Study Guide: Engines and APU

Question 1

757/763: There are two engine idle speeds: minimum and approach idle. One way approach idle is activated automatically is when:

Answer 1

Trailing edge flaps are extended beyond position 20

Question 2

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.

Answer 2

5

Question 3

763: When the engine is operating, the engine electronic engine control (EEC) is powered by:

Answer 3

A dedicated permanent magnet alternator (PMA)

Question 4

757: Each engine electronic engine control (EEC) is powered by:

Answer 4

Dual dedicated generators (DDG)

Question 5

764: Anytime the engine is running, the engine electronic engine control (EEC) is powered by:

Answer 5

Permanent magnet generator (PMG)

Question 6

763: If both channels in an electronic engine control (EEC) fail, the associated engine will:

Answer 6

Decelerate to and remain at minimum fuel flow

Question 7

757/763: How can continuous ignition and approach idle be selected without using the
engine anti-ice switches?

Answer 7

By performing a normal approach

Question 8

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?

Answer 8

There is no N2 overspeed protection

Question 9

764: If both channels in an electronic engine control (EEC) fail, the associated engine:

Answer 9

Performs an automatically controlled engine shutdown.

Question 10

767: According to the graphic, the left electronic engine control alternate mode (ALTN) switch light has illuminated. This indicates:

Answer 10

Automatic reversion or manual selection to the alternate mode

Question 11

757/763: What does the amber REV light displayed above each EPR indication indicate?

Answer 11

The reverser is in transit

Question 12

757: The thrust control system includes an electronic limiter control (ELC) unit. What is its primary purpose?

Answer 12

N1 overspeed protection

Question 13

757: The thrust system consists of a hydromechanical engine fuel control with an electronic engine control (EEC) unit. The EEC sets thrust by controlling:

Answer 13

EPR based on thrust lever position

Question 14

757/763: The thrust management computer (TMC) calculates a reference _____ based
on existing pressure altitudes and ambient temperature data from the air data system.

Answer 14

EPR

Question 15

757: The FUEL CONTROL switches have three positions: RUN, RICH, and CUTOFF. When should the RICH position be used during engine start?

Answer 15

EGT 0°

Question 16

757/767 When does the ENG START selector automatically move from the GND position to the AUTO position during engine start?

Answer 16

At approximately 50%

Question 17

757/767: Minimum idle is a lower thrust than approach idle and is selected:

Answer 17

During ground operation and all phases of flight except approach and landing

Question 18

757/763: When the standby engine indicator (SEI) selector is _________ and both CRTs
fail, engine indications will be displayed automatically.

Answer 18

Positioned to AUTO

Question 19

757/767: With the FUEL CONTROL switch out of CUTOFF, rotating the ENGINE START selector to the FLT position:

Answer 19

Bypasses the ignition selector and causes both ignition systems to operate continuously

Question 20

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?

Answer 20

To protect the unit from thermal shock

Question 21

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:

Answer 21

Automatically shut down

Question 22

757/767: During APU start and shutdown, the FAULT light illuminates momentarily. What
causes its illumination?

Answer 22

The APU fuel valve is not in the commanded position

Question 23

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?

Answer 23

For a fault or a fire

Question 24

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:

Answer 24

Throughout the aircraft operating envelope

Question 25

757/767: Fuel is normally supplied to the APU from the left main fuel tank. Should conditions require, fuel can be supplied from:

Answer 25

Any fuel tank through the crossfeed system

Question 26

757/767: While on the ground, turning the BAT switch off causes the APU to:

Answer 26

Shut down

Question 27

757/767: In flight, APU bleed air is available up to approximately:

Answer 27

17,000 feet

Question 28

757/767: The APU fuel valve fails to reach the commanded position during an APU start or shutdown, this is indicated by:

Answer 28

APU fault light and EICAS advisory APU FUEL VAL

Question 29

763: If a fault exists in the thrust reverser system, this will be indicated by:

Answer 29

A REV ISLN light on the center control pedestal and an EICAS advisory message REV ISLN VAL

Question 30

757: According to the graphic, the R EEC INOP light is illuminated. This indicates:

Answer 30

A failure is detected in the system and the EEC trim motor holds the current trim level until the unit is turned off

Question 31

757: According to the graphic, the L ELC INOP light is illuminated. This indicates:

Answer 31

A failure is detected in the system and the ELC will hold the current trim level until the unit is turned off

Question 32

757/763: When pushed, the maximum indication reset (MAX IND RESET):

Answer 32

Resets and blanks all maximum exceedance values on EGT, N1, N2, and N3

Question 33

757/767: The magenta fuel on command bug is displayed. When is this bug shown?

Answer 33

Engine is shutdown on the ground, or inflight, when X-BLD is displayed

Question 34

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.

Answer 34

CONT

Question 35

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).

Answer 35

Idle speed