737 Flight Crew Operations Manual
Fire Protection -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
8.20.6 D6-27370-866-EGP
Cargo Compartment Fire Extinguishing
Two fire extinguisher bottles are installed in the air conditioning mix bay on the
forward wing spar. Detection of a fire in either the forward or aft compartment will
cause the FWD or AFT cargo fire warning light to illuminate. The extinguishers
are armed by pushing the appropriate cargo fire ARMED switch. Once armed, the
first bottle is discharged by pushing the cargo fire DISCH switch. This results in
the total discharge of the first bottle contents into the selected compartment. The
second bottle discharge is metered to discharge at a reduced flow into the selected
compartment. Discharge of the second bottle may be disabled if the system is
disarmed. The cargo fire DISCH light illuminates when a bottle is discharged. It
may take up to 30 seconds for the light to illuminate. On landing, if the first bottle
was discharged and the system remains armed, the second bottle discharge is
inhibited.
Cargo Fire Extinguisher Schematic
Lavatory Fire Protection
Lavatory fire protection consists of these systems:
• lavatory smoke detection
• lavatory fire extinguishing (heat activated).
Lavatory Smoke Detection
YK981 - YK987
The lavatory smoke detection system monitors for the presence of smoke. When
smoke is detected:
• an aural warning sounds
• the red alarm indicator light on the lavatory smoke detector panel
illuminates.
DUAL LOOP AREA
SMOKE DETECTORS
FWD CARGO COMPARTMENT AFT CARGO COMPARTMENT
DISCHARGE TUBING/NOZZLES
FIRE
BOTTLES
March 31, 2016
To Next Page
Loading...
