Engines and APU

Question 1

On initially receiving power, what format are the engine instruments displayed?

Answer 1

NG: compact engine display

MAX: secondary engine indications

Question 2

On the NG, what format is required for the engine instruments before the engine is started?

Answer 2

Set engine displays to the compact format

Question 3

On the MAX, which DU is required to display the engine instruments?

Answer 3

Set the engine displays to the Captain’s inboard DU

Question 4

When is the engine failure alert, ENG FAIL, displayed in amber on the EGT indicator?

Answer 4

the ENG FAIL alert is displayed in amber on the EGT indicator when the respective engine is operating at a condition below sustainable idle (NG (50 percent N2) and the engine start lever is in the idle position

Question 5

What would remove the amber ENG FAIL alert displayed on an EGT indicator?

Answer 5

The alert remains active until the engine recovers, the engine start lever is moved to CUTOFF, or the engine fire warning switch is pulled

Question 6

How does the EEC control thrust in the normal mode?

Answer 6

The EEC senses flight conditions and bleed air demand based on autothrottle and/or flight deck crew inputs to automatically set engine thrust

Question 7

When does the EEC automatically switch to soft alternate mode?

Answer 7

If required signals are not available to operate in the normal mode, the EEC automatically changes to soft alternate mode.

Question 8

What indication on the engine panel would alert the crew that automatic switching into the soft alternate mode has occurred?

Answer 8

The ALTN switch illuminates and the ON indication remains visible

Question 9

How does the EEC in soft alternate mode control the engine?

Answer 9

The EEC uses last valid flight conditions to define engine parameters, which allows the mode change to occur with no immediate change in engine thrust

Question 10

What is the indication on the EEC switch on the Engine Panel if hard alternate mode is manually selected?

Answer 10

When ALTN is selected manually, the ON indication is blanked

Question 11

What is the effect on the EECs with a loss of either DEU (NG) or either DPC (MAX)

Answer 11

Loss of either DEU (NG), DPC (MAX) results in loss of signal to both EECs. The EEC ALTN light will illuminate and each EEC reverts to the soft alternate mode to prevent the engines from operating on a single source of data

Question 12

The hard alternate mode has what effect on thrust?

Answer 12

Hard alternate mode thrust is always equal to or greater than normal mode thrust for the same lever position. Thrust protection is not provided in the hard alternate mode and max rated thrust is reached at a thrust lever position less than full forward

Question 13

How long must you run the APU before using it as a bleed air source?

Answer 13

2 minutes

Question 14

When accomplishing the TERMINATING checklist, how long must you wait to turn the battery off after the APU GEN OFF BUS light extinguishes?

Answer 14

NG (2 minutes)

MAX (5 minutes)

Question 15

What is a consideration for APU use during deicing/anti-icing

Answer 15

If not required, the APU should be shut down to eliminate the possibility of deicing/anti-icing fluid entering the APU inlet, which may cause erratic operation or damage to the APU

Question 16

From which side of the fuel manifold does the APU draw fuel?

Answer 16

Fuel for start and operation of the APU comes from the left side of the fuel manifold when AC fuel pumps are operating. If the AC fuel pumps are not operating, the APU suction feeds from the No. 1 tank

Question 17

When the APU is the only source of electrical power, what is the difference between load shedding on the ground and in flight?

Answer 17

On the ground, the APU will attempt to carry full electric load. If an overload condition is sensed, the APU sheds galley busses and main busses until the load is within limits. In flight, all galley busses and main busses are automatically shed.

Question 18

Is engine shutdown required for flap area contamination removal?

Answer 18

Yes

Question 19

The MAX has two additional alerts on the engine display per engine. What are they?

Answer 19

THRUST and FUEL FLOW

Question 20

On the MAX, what does the FUEL FLOW alert indicate?

Answer 20

Illuminated (amber)
Steady: engine fuel flow is abnormally high when compared to FMC expected fuel flow

Blinking: with fuel flow abnormally high, the alert and entire block will blink for 10 seconds and then the alter will remain steady until the condition no longer exists

Question 21

In the MAX, what does the THRUST alert indicate?

Answer 21

Illuminated (amber)

Steady:
-the thrust is more than commanded thrust
OR
-the thrust is less than commanded thrust
-displayed in conjunction with amber N1

Blinking- with a condition of more than or less than commanded thrust. The alert and entire block will blink for 10 seconds and the alert will remain steady until the condition no longer exists

Question 22

In the MAX, what safety feature of the EEC protects against exceedance of engine design limits?

Answer 22

Electronic Overspeed System (EOS). If an uncontrollable N2 overspeed condition is detected, the EEC automatically shuts off fuel to the affected engine. The amber ENG FAIL light will illuminate when N2 falls below the schedule N2 idle speed.

Question 23

In the MAX, what indication would you expect to see if the Electronic Overspeed System activated?

Answer 23

the amber ENG FAIL alert illuminates. THRUST alert may or may not appear

Question 24

How does the EEC provide flameout protection?

Answer 24

An auto-relight capability is provided for flameout protection. Whenever the EEC detects an engine flameout, both igniters are activated. A flameout is detected when an uncommanded rapid decrease in N2 occurs or N2 is below idle RPM

Question 25

In the NG, what does a reverser light indicate?

Answer 25

-Isolation valve or thrust reverser position control valve not in commanded position
-one or more thrust reverser sleeves are not in commanded position
-auto-restow circuity has been activated
-a failure has been detected in the synchronization shaft lock circuitry

Question 26

The MAX has 3 different reverser amber lights on the engine panel. What does the REVERSER COMMAND light indicate?

Answer 26

Amber: the reverse thrust lever is not in the down position in flight

Question 27

What does the illumination of the REVERSER AIR/GND amber light indicate?

Answer 27

The air/ground thrust reverser logic has failed

Question 28

What does illumination of the REVERSER LIMITED amber light indicate?

Answer 28

On the ground: a fault has occurred in the thrust reverser system

in flight: a fault in the thrust reverser system limits reverse thrust. Thrust reverser will not deploy or reverse thrust will be limited to idle

Question 29

In the NG, what does an illuminated MAINT light on the APU control panel indicate?

Answer 29

APU maintenance problem exists.
-The APU may be operated
-Light is disarmed when APU switch is OFF

Question 30

in the MAX, what does the DOOR light on the APU panel indicate when illuminated?

Answer 30

Illuminated (AMBER): APU door is not in commanded position:
-APU door is open when APU is shut down (in air or on ground)
In flight: door is not in the in-flight position
On ground: door is not in ground position