Fire Protection -Controls and Indicators 737 Flight Crew Operations Manual

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) -
. Both loops in one or both cargo compartments have 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.

Cargo Fire ARM Switches YA686, YA687, YA801 - YA809, YD651 - YD655
PUSH -
.
FWD ARMED - extinguisher armed for the forward cargo compartment

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

Cargo Fire ARM Switches YA613, YA626, YA721, YA722, YC153 - YC413, YK101 - YK104
PUSH -
.
FWD ARMED - extinguisher armed for the forward cargo compartment

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

Note:  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.
Copyright . The Boeing Company. See title page for details.
Fire Protection -Controls and Indicators 737 Flight Crew Operations Manual

Cargo Fire Bottle Discharge (DISCH) Light YA686, YA687, YA801 - YA809, YD651 - YD655
Illuminated (amber) - indicates the extinguisher bottle has discharged

Cargo Fire Bottle Discharge (DISCH) Light YA613, YA626, YA721, YA722, YC153 - YC413, YK101 - YK104
Illuminated (amber) - indicates that either extinguisher bottle has discharged

Cargo Fire Discharge (DISCH) Switch YA686, YA687, YA801 - YA809, YD651 - YD655
PUSH - if system is armed, discharges the extinguisher bottle.

Cargo Fire Discharge (DISCH) Switch YA613, YA626, YA721, YA722, YC153 - YC413, YK101 - YK104
PUSH - if system is armed, discharges the first extinguisher bottle. The timer is set for 60 minutes to discharge the second extinguisher bottle.
Master Fire Warning Light

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

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

.
extinguishes both master FIRE WARN lights

.
silences fire warning bell

.
silences remote APU fire warning horn

.
resets system for additional warnings.

Note:  Pushing fire warning bell cutout switch on overheat/fire protection panel results in same actions.
Copyright . The Boeing Company. See title page for details.
8.10.6   June 1, 2005

Fire Protection -Controls and Indicators 737 Flight Crew Operations Manual
APU Ground Control Panel

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

APU Fire Control Handle
Up – normal position. 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.

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.

Copyright . The Boeing Company. See title page for details.
Fire Protection -Controls and Indicators
737 Flight Crew Operations Manual
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 well sounds.
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
1 TEMPERATURE INDICATOR Placard
White – normal condition.
Black – exposed to high temperatures.
　
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