737 Flight Crew Operations Manual
Fire Protection -
Controls and Indicators
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8.10.6 D6-27370-866-EGP
4 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.
5 Cargo Fire ARM Switches
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.
6 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.
7 Cargo Fire Bottle Discharge (DISCH) Light
Illuminated (amber) - indicates that either extinguisher bottle has discharged
8 Cargo Fire Discharge (DISCH) Switch
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
September 15, 2016
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