Powerplant & Props Flashcards
Accessory gearbox consists of what?
Gears for Starter gen, FCU, Engine driven Fuel pumps, oil pump, oil scavenge pump, air conditioner compressor, N1 Tachometer
How many Stages?
3 stage axial compresses air, centrifugal compressor distributes air to combustion chamber
What % air is used for what in the engine?
Approx 25% for combustion,
75% for cabin pressurization, bleed valve operation, turbine combustion Chamber and fuel nozzle cooling, bearing sealing
Ignition and start limits
40sec on 60 sec off 40 sec on 60 sec off 40 sec on 30 minutes off
Auto ignition arms at approximately
460 ft. Lbs (AFM)
500 ft. Lbs (QRC)
When do second set of fuel nozzles kick in on start?
35 N1
What is max prop RPM and torque when primary governor has failed?
2120 RPM
1800 lbs torque
Fuel topping governor limits RPM to what?
In flight 106% of primary governor setting
Reverse 95% (1900rpm)
How does the fuel topping governor work?
Vents air from the FCU reducing fuel flow
What is P2.5? What’s it used for?
When does auto ignition arm?
Approx 460 ftlbs
How do the power levers work?
Control N1 by controlling P3 to the fcu
Where is torque reading from?
Reduction gearbox
Where is fuel flow measured?
Between engine driven fuel pump (high pressure pump) and fuel manifold
Total oil, tank, and dipstick capacity.
Total 15.25 qt (3.8 usg)
Tank 10 qts
Dipstick with anti siphon 4qts
