MD&TPRESSURE SW
S15  APU BOTTLE
M404 APUDISCHARGE SW
FIREMD&T
EXT(STA 1025)P28 APU GROUND CONTROL PANEL L10 APU BOTTLE DISCHARGE LIGHT
P8-1 ENGINE AND APU FIRE CONTROL PANEL
APU
FIRE
CONTROL

DISCHARGE PORT
1 PULL HANDLE DOWN
2 DISCHARGE BOTTLE
BOTTLE DISCHARGE
OVHT DET
S1 SQUIB WELL
OVHT DET
WHEELBELL CUTOUT
L BOTTLER BOTTLE
DISCHARGE DISCHARGE
R
S16
AA
AB AB
ENGINES NORMAL
FAULT
DISCH
DISCH NORMAL DISCH ET
A
XE
12S15
ENG 2
ENG 1
L RTS
APU DET
LR
OVERHEAT
BOTTLE

OVERHEAT
T
INOP
AR
A
HORN CUTOUT ADISCHARGE
L
TEST
GG A
F FIRE SWITCHES
APU BOTTLE
F
IO
(FUEL SHUTOFF)UDISCHARGED
NVI
A
PULL WHEN ILLUMINATEDL
R
G
OH
LOCK OVERRIDE: PRESS
E
PT
R R BUTTON UNDER HANDLE R
T
APU
TO APUL10 L11ENGINE SHROUD(UPPER) P8-1 ENGINE AND APU FIRE CONTROL PANEL
S10 INBD FWD
P28  APU REMOTE CONTROL PANELPRESSURE SWITCH
(RIGHT WHEEL WELL) SYSTEM
DISCHARGE INDICATOR

NOTES
(YELLOW DISC)APU FIRE EXTINGUISHER BOTTLE
1 PULL HANDLE TO ACTUATE THERMAL RELIEF
INDICATOR
(RED DISC)

FILLING PORTFIRE EXTINGUISHING BOTTLE
2
ROTATE HANDLE TO DISCHARGE
APU Fire Extinguishing System Simplified Schematic
Figure 1

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (3)  The APU bottle discharge light is connected to pressure switch. When the bottle pressure drops, the pressure switch closes, and the APU bottle discharge light illuminates.
 4.  APU Ground Control Panel (Fig. 1)________________________
 A.  The APU ground control panel is in the right wheel well. Components of the APU ground control panel are the APU fire light, fire switch, and bottle discharge switch. When a fire is detected in the APU compartment, the APU fire light comes on and a warning horn sounds. Pulling the fire switch shuts down the APU and arms the bottle discharge switch. Pressing the bottle discharge switch discharges the APU fire bottle.
 5.  Operation (Fig. 1)_________
 A.  When a fire is detected in the APU compartment, the APU fire switch handle unlocks, the APU fire switch handle light comes on, and the fire warning bell sounds. The red APU fire light on the APU ground control panel also comes on.
 B.  When the APU fire switch handle is pulled out, the APU automatically shuts down and the extinguishing bottle is armed; the APU generator field relay and generator circuit breaker are tripped; the APU fuel shut-off valve closes; the APU inlet door closes; and the bleed air valve closes.
 C.  When the APU fire switch handle is rotated in either direction (for at least one second), the squib is fired, rupturing the sealing diaphragm and releasing the extinguishing agent. The extinguishing agent flows from the bottle to the APU shroud. The pressure of extinguishing agent in the discharge line causes the yellow disc in the dischage indicator to be knocked out, showing the system has been actuated. When the bottle pressure approaches approximately 250 psi, the APU bottle discharge light illuminates, indicating the APU bottle is discharged and inactive.
 D.  APU Extinguishing System Test
 (1)  Squib Test
 (a)  Pressing the EXT TEST switch sends a signal to the squib. If the squib and circuit continuity are good, the APU extinguisher test light on the panel will come on.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 02 Page 3 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
APU FIRE EXTINGUISHING SYSTEM - TROUBLESHOOTING
1.  General
A.  Whenever the engine and APU fire control panel (P8-1) is removed and replaced, test the APU fire extinguishing system (Ref 26-21-51/501).
　
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