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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.

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.
Copyright . The Boeing Company. See title page for details.
Fire Protection -System Description 737 Flight Crew Operations Manual

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 wheel well APU fire warning horn sounds and the
wheel well APU fire warning light flashes.

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.
Cargo Fire System Tests
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
Copyright . The Boeing Company. See title page for details.
8.20.8   July 28, 2000

Fire Protection -System Description 737 Flight Crew Operations Manual
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 loops (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.
Note:  Individual detector faults can only be detected by a manually initiated test. The MASTER CAUTION light does not illuminate.
Note:  At the end of cargo fire testing, up to a four second delay may occur to allow all applicable indications to extinguish at the same time.
Cargo Fire Extinguisher Test
When the Cargo Fire TEST button is pushed, the green EXT lights illuminate, verifying the fire bottle discharge squib circuit continuity is normal.
Copyright . The Boeing Company. See title page for details.
Fire Protection -System Description 737 Flight Crew Operations Manual

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Copyright . The Boeing Company. See title page for details.
8.20.10  July 28, 2000

737 Flight Crew Operations Manual

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.1
Flight Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.1 Stabilizer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.6 Rudder  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.8 Aileron / Elevator / Flight Spoilers . . . . . . . . . . . . . . . . . . . . . . . 9.10.9 Speed Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.10 Trailing Edge Flaps  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.12 Leading Edge Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10.16 Flight Control Surface Position Indicator  . . . . . . . . . . . . . . . . . 9.10.17
　
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