737 MAX Flight Crew Operations Manual
Engines, APU -
Controls and Indicators
MN-FLT-OH-201
7.10.23
APU
1
APU Door (DOOR) Light
Illuminated (amber) – APU door is not in the commanded position:
• APU door is open when APU is shut down (in air or on ground)
• in flight - door is not in flight position
• on ground - door is not in ground position.
2
APU OVERSPEED Light
Illuminated (amber) –
• APU RPM limit has been exceeded resulting in an automatic shutdown
• overspeed shutdown protection feature has failed a self–test during a
normal APU shutdown
• if light is illuminated when APU switch is placed to OFF, light
extinguishes after 5 minutes
• light is disarmed when the APU switch is in OFF position.
SPEED
OVER
PRESSURE
LOW OIL
DOOR
FAULT
APU
ON
START
OFF
APU
5
FORWARD OVERHEAD PANEL
1
2
3
4
March 1, 2021
