NOT IN USE LIGHT
IN USE FWD P19 EXTERNAL POWER PANEL
737 GENERAL - EXTERNAL POWER APPLICATION
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- APU FIRE PROTECTION THIS PAGE INTENTIONALLY LEFT BLANK
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737 GENERAL -- APU FIRE PROTECTION General
You use the overheat/fire protection panel to do the APU fire protection test and to extinguish an APU fire from the flight compartment.
You use the APU ground control panel on the main wheel well to turn off the APU and extinguish an APU fire from outside the airplane.
Fire Protection System Test
Do a test of the APU fire protection system before you start the APU. The controls to do the test are on the overheat/fire protection panel.
Before you do the fire protection system test, alert the ground crew. The APU fire warning horn comes on during the test.
To start the test, momentarily put the TEST switch to FAULT/INOP. The FAULT and APU DET INOP lights come on.
Momentarily put the TEST switch to OVHT/FIRE. Make sure these indications come on:
-APU fire handle light on the overheat/fire
protection panel
-FIRE WARN lights on the glareshield
-Fire bell from the aural warning unit.
737-600/700/800/900 TRAINING MANUAL
Make sure the APU BOTTLE DISCHARGED light is off. This light is normally off to show a charged APU fire extinguishing bottle.
To do a test of the APU squib, put the EXT TEST switch to position 1 or 2. If the squib is good, the APU squib light comes on.
Flight Compartment Operation
If the fire detection system detects an APU fire, these are the results in the flight compartment:
-APU fire handle light on the overheat/fire
protection panel
-APU fire handle unlocks
-FIRE WARN lights on the glareshield
-Fire bell from the aural warning unit
-APU shuts down.
To stop the fire bell, use the bell cutout switch or the master fire warning lights.
To extinguish the fire, use the APU fire handle. Pull up on the APU fire handle and then turn the handle to discharge the APU fire bottle.
Main Wheel Well Operation
In the main wheel well, you hear an intermittent horn if the fire protection system detects a fire. The APU fire warning light on the APU ground control panel flashes.
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- APU FIRE PROTECTION To stop the APU warning horn, use the HORN CUTOUT
switch.
To extinguish the fire, pull down the APU ground control panel fire control handle to arm the extinguisher. Use the BOTTLE DISCHARGE switch to discharge the extinguisher.
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737-600/700/800/900 TRAINING MANUAL
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APU BOTTLE
HORN DISCHARGE
CUTOUT SWITCH
SWITCH
APU
FIRE
CONTROL
1.PULL HANDLE DOWN 2.DISCHARGE BOTTLE
FLT CONT
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FIRE CAUTIONWARN IRS a
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APU REMOTE FIRE
HORN BOTTLE
WARNING LIGHT (2) ANNUNCIATOR
CUTOUT
SWITCH HANDLE
DISCHARGE
LIGHT (2) APU FIREAPU BOTTLE WARNING LIGHT
FIRE PROTECTION DISCHARGE BELL CUTOUT TEST SWITCH INDICATOR SWITCH
OVHT DET OVHT DET
WHEEL
GROUND CONTROL
BELL CUTOUT
WELL r
L BOTTLEa
R BOTTLEa
PANEL (P28)
DISCHARGED
DISCHARGED
AB AB
ENGINES
DISCH DISCH DISCH
FAULT T
a
NORMAL NORMAL E
L R
LR
E12XENG 1a ENG 2a SAPU DET TOVERHEAT OVERHEAT TR
EXT TEST
INOP aF
TEST
SWITCH
IO F
L
FIRE SWITCHESA
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APU BOTTLE
(FUEL SHUTOFF)
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PULL WHEN ILLUMINATED
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a
L
LOCK OVERRIDE: PRESS g
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r r BUTTON UNDER HANDLE r
T
APU
APU
OVERHEAT/FIRE PROTECTION PANEL (P8) SQUIB
APU FIRE HANDLE
LIGHT 737 GENERAL - APU FIRE PROTECTION
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- APU OPERATION THIS PAGE INTENTIONALLY LEFT BLANK
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737 GENERAL -- APU OPERATION General
When you do maintenance, you start the APU to supply electrical power and bleed air.
The APU switch lets you control the APU. The APU electronic control unit (ECU) controls the system operation.
The APU indicator panel shows system status.
Start
The battery switch must be ON before you can start and operate the APU.
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