MAX - Engines APU

Which system regulates the engine?

Electronic Engine Control (EEC)

How many channels does each EEC have?

Two

What does the EEC do?

Monitors autothrottles and flight crew input to automatically set engine thrust

What is the indication an EEC is operating in normal mode?

White ON lights only lights illuminated on the associated EEC switch

What are the indications of EEC hard alternate and soft alternate modes?

Soft Mode - ALTN and ON

Hard Mode (via thrust to idle) - ALTN and ON

Hard Mode (manual selection) - ALTN

The EECs provide redline overspeed protection for which engine parameters(s)?

N1 and N2 in both normal and alternate modes

When do the EECs select (3) and deselect approach idle?

• Flaps 15 or greater

OR

• Flaps >0 and engine anti-ice

If fault prevents EEC from receiving flap or anti-ice signal

• 19,000’ MSL

DESELECTED

• After touchdown - ground minimum idle

What does the ENGINE CONTROL light indicate and when is it armed?

• A non-dispatchable fault in EEC

Operates when:

• Engine is operating

AND

• on ground

AND

• below 80 kts prior to takeoff OR 30 seconds after touchdown

When is the ENG FAIL alert displayed? When does it extinguish?

On the EGT indicator:

• Below sustainable idle (62%)

AND

• Engine start lever is in the IDLE position

Remains until:

• Engine recovers

• Start lever moved to CUTOFF

• Fire switch is pulled

How are the secondary engine instruments toggled?

ENG selected on MFD panel (toggled)

How are EGT redline exceedances indicated?

EGT - amber caution limit

Red or amber line

Digit readout, box, needle, and indicator change color to red or amber.

How is an EGT exceedance displayed after engine shutdown?

After engine shutdown, a box the color of the exceedance (red or amber) displays around digital readout where the exceedance occurred

How is the N1/SPD REF SET page displayed on the Max Display System?

INFO on the MFD panel

What does the THRUST crew alert on the Engine Display indicate?

• Thrust is more or less than commanded

• N1 command sector illuminates AMBER

What are the indications of reverse thrust on the Engine Display? (2)

REV (amber) - thrust reverser moved from stowed position

REV (green) - thrust reverser is deployed

What does selecting FUEL USED display?

• Fuel used since the last reset - 10 seconds

THEN

• Fuel flow

What does the illumination of the FUEL FLOW crew alert indicate?

Fuel flow abnormally high compared to the FMC expected fuel flow

What does the illumination of the OIL FILTER BYPASS light indicate?

Impending bypass of oil supply filter

Which engine start ignitor is available on standby power?

• Right igniter plug

• *We start the day on IGN R to verify standby AC bus

The auto-relight function of the Engine Start System is available when the engine start switches are in which position(s)?

Any position

What does MOTORING on the N2 indicator indicate?

• Bowed Rotor Motoring (BRM)

  • Straightens N1, N2 rotor shafts which bow due to thermal buildup after shut down

  • 6-90 seconds

  • Ground only

  • N2 between 18% and 24%

Which start malfunction(s) do the EECs monitor for during engine start?

• Ground start:

  • hot starts

  • wet starts

  • engine stalls

  • EGT start limit exceedance

• In-flight start:

  • No protections

What happens if a hot start or compressor stall is detected during engine start?

• Rapid rise in EGT, EGT approaching start limit, or compressor stall

  • Box surrounding EGT digital readout flashes white

  • EEC turns off ignition

  • EEC shuts off fuel

• Flashing white box resets when start lever moved to CUTOFF

What does the illumination of the REVERSER LIMITED light indicate?

Fault in thrust reverser system limits reverser thrust

Thrust reverser will not deploy or reverse thrust limited to idle if commanded

Illuminates on ground when malfunction has occurred

What does the illumination of the REVERSER COMMAND light indicate?

• Reverse thrust lever not in down position in flight

What does the APU provide?

Bleed Air

AC electrical power

Does the APU require the BAT switch to be on to operate?

• YES

• APU operation requires:

  • BAT switch ON

  • APU fire switch IN

  • APU fire control handle IN

How long should the APU run after illumination of the APU GEN OFF BUS light before opening the APU bleed valve?

• Two minutes before using as bleed air source

• Extends service life of APU

How long after APU switch selected OFF before selecting BAT switch OFF?

• Five minutes after APU GEN OFF BUS light extinguishes

• Allows adequate time for APU inlet door to fully close

What will cause the automatic shutdown of the APU? (7)

Automatic shutdown protection is provided for:

• Overspeed

• Low oil pressure

• High oil temperature

• EGT exceedance

• APU fire

• Fuel Control Unit failure

• System faults monitored by ECU