Power Plant Flashcards
What is the CRJ-900 Powerplant Model Number
General Electric CF34-8C5
What is the thrust rating without APR/with APR
13,560 lbs/14,750 lbs
What is the Max ambient air temperature for takeoff and landing?
ISA + 40C, Max 51C
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 the 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
What indications will be seen with normal thrust reverser deployment
Green REV icon on N1 gauges
When do the thrust reversers need to be either stowed or at idle
CRJ900: 60 kts
What happens when a thrust reverser inadvertently deploys
FADEC commands thrust to be set to idle on affected engine
What are the indications of an inadvertent thrust reverser deployment
Amber REV icon on N1 gauge,
REV UNLOCKED caution message
What is the normal air source for engine starts
APU or cross-bleed if doing a single engine taxi
What source is used if the APU is INOP
Ground air cart or bottle attached to the high pressure air ground connection to start one engine. A cross bleed start is then used to start the other engine after clearing it with ground control
Where is the high pressure air ground connection located
On the fuselage, aft of the aft cargo bay door.
When will the starter cut-out during an engine start
50% N2
