Powerplant Flashcards
Engine idle time before ENG RUN to off?
3 mins
Max takeoff ITT and time limit?
900ºC for 5 mins (10 mins single engine)
Capacity of oil replenishment tank?
6 quarts
Which aircraft systems use bleed air?
Air conditioning; pressurisation; cowl and wing anti ice; engine starting
Rolls Royce designation for Global high bypass turbofan engine?
BR710 A2-20
What engine oil pressure indication requires an engine shutdown?
25PSI
Min oil temp for start?
-40ºC
Temperature for cranking after failed engine start attempt?
150ºC or starter limit
Selecting ENG RUN to off closes which fuel shutoff valve?
High pressure shutoff valve within the fuel metering unit
What compressor stages supply bleed air?
5th and 8th stage
Air pressure requirement for external air start unit?
40 PSI
Min oil temp before accelerating above idle?
+20ºC
How is the engine oil cooled?
Fuel cooled oil cooler (also used to warm low temp fuel prior to the FMU)
Max N2 RPM for engine started engagement?
N2 less than 42%
When is the use of the oil replenishment system prohibited?
OAT at or below -12ºC
Max tailwind for engine start?
20 knots
Max engine relight altitude?
30,000 feet
When should “rotor bow” dry cranking be expected during auto starts?
Between 20mins and 5 hours of previous shutdown
How are the thrust reversers controlled and powered?
Controlled by the EEC and powered be the respective engine HYD sys 1 or 2
Time limitation for accurately checking engine oil quantity?
Between 5 to 30 mins after shutdown
Starter cranking limits?
3mins on, 15secs off, 3 mins on, 15secs off, 3 mins on 15mins off
Minimum oil quantity for aircraft operation in excess of 3 hours?
Full before flight (10.62 quarts)
When is high idle commanded by the EEC?
When the aircraft is in the approach configuration
What is the backup power source for the FADEC when the 28VDC (Batt Bus) is not available?
By a dedicated generator on the accessory gearbox
Max oil temp?
+160ºC
How is the ITT measured?
Seven dual element thermocouples located in the LP turbine entry area
How is the engine pressure ratio calculated?
Ratio of engine inlet total pressure (TAT probe) and engine exhaust total pressure
Max engine oil quantity?
12.8 US quarts (typically fill to 11.0 US quarts via oil replenishment system)
Max oil consumption for engine?
.21 US quarts/hour
How is the engine protected from overspeed?
When EEC recognises N1 or N2 overspeed, it closes the fuel high pressure SOV
Where are the N1 and N2 RPM speed sensors located?
N1: Near the LP compressor shaft; N2: front of the accessory gearbox
How is thrust management controlled throughout all phases of flight?
FADEC, note: an EEC is a major component of the FADEC
What are the two autostart air envelopes and airspeeds?
ATS envelope (≤249knots) Windmill envelope(≥250knots)
Which events would cause FADEC auto shutdown on ground?
N2≤15%(120secs). Idle not achieved by 120secs. Starter cutout not reached within starter duty timer(3min) ITT exceeds start limit (700ºC)
Thrust REV limitations?
Prohibited in flight, touch and go landings and to back up aircraft.
Minimum N2 idle limit?
58%
Engine thrust rating?
14750lb at sea level ISA +20ºC
Max ITT for ground/air start?
700ºC (ground), 850ºC (air)
