Engine Flashcards
How does fuel get from the fuel tanks to the engine
low pressure pump - returns to fuel tank as motive flow
high pressure pump - flows through fuel/oil heat exchanger to fuel filter then Fuel Metering Unit (FMU) then through high pressure pump before returning to FMU
Describe the FMU
controlled by the FADEC, meters and distributes the proper amount of fuel for combustion and controls shutoff valve
Describe the Variable Geometry Actuator
consists of two fuel driven actuators controlled by the FADEC via FMU, optimizes position of compressor stators for efficiency
The engine starting system is comprised of:
- air turbine starter
- starter control valve
How many igniters are used for start
ground - one
air - both (2)
Does the FADEC provide abnormal engine start protection in the air
NO
Describe the auto relight function
turns on both igniters and schedules the relight fuel flow in the event of engine flame out or if N2 falls below 52%; “WML” icon is displayed next to N2
How is the thrust reverser system actuated and controlled
hydraulically actuated, control via thrust lever
What does the T2 sensor monitor
engine air inlet temperature for use in FADEC control calculations
What does the N1 sensor provide
fan speed data and airplane vibration monitoring
How is the FADEC powered
above 50% N2 - Permanent Magnet Alternator (PMA)
below 50% N2 - electrical system
The FADEC provides engine start protection on the ground as follows:
- hung start
- hot start
- no light off
Describe the FADEC overspeed protection
commands engine shutdown when N2 reaches 102%, relights when within limits (unless 3 consecutive overspeeds)
Describe the FADEC overtemp protection
controls ITT limits for engine start and throughout operation; will not allow fuel flow during start if ITT is above 120C
Describe the ATTCS
available for takeoff and go around; automatically commands RSV when it is armed and thrust levers are at TOGA and one of the following occurs:
- difference between N1 values is greater than 15%
- one engine failure during takeoff
- one engine failure during go-around
- windshear detection
Max thrust rating in lbs
14,200 lbs (t/o 1 or GA, one engine operative, attcs on)
ENG 1 or 2 OIL LO PRESS warning
engine oil pressure is low
ENG 1 or 2 REV DEPLOYED warning
thrust reverser deployed unexpectedly or not stowed when ordered to stow or thrust reverser position undetermined
ENG 1 or 2 CONTROL FAULT caution
thrust modulation is disabled. OBV has failed open or engine will respond slowly
ENG 1 or 2 FADEC OVERTEMP caution
FADEC overtemperature has been detected
ENG 1 or 2 FAIL caution
engine 1 or 2 shutdown has occurred
ENG 1 or 2 FUEL IMP BYPASS caution
fuel filter impending bypass
ENG 1 or 2 FUEL LO PRESS caution
engine 1 or 2 fuel pressure low, backup fuel pump will be activated
ENG 1 or 2 NO DISPATCH caution
no dispact condition detected by FADEC
ENG 1 or 2 OIL LO LEVEL caution
engine 1 or 2 oil level is below minimum
ENG 1 or 2 REV FAIL caution
thrust reverser is not available
ENG 1 or 2 REV PROT FAULT caution
reverser fault detected, operation not inhibited
ENG 1 or 2 REV TLA FAIL caution
respective reverser solenoid protection has failed
ENG 1 or 2 START VLV OPEN caution
start valve not closed while engine running
ENG 1 or 2 T2 HEAT FAIL caution
T2 heater failed
ENG 1 or 2 TLA FAIL caution
dual thrust lever angle sensor failure
ENG EXCEEDANCE caution
in flight engine limit exceedance detected
ENG NO TAKEOFF DATA caution
takeoff data not entered successfully, discrepancy between information entered in FMS for engine 1 and 2 detected
ENG REF A-I DISAG caution
ice protection mode selector knob set to the ON position with OFF or ENG in the take off data set menu
ENG REF ECS DISAG caution
discrepancy between REF ECS input and actual ECS bleed configuration
ENG THR RATING DISAG caution
discrepancy between maximum thrust rating of engines 1 and 2, possible asymmetric engine thrust
ENG TLA NOT TOGA caution
TLA not at TO/GA position during takeoff and/or go around phase
ENG 1 or 2 FADEC FAULT advisory
one FADEC channel no longer sending data
ENG 1 or 2 FUEL SW FAIL advisory
fuel pressure switch indicates pressure is not low while all fuel pumps are off
ENG 1 or 2 OIL IMP BYPASS advisory
oil filter impending bypass
ENG 1 or 2 OIL SW FAIL advisory
oil impending bypass switch or oil pressure switch failure detected
ENG 1 or 2 SHORT DISPATCH advisory
short time dispatch fault condition
ENG 1 or 2 REV INHIBIT status
reverser inhibited by mx
ENG 1 or 2 TLA NOT IDLE status
thrust lever angle not set to idle position during engine start
