Powerplant Flashcards
The engine LP N1 consists of:
A single stage low-pressure compressor, fan, driven by a three stage turbine
The Prat Whitney 305A engines each provide 4600 pounds of thrust at
Sea level up to 23.3 c normal
Sea level up to 31.1 c maximum
The starter/generator, in the start mode through the accessory gearbox, is applied to the:
HP spool (rotor)
The engine HP spool (rotor) n2 consists of a:
Four stage axial flow compressor and a single stage centrifugal compressor driven by a two stage axial flow turbine.
The engine instruments N1 and N2
DC powered through CBs on the DC Bus 2/EMER BAT and DC BUS 1 respectively
The engine oil temp/pressure indication requires
28 DC power
The primary engine thrust indicating instrument is the
Low speed rotor N1
The maximum transient ITT during takeoff is
825 C for 20 seconds
The maximum ITT during engine start is
950 degrees C
Illumination of the L or R ENG FILTERS light indicates
Impending bypass of aircraft fuel filter
… Engine oil filter
… Engine fuel filter
During engine operation of the BOVs, (bleed off valves) are positioned by
EEC command channel
During FADEC operation of the engine, engine overspeed protection is provided by
By N1 and N2 overspeed signals for the active EEC channel to the overspeed solenoid HFCU
By mechanical overspeed protection system
The ENG SYNC light indicates that
ENG SYNC is turned ON, and the nose landing gear is not in the up and locked position
A left or right ENG CMPTR white light indicates
- A minor malfunction has occurred in the one channel of the EEC
- FADEC will continue to monitor for healthiest channel to control the engine
- On ground – do not dispatch.
- In flight – refer to the engine computer light illuminated procedure in section IV of the AFM
Durning a normal ground start, the ignition light should come on when
N2 reaches 6%
Engine oil pressure and oil temperature indications require _________ electrical power
DC
The ENG CMPTR switches are normally in the auto position. Selection of the CH A or CH B position in flight is permitted when:
Amber and White ENG CMPTR lights (same engine) illuminated procedure is used, section 4 AFM
The green TR ARM light means
The TR CONT and TR AUTO STOW CBs are in
The aircraft is on the ground (squat switches in GND MODE)
The engine thrust lever is in idle
As the thrust levers are advanced for take off, the ARM lights:
Go out
During single engine operation what is true in regard to using both thrust reversers
A. Both engine thrust levers must be in idle
B. the full range of reverse thrust will be available on the operating engine with both T/Rs deployed
If a thrust reverser fault occurs in flight and a reverser unlocks, it is stowed by
The auto stowing feature through the TR AUTO STOW CB
Maximum reverse thrust is usable down to what speed
40 KIAS
