Engines and APU Flashcards
On initially receiving power, what format are the engine instruments displayed?
NG: compact engine display
MAX: secondary engine indications
On the NG, what format is required for the engine instruments before the engine is started?
Set engine displays to the compact format
On the MAX, which DU is required to display the engine instruments?
Set the engine displays to the Captain’s inboard DU
When is the engine failure alert, ENG FAIL, displayed in amber on the EGT indicator?
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
What would remove the amber ENG FAIL alert displayed on an EGT indicator?
The alert remains active until the engine recovers, the engine start lever is moved to CUTOFF, or the engine fire warning switch is pulled
How does the EEC control thrust in the normal mode?
The EEC senses flight conditions and bleed air demand based on autothrottle and/or flight deck crew inputs to automatically set engine thrust
When does the EEC automatically switch to soft alternate mode?
If required signals are not available to operate in the normal mode, the EEC automatically changes to soft alternate mode.
What indication on the engine panel would alert the crew that automatic switching into the soft alternate mode has occurred?
The ALTN switch illuminates and the ON indication remains visible
How does the EEC in soft alternate mode control the engine?
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
What is the indication on the EEC switch on the Engine Panel if hard alternate mode is manually selected?
When ALTN is selected manually, the ON indication is blanked
What is the effect on the EECs with a loss of either DEU (NG) or either DPC (MAX)
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
The hard alternate mode has what effect on thrust?
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
How long must you run the APU before using it as a bleed air source?
2 minutes
When accomplishing the TERMINATING checklist, how long must you wait to turn the battery off after the APU GEN OFF BUS light extinguishes?
NG (2 minutes)
MAX (5 minutes)
What is a consideration for APU use during deicing/anti-icing
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
From which side of the fuel manifold does the APU draw fuel?
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
When the APU is the only source of electrical power, what is the difference between load shedding on the ground and in flight?
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.
Is engine shutdown required for flap area contamination removal?
Yes
The MAX has two additional alerts on the engine display per engine. What are they?
THRUST and FUEL FLOW
On the MAX, what does the FUEL FLOW alert indicate?
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
In the MAX, what does the THRUST alert indicate?
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
In the MAX, what safety feature of the EEC protects against exceedance of engine design limits?
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.
In the MAX, what indication would you expect to see if the Electronic Overspeed System activated?
the amber ENG FAIL alert illuminates. THRUST alert may or may not appear
How does the EEC provide flameout protection?
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
In the NG, what does a reverser light indicate?
-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
The MAX has 3 different reverser amber lights on the engine panel. What does the REVERSER COMMAND light indicate?
Amber: the reverse thrust lever is not in the down position in flight
What does the illumination of the REVERSER AIR/GND amber light indicate?
The air/ground thrust reverser logic has failed
What does illumination of the REVERSER LIMITED amber light indicate?
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
In the NG, what does an illuminated MAINT light on the APU control panel indicate?
APU maintenance problem exists.
-The APU may be operated
-Light is disarmed when APU switch is OFF
in the MAX, what does the DOOR light on the APU panel indicate when illuminated?
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
