737 Flight Crew Operations Manual
Supplementary Procedures -
Electrical
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
SP.6.2 D6-27370-866-EGP
Verify that the OVHT/DET annunciator is illuminated.
Verify that the FAULT light is illuminated.
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.
YW273, YW274
Verify that the engine No. 1 and engine No. 2 start lever lights stay
illuminated.
Verify that the ENG 1 OVERHEAT and ENG 2 OVERHEAT
lights stay illuminated.
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
Note: If extended APU operation is needed on the ground and
the airplane busses are powered by AC electrical power,
position an AC powered fuel pump ON. This will extend
the service life of the APU fuel control unit.
September 15, 2016
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