Powerplant Flashcards
What is the CRJ 700 power plant model number?
Either General Electric CF34-8C1 or
General Electric CF34-8C5B1
What is the CRJ 900 power plant 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 + 35 Celsius
What is the min ambient air temperature for takeoff and landing?
- 40 Celsius
What is the Max altitude for a windmill start?
21,000 feet
Max engine to engine N2 split at ground idle power?
2%
How much thrust is produced by core air?
About 20%
How much thrust is produced by by-pass air?
About 80%
How many stages of compression do we have and what type of compressor do we have?
The engine is equipped with a 10 stage axial flow compressor
What accessories are driven off of the N2 accessory gear box?
Engine driven fuel pump IDG Air turbine starter Engine driven hydraulic pump Oil pump FADEC alternator
What is 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 will be used in the event the capacity of the 6th stage has been exceeded
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 and ITT <120
What is the air pressure requirement provided by the operating engine to initiate a cross-bleed start?
42 PSI to a max 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, N1’s 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 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 - Left reverser uses hydraulic system 1 and Right 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. 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 stowed or at idle?
CRJ 900: 60 KTS
CRJ 700: 75 KTS
What happens when a thrust reverser inadvertently deploys?
FADEC commands reverser to close and thrust 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 for engine start is used if the APU is inop?
Ground air cart attached to the high pressure air ground connection to start one engine. A cross-bleed start is used to start the other engine once it is cleared with ground control
Where is the high pressure air ground connection located?
Under the left engine nacelle
When will the start cut-out during an engine start?
50% N2
