Powerplant Flashcards
What is the CRJ-900 Powerplant Model Number
General Electric CF34-8C5
What is the thrust rating without APR/with APR and mct?
Without APR 13,360lbs
With APR 14,510 lbs
Mct 13,680
What is the Max ambient air temperature for takeoff and landing
ISA + 40°C
What is the Min ambient air temperature for takeoff and landing
-40°C
What is the Max Altitude for a windmill start
21,000 ft MSL
Max engine to engine N2 split at ground idle power
2%
How much of the thrust is produced by core air
Approximately 20%
How much thrust is produced by by-pass air
Approximately 80%
How many stages of compression do we have
The engine is equipped with a 10 stage axial flow compressor.
What accessories are driven off the N2 accessory gear box? (fish oil plus)
Engine driven fuel pump, IDG, air turbine starter, engine driven hydraulic pump, oil pump, FADEC alternator
What is the engine bleed air used for
Engine start, air conditioning, pressurization, wing and cowl anti-ice
What stages of bleed air are used
Normally 6th stage,10th stage used when demand exceeds capability of 6th stage.
What allows 10th stage bleed air availability
Air Conditioning System Controller (ACSC) automatically opens the High Pressure Valve (HPV).
How many igniters are installed on each engine
Two, IGN-A and IGN- B
What are the required parameters before fuel is introduced during a ground engine start
20% or greater N2
ITT <120°C
What is the air pressure requirement provided by the operating engine to initiate a cross-bleed start
42 PSI to a maximum of 80% N2
When will APR arm on takeoff
Engine speed within 8% of scheduled takeoff power, normal or flex
When will the APR system activate
Thrust levers in TOGA,
normal or flex thrust scheduled, and N1s differ by 15% or greater or when thrust levers set in the MAX POWER detent
What occurs when the APR system activates
FADEC commands an N1 speed increase dependent on thrust lever position
What indication will we have of APR activation
Green APR icon on operable engine N1 gauge
If an engine fails during a go-around, will the APR system activate
Yes
What is used to deploy and stow the thrust reversers
Hydraulics
L reverser uses hydraulic system #1
R reverser uses hydraulic system #2
How are the thrust reversers deployed
Thrust levers must be at idle. The reverse thrust levers are raised by engaging the thrust reverse release triggers. A solenoid lock stops reverse thrust lever movement while the reversers deploy. Once deployed, the lock releases and N1 may be increased by raising the reverse thrust levers.
What is occurring during thrust reverser deployment
The translating cowls move aft. The bypass air is redirected through cascade vanes which redirect the air forward
