Study Guide: Engines and APU Flashcards
757/763: There are two engine idle speeds: minimum and approach idle. One way approach idle is activated automatically is when:
Trailing edge flaps are extended beyond position 20
757/763: Approach idle provides better engine acceleration for go-around or reverse thrust. After a ___ second delay following touchdown, the engines decelerate to
minimum idle to minimize landing distance.
5
763: When the engine is operating, the engine electronic engine control (EEC) is powered by:
A dedicated permanent magnet alternator (PMA)
757: Each engine electronic engine control (EEC) is powered by:
Dual dedicated generators (DDG)
764: Anytime the engine is running, the engine electronic engine control (EEC) is powered by:
Permanent magnet generator (PMG)
763: If both channels in an electronic engine control (EEC) fail, the associated engine will:
Decelerate to and remain at minimum fuel flow
757/763: How can continuous ignition and approach idle be selected without using the
engine anti-ice switches?
By performing a normal approach
757: The thrust system consists of a hydromechanical engine fuel control with an electronic engine control (EEC) unit. Is any overspeed protection provided for the N2
rotor?
There is no N2 overspeed protection
764: If both channels in an electronic engine control (EEC) fail, the associated engine:
Performs an automatically controlled engine shutdown.
767: According to the graphic, the left electronic engine control alternate mode (ALTN) switch light has illuminated. This indicates:
Automatic reversion or manual selection to the alternate mode
757/763: What does the amber REV light displayed above each EPR indication indicate?
The reverser is in transit
757: The thrust control system includes an electronic limiter control (ELC) unit. What is its primary purpose?
N1 overspeed protection
757: The thrust system consists of a hydromechanical engine fuel control with an electronic engine control (EEC) unit. The EEC sets thrust by controlling:
EPR based on thrust lever position
757/763: The thrust management computer (TMC) calculates a reference _____ based
on existing pressure altitudes and ambient temperature data from the air data system.
EPR
757: The FUEL CONTROL switches have three positions: RUN, RICH, and CUTOFF. When should the RICH position be used during engine start?
EGT 0°
757/767 When does the ENG START selector automatically move from the GND position to the AUTO position during engine start?
At approximately 50%
757/767: Minimum idle is a lower thrust than approach idle and is selected:
During ground operation and all phases of flight except approach and landing
757/763: When the standby engine indicator (SEI) selector is _________ and both CRTs
fail, engine indications will be displayed automatically.
Positioned to AUTO
757/767: With the FUEL CONTROL switch out of CUTOFF, rotating the ENGINE START selector to the FLT position:
Bypasses the ignition selector and causes both ignition systems to operate continuously
757/767: During APU shutdown, the APU control system incorporates a time-delay feature. The time delay is variable from 0 to 120 seconds. Why is this feature incorporated?
To protect the unit from thermal shock
757/767: According to the graphic, the APU FAULT light is illuminated. The light illuminates whenever a fault is sensed. In this situation, the APU will:
Automatically shut down
757/767: During APU start and shutdown, the FAULT light illuminates momentarily. What
causes its illumination?
The APU fuel valve is not in the commanded position
757/767: During normal operations, APU shutdown incorporates a time-delay feature permitting APU cooling. When is the APU shut down automatically and the cool-down
delay bypassed?
For a fault or a fire
757/767: Although the primary purpose of the APU is to supply electrical power and bleed air on the ground before engine start, the APU can also be started inflight, and
provide electrical power:
Throughout the aircraft operating envelope
757/767: Fuel is normally supplied to the APU from the left main fuel tank. Should conditions require, fuel can be supplied from:
Any fuel tank through the crossfeed system
757/767: While on the ground, turning the BAT switch off causes the APU to:
Shut down
757/767: In flight, APU bleed air is available up to approximately:
17,000 feet
757/767: The APU fuel valve fails to reach the commanded position during an APU start or shutdown, this is indicated by:
APU fault light and EICAS advisory APU FUEL VAL
763: If a fault exists in the thrust reverser system, this will be indicated by:
A REV ISLN light on the center control pedestal and an EICAS advisory message REV ISLN VAL
757: According to the graphic, the R EEC INOP light is illuminated. This indicates:
A failure is detected in the system and the EEC trim motor holds the current trim level until the unit is turned off
757: According to the graphic, the L ELC INOP light is illuminated. This indicates:
A failure is detected in the system and the ELC will hold the current trim level until the unit is turned off
757/763: When pushed, the maximum indication reset (MAX IND RESET):
Resets and blanks all maximum exceedance values on EGT, N1, N2, and N3
757/767: The magenta fuel on command bug is displayed. When is this bug shown?
Engine is shutdown on the ground, or inflight, when X-BLD is displayed
764/763(66XX): There are two engine idle speeds: minimum idle and approach idle. The EEC selects these idle speeds automatically. Rotating the ENGINE START selectors to _______ manually selects approach idle.
CONT
764: The ignition system includes an automatic relight feature. It is enabled in the air or on the ground if N2 drops below _____. If this occurs, the EEC will energize both ignition systems for the affected engine(s).
Idle speed
