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Note: The APU > LOW OIL QUANTITY >@BCD MAINT light
indicates that the oil quantity is low. Advise maintenance that the
tank should be serviced. The APU may be operated while the
APU LOW OIL QUANTITY/MAINT light is illuminated.
737
Flight Manual Continental
Sec. 3 Page 15
Rev. 11/15/02 #41
Using APU For Air Conditioning
APU ................................................................................................ON BUSSES
APU generator connected to busses.
Cabin Temperature Selectors ............................................................... AUTO
Set for desired temperature.
Isolation Valve Switch...........................................................>>@ AUTO
BCD OPEN
APU Bleed Air Switch..................................................................................ON
>>@ Left or Right Air Conditioning
Pack Switch..................................................................... AUTO or HIGH
BCD Air Conditioning Pack Switch(es)..................... AUTO or HIGH
Heating
One-pack operation from the APU is satisfactory for normal heating on the
ground. Under extremely cold conditions, both packs may be used for more
rapid heating.
During right pack operation only, under cold conditions, if the left PACK TRIP OFF
light illuminates, position the recirculation fan OFF until the cabin temperature
stabilizes.
Cooling
>>@ When cooling the aircraft on the ground with the APU as the only
source of pneumatic air, use one pack only. Set cabin temperature selector at
AUTO NORMAL (straight up). Open all flight deck vents.
Sec. 3 Page 16
Rev. 11/15/02 #41 Continental
737
Flight Manual
Operating With APU Generator and/or Pneumatics Inoperative
Caution: If an external air cart is used, the air cart should be placed on the
opposite side of the aircraft from the engine being started. After
one engine has been started, the air cart should be removed from
the vicinity of the aircraft.
With the APU Generator Inoperative, but APU Pneumatics Available:
Engine Start: Use external electrical power or BATTERY START checklist.
Start No. 1 engine first.
Start No. 2 engine using normal procedures.
Refueling: Use normal procedures with external electrical power or refer
to REFUELING WITH BATTERY ONLY checklist.
With APU Pneumatics Inoperative, but APU Generator Available:
Engine Start: Use external air cart or air bottle to start either engine. Start the
other engine using ENGINE CROSSBLEED START checklist.
Refueling: Normal Procedures.
With APU Generator and Pneumatics Inoperative (External Electric Power Not
Available):
Dispatch: Do not dispatch to an airport that does not have the required
engine starting equipment. Because of safety considerations, an
engine should not be left running during a turnaround.
Engine Start: Use BATTERY START checklist with the external air cart or
air bottle.
Start No. 1 engine first.
Start No. 2 engine using ENGINE CROSSBLEED START
checklist.
During Battery Start, if the isolation valve does not open, start
No. 2 engine using external air only after ensuring safety of
ground personnel. It is preferred to wait for external electrical
power rather than to start No. 2 engine with external air and
battery.
Takeoff: If takeoff will be made in the engine bleeds OFF configuration,
refer to UNPRESSURIZED TAKEOFF checklist.
Refueling: Refer to REFUELING WITH BATTERY ONLY checklist.
737
Flight Manual Continental
Sec. 3 Page 17
Rev. 11/15/02 #41
Using Ground Preconditioned Air
The passenger cabin and flight deck may be air conditioned by attaching a
preconditioned air source to the ground service connection on the underside of
the fuselage. This air goes directly into the supply duct manifold for distribution
throughout the aircraft.
Caution: Possible supply duct manifold damage may occur when APU air
and ground preconditioned air are being supplied to the aircraft
simultaneously.
To avert possible damage to the ducting system(s) the following procedures will
be followed:
· When arriving at an aircraft with preconditioned air being supplied, the
APU Bleed Air Switch and Air Conditioning Pack Switch will not be
opened or turned on until the preconditioned air has been removed.
· If the APU is supplying air to a Pack at the gate and then preconditioned air
is applied, the APU Bleed Air Switch and Air Conditioning Pack
Switch(es) must be turned OFF.
Using Pneumatic Air Cart
Caution: The battery switch should always be ON when using the aircraft air
conditioning system since the protective circuits are DC. This
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