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Caution: Do not operate the APU. An APU fire would not be detected
and the APU would continue to run.
* * * *
>@BCD APU FAULT
The APU FAULT light illuminated indicates an APU fault. The APU shuts down
automatically.
APU Switch..................................................................................................OFF
The air inlet door and fuel shutoff valve closes. If the APU FAULT light
extinguishes after 5 minutes, additional restarts may be attempted.
* * * *
ENGINES, APU
Sec. 2.7 Page 2
Rev. 11/15/02 #41
Continental
737
Flight Manual
APU FIRE (INFLIGHT)
This condition is recognized by the fire warning bell ringing and the APU FIRE
warning light illuminated.
APU Fire Handle ...............................................................PULL & ROTATE
Rotate to the stop and hold until APU BOTTLE DISCHARGE light illuminates.
To manually unlock the APU fire handle, press the override button (located
under the handle) and pull.
Illumination of the APU FIRE warning light causes automatic shutdown of the
APU and unlocks the APU fire warning handle. Pulling the handle manually
backs up the APU shutdown feature, closes the fuel and APU bleed air valves,
closes the APU inlet door, trips the generator field, and arms the fire
extinguisher system.
Rotation in either direction discharges the fire extinguisher bottle.
APU Switch..................................................................................................OFF
IF The APU FIRE Warning Light Remains Illuminated:
Land At The Nearest Suitable Airport.
* * * *
737
Flight Manual
Continental
ENGINES, APU
Sec. 2.7 Page 3
Rev. 11/15/02 #41
APU GEN OFF BUS LIGHT
FAILS TO ILLUMINATE DURING START
If after the starter engagement, the APU GEN OFF BUS light fails to illuminate
within the time limit of the starter motor, the APU may have failed to attain
starter cutout speed. If ignition has occurred, a hung start may be in progress.
APU Switch..................................................................................................OFF
The OVERSPEED light may illuminate. The air inlet door and fuel shutoff
valve will close.
EGT.......................................................................................................CHECK
Check for a decreasing indication if ignition has occurred.
DC Ammeter ........................................................................................CHECK
If the aircraft is electrically powered, the ammeter will show a large
positive reading. If the battery is the only source of power, the ammeter
will show a negative reading.
* * * *
> APU HIGH OIL TEMP
The APU HIGH OIL TEMP light illuminated indicates APU oil temperature is
excessive. The APU shuts down automatically.
APU Switch..................................................................................................OFF
The air inlet door and fuel shutoff valve closes. The APU HIGH OIL TEMP light
extinguishes.
* * * *
ENGINES, APU
Sec. 2.7 Page 4
Rev. 11/15/02 #41
Continental
737
Flight Manual
APU LOW OIL PRESSURE
The APU LOW PRESSURE light illuminated indicates the APU oil pressure is low.
The APU shuts down automatically.
APU Switch..................................................................................................OFF
The air inlet door and fuel shutoff valve closes. The APU LOW OIL PRESSURE
light extinguishes.
* * * *
APU OVERSPEED
The APU OVERSPEED light illuminated indicates one of the following situations:
the APU has automatically shut down due to the APU RPM limit being
exceeded, an APU start has been manually aborted prior to the APU reaching
normal operating speed, or if illuminated during a normal APU shutdown, the
overspeed shutdown protection feature has failed a self-test.
APU Switch..................................................................................................OFF
The APU inlet door and fuel shutoff valve closes. Do not attempt
subsequent starts unless the light illuminated as the result of an aborted
start.
Note: If the OVERSPEED light illuminated due to RPM limit being
exceeded or self-test failure, maintenance action is required.
* * * *
APU STARTER FAILS TO ENGAGE
If the APU fails to start because the starter did not engage (no indication on the
DC ammeter, selector BAT), place the APU switch to OFF and wait 20 seconds to
allow the air inlet door to recycle.
* * * *
737
Flight Manual
Continental
ENGINES, APU
Sec. 2.7 Page 5
Rev. 11/15/02 #41
　
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