Wheel Well Detection
The overheat detection system for the wheel wells provides detection only. There is no extinguishing equipment installed in the wheel wells. Fire detection elements are installed in the top of each of the three wheel wells. When the detector is activated by an overheat condition, both visual and aural warnings are given. The master FIRE WARN lights on the glareshield and the wheel well fire warning light on the pilot's overhead panel illuminate. and the fire warning bell rings. The bell can be silenced by use of any of the bell cutouts used for engine or APU fire warnings. The wheel well light remains an until the overheat condition no longer exists. The electrical power source for the wheel well fire detection circuit is essential AC.
To test the fire detection system. A fire test switch is located on the pilot's overhead panel. The switch is spring loaded to the center. The sensitivity of the circuits is such that it should take no more than 60 seconds to activate all three of the fire warnings. Holding the switch in the up position tests the detection circuits for the firewalls. Holding the switch in the down position tests the engine sensors and the wheel well detection loops. The wheel well warning is activated immediately upon initiation of the test. There is a delay for the engine and firewall warnings.
Fire extinguishing devices are located in the lavatories. Heat sensitive plugs automatically release the extinguishing agent to flood the water heater or towel dispenser if a fire should occur. A temperature sensitive indicator records temperature in the critical areas. The appropriate circle will blacken to indicate temperature reached. There is no visual or aural warning if this system in the toilet is activated.
Wheel Well Detection
The overheat detection system for the wheel wells provides detection only. There is no extinguishing equipment installed in the wheel wells. Fire detection elements are installed in the top of each of the three wheel wells. When the detector is activated by an overheat condition, both visual and aural warnings are given. The master FIRE WARN lights on the glareshield and the wheel well fire warning light on the pilot's overhead panel illuminate. and the fire warning bell rings. The bell can be silenced by use of any of the bell cutouts used for engine or APU fire warnings. The wheel well light remains an until the overheat condition no longer exists. The electrical power source for the wheel well fire detection circuit is essential AC.
To test the fire detection system. A fire test switch is located on the pilot's overhead panel. The switch is spring loaded to the center. The sensitivity of the circuits is such that it should take no more than 60 seconds to activate all three of the fire warnings. Holding the switch in the up position tests the detection circuits for the firewalls. Holding the switch in the down position tests the engine sensors and the wheel well detection loops. The wheel well warning is activated immediately upon initiation of the test. There is a delay for the engine and firewall warnings.
Fire extinguishing devices are located in the lavatories. Heat sensitive plugs automatically release the extinguishing agent to flood the water heater or towel dispenser if a fire should occur. A temperature sensitive indicator records temperature in the critical areas. The appropriate circle will blacken to indicate temperature reached. There is no visual or aural warning if this system in the toilet is activated.
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