Powerplant Flashcards
How man stages have compressor variable geometry (CVG) vanes
First 4 Stages
If engine oil levels have NOT been serviced within the preceding 36 hrs what restrictions applies?
Engine oil levels must be checked following each shutdown after 3 minutes but before 2 hours following engine shutdown.
APR thrust is limited to how long?
10 min single engine
What is the CRJ-900 power plant model number and 700
General Electric CF34-8C5
Either GE CF34-8C1 or CF34-8C5B1
What is the trust rating normal and with APR
13,560 and with APR 14,750
What is the max ambient air temperature for takeoff and landing
ISA + 35 c
What is the min ambient air temperature for takeoff and landing
-40c
What is the max altitude for windmill start
21,000 ft MSL
Max engine to engine N2 split at ground idle power
2%
How much of the trust 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
10 stage axial flow compressor
What accessories are driven off the N2 accessory gear box
Engine driven fuel pump IDG (integrated driven generator) 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
Normal 6th stage and 10th stage used when demand exceeds 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 grater N2 ITT less than 120c
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 if N1s differ by 15% or greater or when thrust levers are 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
What indication will be seen with normal thrust reverser deployment
Green REV icon on N1 gauge
When do the thrust revers need to be either 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
Where is the high pressure air ground air connection located
Under left engine nacelle
When will the starter cut out during an engine start
50% N2
N1 max continuous, normal T/O, APR or Go around
99.5%
ITT temps Normal T/O
963 for the first 2 min,
947 for the next 3 min
ITT APR Thrust Go-Around
1006 for the first 2 min
990 for the next 3 min
Oil pressure T/O power / Max continues
45-95 PSI
How many channels does FADEC have
2 Channels
How long does FADEC hold higher idle on landing for reverse thrust
5 seconds if thrust reverser not used within the 5 seconds ground idle is set.
What is N2 ground idle
55%-65% N2
Will FADEC increase The N1 on the good engine if you have an engine failure?
Yes, the two FADEC systems talk
When is takeoff N1 thrust locked in
At 65 KIAS
When does FADEC change the N1 setting after takeoff?
When the aircraft passes through 400 ft and the throttles are moved out of the TOGA detent
