Powerplant Flashcards
CRJ powerplant model
General Electric CF-34-8C5
Normal takeoff thrust for CF-34-8C5
13,360 lbs thrust
Automatic Performance Reserve (APR) thrust rating for the CF-34-8C5
14,510 lbs thrust
Max Continuous Thrust (MCT) for the CF-34-8C5
13,680 lbs thrust
Max temperature for takeoff and landing
ISA +40 degrees C
OAT of +51 degrees C
Min ambient air temperature for takeoff
-40 degrees C
Max altitude for windmill engine start
21,000 MSL
Max engine to engine N2 split at ground idle power
2%
How much thrust is produced by the core air
Approximately 20%
How much thrust is produced by the bypass air
Approximately 80%
How many compressor stages are there in the CF-34-8C5
10 stages
What accesories are driven off of the N2 accessory gear box
Engine driven fuel pump
IDG
Air Turbine Starter (ATS)
Oil pump
FADEC alternator
What stages supply bleed air to the common bleed air manifold
Normally the 6th stage, the 10th stage is also available when the demand exceeds the capabilities of the air in the 6th stage
What allows 10th stage bleed air availability
Air Conditioning System Controller (ACSC), automatically opens the High Pressure Valve (HPV)
What is the engine bleed air used for
Engine starts
Pressurization and air conditioning
Wing and cowl anti ice
What is the min bleed air pressure required for a cross bleed start
42 PSI at a max of 80% N2 for operating engine
What is the normal air source for the starting engine
APU bleed air
What source is used to start an engine when the APU is INOP or shut down
Ground air cart
Cross bleed starts from and operating engine may also be used
Where is the high pressure, ground air supply connection located
On the fuselage aft of the cargo bay door
What are the engine starter cranking limits
Attempt 1-2, 90 seconds ON / 10 seconds OFF
Attempt 3-5, 90 seconds ON / 5 minutes OFF
What are the dry motoring limits
Attempt 1, 90 seconds ON / 5 minutes OFF
Attempt 2-5, 30 seconds ON / 5 minutes OFF
What causes the FADEC to automatically abort a start
Hot start
Hung start
How many ignitors are installed in each engine
2
What supplies power to the ignitors
IGN-A: AC ESS BUS
IGN-B: Static invertor on the battery bus
When must continuous ignition be used
Takeoffs and landings on contaminated runways
Flight through moderate or heavy rain
Flight through moderate or heavy turbulence
Flight in the vicinity of thunderstorms
When is continuous ignition automatically activated
When approaching a high angle of attack
What conditions are required before advancing thrust levers to IDLE during an engine start
N2 greater than 20%
ITT below 120 degrees C
What conditions would cause a takeoff configuration warning
Parking break set
Autopilot ON
Spoilers extended
Flaps not 8 or 20 degrees
Aileron trim out of green range
Rudder trim out of green range
What is APR
Automatic Performance Reserve
When is APR armed for takeoff
When the N1 RPM of both engines is within 8% of scheduled takeoff power
When is APR armed for landing
Flaps 20 degrees or greater
Landing gear is down
When will the APR system be activated
Thrust levers in TOGA
N1 differs by 15% or greater on one engine after APR is armed
Thrust levers set to MAX POWER
HIGH PWR SCHEDULE switchlight is selected ON
What occurs when APR system activates
FADEC commands a thrust increase dependant on the thrust lever position
What indication is displayed when APR is activated
Green APR icon on N1 gauge
If an engine fails during a go-around, will the APR system activate
Yes
What is used to deploy the thrust reversers
L reverser uses hydraulic system 1
R reverser uses hydraulic system 2
What indications will be displayed during thrust reverser deployment
Amber REV icon on the N1 gauges during cowl transition
Green REV icon on the N1 gauges when they are fully deployed
What is occuring during thrust reverser deployment
The translating cowls move aft, blocking the rearward flow of bypass air
The fan discharge airflow is redirected forward through the cascade vanes
When do the thrust reversers need to either be stowed or at idle
60 knots
What are indications of an inadvertent thrust reverser deployment
Amber REV icon on the N1 gauge
REV UNLOCKED caution message
FADEC commands idle thrust of affected engine
Note: Thrust levers will not move when when FADEC commands idle thrust
Minimum oil temperature for start
-40 degrees C
Maximum continuous oil temperature
155 degrees C
Maximum permissible oil temperature
163 degrees C
15 minutes max
Maximum oil consumption
0.05 gallons per hour
Where can the oil quality be checked
EICAS menu page
When should oil capacity be checked
3 minutes - 2 hours after shutdown
When should the oil level be replenished
15 minutes- 2 hours after shutdown
How is oil cooled
Fuel/oil heat exchanger
Maximum oil refill before dry motoring is required
2 quarts
What is the total oil quantity of the engine oil tanks
7.2 quarts
