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APU (If Available) ..............................>>@ START & ON BUS
BCD START & ON BUS(ES)
· With both busses OFF, only one APU start attempt is
recommended. The probability of a start is increased below
25,000 feet. Multiple start attempts deplete the battery and reduce
standby power capacity. APU starting may result in loss of IRS
alignment.
· >>@ If the APU is the only operating generator, connect
it to the No. 2 bus as it will power TR No. 3. (Selecting
Equipment Cooling Fan(s) to Alternate will restore color on EADI
and EHSI.) If the APU cannot be connected to the No. 2 bus,
connect it to the No. 1. bus.
(Continued)
ELECTRICAL
Sec. 2.6 Page 14
Rev. 11/15/02 #41
Continental
737
Flight Manual
IF One Or Both >>@ BUS OFF BCD SOURCE OFF
Lights Extinguish:
Bus Transfer Switch ................................................................ AUTO
>>@ This insures the transfers buses are powered.
Electric Hydraulic Pump Switches...........ON (ONE AT A TIME)
Positioning the pump switches ON one at a time prevents high
peak electrical loads.
IF Both Primary Attitude Displays Are Inoperative:
IRS Mode Selector Switches ...............................................ATT
Maintain straight and level, constant airspeed flight until
attitude display recovers (approximately 30 seconds).
Magnetic Heading..........................................................ENTER
Allows attitude function of IRS to be restored if starting the
APU causes the battery voltage to drop below the minimum
for IRS operation.
Heading may be entered on the POS INIT page or on the
overhead IRS display unit by selecting HDG/STS.
* * * *
IF Both >>@ BUS OFF BCD SOURCE OFF Lights Remain
ON:
All Exterior Lights.......................................................................OFF
Conserves battery power.
Avoid icing conditions.
Note: Flight in icing conditions may result in erroneous flight
instrument indications.
Land at the nearest suitable airport. The battery furnishes standby
power (up to 30 minutes depending on the condition of the battery and
the number of radio transmission).
OR
(Continued)
737
Flight Manual
Continental
ELECTRICAL
Sec. 2.6 Page 15
Rev. 11/15/02 #41
- - - - - PRIOR TO LANDING - - - - -
>>@ Standby Power Switch...........................................BAT
Notes: Ÿ BATTERY POWER ONLY (Approx 30 min.):
Ÿ Use headsets for communications.
Ÿ Flight directors, autopilots, autothrottles, and mode
control panel are inoperative.
Ÿ Hydraulic systems are operative but hydraulic panel
indicators and lights are inoperative.
Ÿ Stabilizer trim is manual only.
Ÿ Cabin pressure is manual DC only.
* * * *
BCD SOURCE OFF
The SOURCE OFF light indicates the respective transfer bus is not powered by the
last selected source.
Engine Generator Switch.............................................................................ON
IF BUS OFF SOURCE OFF Light Remains Illuminated:
APU (If Available) ....................................................START & ON BUS
Note: If the SOURCE OFF light is not associated with Engine Failure or
Shutdown and the DRIVE light is also illuminated accomplish the
DRIVE checklist.
* * * *
ELECTRICAL
Sec. 2.6 Page 16
Rev. 11/15/02 #41
Continental
737
Flight Manual
STANDBY POWER OFF
The STANDBY PWR OFF light illuminated indicates the >>@ AC standby
bus is not powered. BCD one or more of the following busses are
unpowered:
· AC standby bus
· DC standby bus
· Battery bus
Standby Power Switch ...............................................................................BAT
The standby busses are powered by the battery bus. A fully charged battery
will provide a minimum of 30 minutes of standby power.
IF Either Generator Bus Is Re-Established:
Standby Power Switch.....................................................................AUTO
* * * *
BCD TR UNIT
The TR UNIT light illuminated indicates one or more TRs has failed.
Do not use the AFDS approach mode.
Note: Autoland is not available.
* * * *
TRANSFER BUS OFF
The TRANSFER BUS OFF light indicates the related transfer bus is not powered.
>>@ Bus Transfer Switch ....................................OFF THEN AUTO
BCD Engine Generator Switch .....................................................ON
IF TRANSFER BUS OFF Light Remains Illuminated:
APU (If Available) ....................................................START & ON BUS
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