Extinguisher Test (EXT TEST) Lights
Illuminated (green) – EXT TEST switch is positioned to 1 or 2 and circuit continuity is normal.
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8.10.4   June 4, 2004

Fire Protection -Controls and Indicators
Cargo Fire Panel

As installed
AFT ELECTRONIC PANEL

Extinguisher (EXT) Test Lights
Illuminated (green) - Cargo Fire TEST switch is pushed and fire bottle discharge
squib circuit continuity is normal.

Detector Select (DET SELECT) Switches
NORM - detection loop A and B are active.
A - detection loop A is active.
B - detection loop B is active.

DETECTOR FAULT Light
Illuminated (amber) - one or more detectors in the related loop(s) has failed.

Cargo Fire TEST Switch
PUSH - tests circuits for both forward and aft cargo fire detector loops and suppression system.
Note: See Cargo Fire System Tests in Section 20.
Fire Protection -Controls and Indicators 737 Operations Manual

Cargo Fire ARMED Switches
PUSH -
.
FWD ARMED - extinguisher armed for the forward cargo compartment

.
AFT ARMED - extinguisher armed for the aft cargo compartment.

Note:  On airplanes with ETOPS configuration, if the first bottle has discharged and the system remains armed, the second bottle discharge is inhibited upon landing. The second bottle discharge timer is disabled when the system is disarmed.

Cargo Fire (FWD/AFT) Warning Lights
Illuminated (red) -
.
at least one detector in each loop detects smoke

.  
with power failed in one loop, at least one detector on the remaining loop
detects smoke.

Note: Master FIRE WARN lights illuminate and fire warning bell sounds.

Cargo Fire Bottle Discharge (DISCH) Light
Illuminated (amber) - . on some airplanes, indicates the extinguisher bottle has discharged . on airplanes with ETOPS configuration, indicates that either extinguisher
bottle has discharged.

Cargo Fire Discharge (DISCH) Switch
PUSH - if system is armed, discharges the extinguisher bottle. On airplanes with ETOPS configuration, the timer is set for 60 minutes to discharge the second extinguisher bottle.
Master Fire Warning Light

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8.10.6   June 4, 2004
Fire Protection -

Master Fire Warning (FIRE WARN) Light
Illuminated (red) – indicates a fire warning (or system test) in engine, APU, main gear wheel well, or cargo compartments (on some airplanes)
.
fire warning bell sounds

.
if on ground, remote APU fire warning horn sounds. Push –

.
extinguishes both master FIRE WARN lights

.
silences the fire warning bell

.
silences the remote APU fire warning horn

.
resets the system for additional warnings.

Note:  Pushing fire warning bell cutout switch on overheat/fire protection panel results in same actions.
APU Ground Control Panel

APU BOTTLE DISCHARGE Switch
(spring–loaded to the right and safetied.)
Left – discharges APU extinguisher.
Note: Armed only if APU fire control handle is pulled at this panel.

APU Fire Control Handle
Up – normal position.
Copyright . The Boeing Company. See title page for details.
Fire Protection -Controls and Indicators
737 Operations Manual
Down –
.
arms APU BOTTLE DISCHARGE switch (on this panel only)

.
closes APU fuel shutoff, bleed air valve and APU inlet door

.
trips generator control relay and breaker.

3 APU Fire Warning HORN CUTOUT Switch
Push –
.
silences fire alarm bell

.
silences APU fire warning horn

.
causes APU fire warning light to stop flashing but remain illuminated.

4 APU Fire Warning Light
Illuminated (red flashing) – indicates fire in APU.
Note:  Also, flight deck fire warning bell sounds and APU fire warning horn in main wheel wails.
Illuminated (red steady) – indicates APU fire warning HORN CUTOUT switch has been pushed following an APU fire indication.
Lavatory Fire
Lavatory Fire Extinguisher
1
180`F 200`F 230`F 250`F
BLACK WHEN EXPOSED
2 
BELOW LAVATORY SINK 
8.10.8  Copyright . The Boeing Company. See title page for details.   June 4, 2004 

Fire Protection -Controls and Indicators 737 Operations Manual

TEMPERATURE INDICATOR Placard
White – normal condition.
Black – exposed to high temperatures.
　
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