737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Electrical
SP.6.2
MN-FLT-OH-201
If the FAULT light fails to illuminate, the fault monitoring
system is inoperative.
Verify that the APU DET INOP light is illuminated.
Do not operate the APU if the APU DET INOP light fails to
illuminate.
TEST switch – Hold to OVHT/FIRE
Verify that the fire warning bell sounds.
Verify that the master FIRE WARN lights are illuminated.
Verify that the MASTER CAUTION lights are illuminated.
Verify that the OVHT/DET annunciator is illuminated.
Master FIRE WARN light – Push
Verify that the master FIRE WARN lights are extinguished.
Verify that the fire warning bell cancels.
Verify that the engine No. 1, APU and the engine No. 2 fire
switches stay illuminated.
Verify that the ENG 1 OVERHEAT and ENG 2 OVERHEAT
lights stay illuminated.
Note:
The WHEEL WELL fire warning light on the overheat
and fire protection panel may or may not illuminate when
testing on DC electrical power only. For accurate testing,
do the wheel well fire detection system test after AC
electrical power is established.
EXTINGUISHER TEST switch – Check
TEST Switch - Position to 1 and hold
Verify that the three green extinguisher test lights are
illuminated.
TEST Switch - Release
Verify that the three green extinguisher test lights are
extinguished.
Repeat for test position 2.
APU - Start
March 1, 2021
