Fire Protection -
Cargo Fire Extinguisher Schematic
FWD Cargo Compartment Fire AFT Cargo Compartment
Bottles

As installed
Lavatory Fire Protection
Lavatory fire protection consists of these systems:
.  
lavatory smoke detection

.  
lavatory fire extinguishing (heat activated).

Lavatory Smoke Detection
The lavatory smoke detection system monitors for the presence of smoke. When smoke is detected:
.  
an aural warning sounds over the passenger address system

.  
the red alarm indicator light on the lavatory smoke detector panel
illuminates

.  
pressing the interrupt switch silences the aural warning. If smoke is still
present when the switch is released, the alarm will sound again

There is no flight deck indication. When smoke is no longer present the system automatically resets.
Lavatory Fire Extinguisher System
A fire extinguisher system is located beneath the sink area in each lavatory. When a fire is detected:
.  
fire extinguisher operation is automatic

.  
flight deck has no indication of extinguisher discharge.

Copyright . The Boeing Company. See title page for details.
8.20.6   June 4, 2004

Fire Protection -System Description 737 Operations Manual
Fire and Overheat System Tests
The fire and overheat detection systems can be tested by pushing and holding the FAULT/INOP and OVHT/FIRE TEST switch. Extinguisher continuity can be tested by pushing and holding the EXT TEST switch. All test indications clear when switches are released.
FAULT/INOP Test Detection
The fault detection circuits for both the engines and the APU are tested by pushing and holding the FAULT/INOP and OVHT/FIRE TEST switch in the FAULT/INOP position.
The indications for the FAULT/INOP test are:
.  
both MASTER CAUTION lights illuminate

.  
the OVHT/DET system annunciator light illuminates

.  
the FAULT light illuminates

.  
the APU DET INOP light illuminates.

OVERHEAT/FIRE Test Detection
The overheat and fire detection loops on both engines, the APU, and the fire detector in the wheel well are tested by pushing and holding the FAULT/INOP and OVHT/FIRE TEST switch in the OVHT/FIRE position.
The indications for the OVHT/FIRE test are:
.  
the fire warning bell sounds

.  
both master FIRE WARN lights illuminate

.  
both MASTER CAUTION lights illuminate

.  
the OVHT/DET system annunciator light illuminates

.  
both engine fire warning switches illuminate

.  
the APU fire warning switch illuminates

.  
both ENG OVERHEAT lights illuminate

.  
the WHEEL WELL fire warning light illuminates if AC power is
available

.  on the ground, the APU fire warning horn sounds and the APU fire
warning light in the main wheel well flashes.

Note:  During an OVERHEAT/FIRE Test with the Kidde fire protection system, the FAULT light will illuminate if one or more detectors in the loop(s) has failed. With the Systron Donner system, a detection loop is inoperative if an Engine Fire Warning switch and an ENG OVERHEAT light do not illuminate.
Fire Protection -System Description 737 Operations Manual

Extinguisher Test
When the EXT TEST switch is positioned to 1 or 2, the green EXT TEST lights illuminate, verifying circuit continuity from the squib to the engine fire warning switch. On some airplanes, the amber BOTTLE DISCHARGE lights also illuminate.
Cargo Fire System Tests (as installed)
The cargo fire detection and suppression system can be tested by pushing and holding the cargo fire TEST switch. This sends a test signal to the forward and aft cargo fire detector loops and verifies continuity of the extinguisher bottle squib circuits. All test indications clear when the TEST switch is released
Cargo Fire TEST
The indications for the Cargo Fire test are:
.  
the fire warning bell sounds

.  
both master FIRE WARN lights illuminate

.  
the extinguisher test lights illuminate

.  
the FWD and AFT cargo fire warning lights illuminate when all detectors
in selected loop(s) respond to the fire test

.  
the cargo fire bottle DISCH light illuminates

Note:  The fire warning BELL CUTOUT switch on the Overheat/Fire Protection
panel can silence the fire warning bell and extinguish the master FIRE
WARN lights
Note:  During a Cargo Fire Test, the DETECTOR Fault light will illuminate if one or more detectors in the loop(s) has failed.
　
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