Supplementary Procedures -Electrical 737 Flight Crew Operations Manual
When the APU GEN OFF BUS light is illuminated: APU GENERATOR bus switches - ON Verify that the SOURCE OFF lights are extinguished. Verify that the TRANSFER BUS OFF lights are extinguished.
Verify that the APU MAINT light is extinguished.
Verify that the APU LOW OIL PRESSURE light is extinguished.
Verify that the APU FAULT light is extinguished.
Verify that the APU OVERSPEED light is extinguished.
Wheel well fire warning system ................................................... Test

Test switch – Hold to OVHT/FIRE Verify fire warning bell sounds, master FIRE WARN lights, MASTER CAUTION lights and OVHT/DET annunciator illuminate.
 Fire warning BELL CUTOUT switch – Push
Verify that the master FIRE WARN lights extinguish.
Verify that the fire warning bell cancels.
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
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Electrical 737 Flight Crew Operations Manual

Standby Power Test YA613 - YA722, YA809 - YK104
Battery switch .................................................................................... ON AC–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 +/-2 volts Frequency meter.............................................................................Check Check frequency meter for normal indication: 400 +/- 10 CPS. DC meter selector..............................................................................BAT Check DC voltmeter for normal indication: 24 +/- 2 volts. Check DC ammeter for discharge indication: a negative value. DC meter selector................................................................... AUX BAT Check DC voltmeter for normal indication: 24 +/- 2 volts. Check DC ammeter for discharge indication: a negative value. STANDBY POWER switch .......................................................... AUTO
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Electrical
737 Flight Crew Operations Manual
GRD PWR switch or APU GEN No. 1 and No. 2 switches...............ON

Note: It may take up to 3 minutes for CDS displays to recover when power is interrupted for more than 2 seconds on the ground.
Copyright . The Boeing Company. See title page for details.
September 29, 2005  SP.6.5
Supplementary Procedures -Electrical 737 Flight Crew Operations Manual

Intentionally
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Copyright . The Boeing Company. See title page for details.
SP.6.6  March 28, 2005

737 Flight Crew Operations Manual

Battery Start
(With APU bleed or ground air available)
Maintenance documents ................................................................ Check

FLIGHT DECK ACCESS SYSTEM switch.................................................................................. Guard closed BATTERY switch ............................................................... Guard closed ELECTRIC HYDRAULIC PUMPS
switches ............................................................................................ OFF
LANDING GEAR lever .....................................................................DN
Verify that the green landing gear indicator lights are illuminated.
Verify that the red landing gear indicator lights are extinguished.
FLAP lever.......................................................................................... Set
　
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