Engines Flashcards
(42 cards)
How much thrust do the engines produce in normal? APR?
8729 lbs (9220)
The engines are flat rated to ISA + ___
ISA + 15
The N2 is composed of ___, ___, ___ and a ___.
14-stage axial flow compressor, a combust or section, accessory gearbox, 2-stage high-pressure turbine
Bypass air is produced by ___
single stage N1 fan
Bypass air produces ___% of the thrust at takeoff
80%
Variable geometry vanes uses ___ (controlled by the ___) to adjust the ___ to stabilize airflow and prevent ___ or ___
fuel (FCU); compressor inlet guide and stator vanes; compressor stall or surge
The accessory gearbox is comprised of _____.
Hydraulic pump Oil reservoir and pumps Generator (IDG) Fuel pump and FCU (high pressure fuel for motive flow) Alternator (N1 control amplifier) Air Turbine Starter
Engine Fuel performs four functions:
moves the compressor stator and guide vanes;
cools engine oil;
actuates and lubricates fuel system components;
provides motive flow for scavenge and main ejector pumps
The fuel system is regulated by the ___ and ___
Fuel control unit (FCU) and Electronic fuel control unit (ECU)
The FCU responds to the mechanical commands of the ___
thrust levers
The FCU schedules fuel during ____ and ____ power settings. It matches the ___ (N1 or N2)
Engine start and low power settings (<79% N1)
It matches the N2 readings
The ECU or N1 Control Amplifier trims/adjusts ___ power settings but only if the ___ switches are in the ON position.
High >79% N1
ENG SPEED switches
max consumption of oil
0.05 gallons per hour
Remote tank quantity test is located ___.
The remote replenishment tank is located in the ___.
Pilot’s side in cockpit
aft equipment bay
The remote oil replenishment tank holds ___ gallons
Check engine oil levels between ___ and___ after engine shutdown.
6 gallons
15 min and 2 hours
If replenishment period is exceed then you must ___ before testing or adding oil.
If note than ___ US quarts of oil must be added you must ____ before adding more oil
dry motor the engine
2 US quarts
dry motor engines for min of 30 sec
The Air Turbine Starter can dry motor the engine up to ____ N2
The starter disengages at ___ N2
Do you need to let the ATS come to a complete stop before reengaging?
28% N2
55% N2
No; can reengage if N2 < 55%
The starter control valve controls the initial rate of engine acceleration by regulating the amount of ___ supplied to the starter.
air
To open the starter control valve you need ___ supplied by either the ___ or ___ AND ___ supplied by the ___, ___, or ___
28 vDC: APU battery or external power
AND
10th stage bleed air: APU (40psi), external air (45 psi), other engine (60 psi - 85%N2)
The ___ switch controls the starter control valve.
Engine START/STOP switch
Pressing the ENG START/STOP switch:
1) opens the ___ valve allowing ___ to engage the ___
2) illuminates the ___
3) opens the ___, ___ and ___ valves
1) starter control valve; bleed air to engage the ATS
2) white START switch
3) 10th Stage L ENG, R ENG and ISOL valves
At ___% N2 the start control valve ___ and the ___disengages.
55% N2; de-energized
ATS
Engine starter limitations:
1 and 2:
3 and subsequent:
30 sec - no cooling between
30 sec - 5 min cooling btwn attempts
Engine dry motor limitations:
1:
2 and subsequent:
90 sec - 5 min cooling
30 sec - 5 min cooling
