto re-light, or
- An assisted start has been commanded