737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Electrical
SP.6.4
MN-FLT-OH-201
Verify that the WHEEL WELL fire warning light is
illuminated.
#Electrical Power Down
This procedure assumes the Secure procedure is complete.
APU switch and/or GRD POWER switch ........................................OFF
If APU was operating:
Delay approximately 2 minutes after the APU GEN OFF BUS
light extinguishes before placing the BATTERY switch OFF.
BATTERY switch..............................................................................OFF
Standby Power Test
YA201 - YA221, YA571 - YA657, YB104 - YK653, YL621, YL806 - YN112, YN701 - YV671
Battery switch .................................................................................... ON
AC and DC meter selectors.................................................. STBY PWR
If APU generator is on–line:
APU GEN No. 1 switch ..........................................................OFF
APU GEN No. 2 switch ..........................................................OFF
If ground power is on–line:
GRD PWR switch ...................................................................OFF
STANDBY POWER switch ..............................................................OFF
Check STANDBY PWR OFF light illuminated.
AC–DC voltmeters ............................................................................Zero
STANDBY POWER switch ..............................................................BAT
Check STANDBY PWR OFF Light extinguished.
AC–DC voltmeters .........................................................................Check
AC voltmeter 115 +/-5 volts
DC voltmeter 24 +/-4 volts
Frequency meter.............................................................................Check
Check frequency meter for normal indication: 400 +/- 5 CPS.
March 1, 2021