Systems Questions (Oral and Test) Flashcards
Is there a speed limit for ADG deployment?
Yes, Vmo (335 Kts)/Mmo (0.85 Mach)
What is on the accessory gearbox?
- fuel pump (engine driven high pressure)
- integrated drive generators
- starter (air turbine)
- hydraulic pumps (engine driven) - EDP’s
- Oil Pump
- FADEC Alternator (+)
When does APR automatically arm?
When N1 RPM of both engines are within 8% of takeoff power, (normal or reduced)
What type of takeoff thrust setting is automatically calculated by FADEC?
Normal Takeoff thrust
What conditions are you looking for to move the thrust lever to idle position after engine start?
- N2 greater than 20%
AND
- ITT is 120 degrees or less
What doors are NOT on the Synoptics page?
- AFT equipment bay
- Crew Escape Hatch
How much core air thrust is produced by the CF34-8C5 (CRJ 900) engine?
20%
How much bypass air thrust is produced by the CF34-8C5 (CRJ 900) engine?
80%
How much engine thrust is produced by APR?
14,750 lbs
When will FADEC automatically increase thrust to the operating engine?
When an engine fails and N1 mismatch of 15% or more is detected
When is continuous ignition required?
- Takeoffs/Landings on contaminated runways
- Flight through moderate or heavy rain
- Flight through moderate or greater turbulence
- Flight in vicinity of thunderstorms
When does the air turbine starter disengage on the starter system?
N2 reaches 50%, of the STOP Switch light is pressed
When do we want to introduce fuel on an engine start (moving the thrust lever to idle position)?
- N2 is 20% or greater AND ITT is less than 120 degrees C
If NOT followed (HOT START will occur and FADEC will not allow engine to start)
FADEC will automatically abort a start for…
- Hung Start
- Hot Start
- L(R) START ABORT (caution message will be displayed)
Where is the Oil Replenishment Tank located?
AFT Equipment Bay
Reference Slide #73 - Powerplant
What stage of compression is bleed air extracted from?
6th and 10th stage
What are the thrust lever Detents located?
- Climb
- TOGA
- Max Power
What hydraulic system powers the left thrust reverser? Right thrust reverser?
- Left thrust reverser powered by hydraulic system # 1
- Right thrust reverser powered by hydraulic system # 2
Where is the APU located?
Located in the aircraft tail one
What causes the APU to automatically shutdown on the ground?
High Oil Temperature, Loss of Oil Pressure (“HOTLOP”)
In flight, what happens when there is a loss of oil pressure or high oil temperature in the APU?
Caution Message will appear on EICAS display but APU will continue to operate
Where does the APU receive fuel from?
Left collector tank via the APU fuel pump
What voltage on the batteries are we looking for prior to starting the APU?
Minimum of 22 volts on main battery and APU battery
Why do we need a minimum voltage on the main battery and APU battery prior to starting the APU?
Main battery powers the ECU, APU battery provides power to crank the starter