FIRE PROTECTION - DESCRIPTION AND OPERATION
1. General
A. Fire protection consists of a detection system and an extinguishing system. The detection system provides the means to detect a fire and/or overheat condition and alert the crew by aural and visual indications. The extinguisher system provides the means to extinguish a fire.
B. The detection systems give warning of fire and/or overheat in the following areas: each engine, auxiliary power unit (APU), main wheel well, wings and lower aft body. A smoke detection system is also installed on Passenger/Cargo Convertible Airplanes. The smoke detection system monitors the electronic equipment compartment, and the main cabin for the presence of smoke. Fire and smoke warning is indicated by warning lights on the fire protection system module, master warning lights on the lightshield module and an alarm bell in the control cabin. The APU also has a fire warning light located on the APU remote control panel and a warning horn adjacent to the panel in the right main wheel well. Overheat warning is indicated by lights on the air conditioning module and master caution lights on the lightshield module.
(1) On 737-200 series passenger airplanes incorporating Service Bulletin 26A1081, there are smoke detectors and Cargo Electronic Units (CEU) installed in the forward and aft lower cargo compartments (Fig. 1).
C. The extinguishing systems include a fixed engine fire-extinguishing system, a fixed APU fire-extinguishing system, a fixed lavatory fire-extinguishing system, and portable fire extinguishers. The fixed engine fire-extinguishing system consists of two fire extinguisher bottles, providing a two-shot extinguishing capability at either engine. The bottles are connected to each engine by manifolds and tubing. A fire switch for either engine provides the means of selecting either extinguisher bottle for discharge. The fixed APU fire-extinguishing system consists of a single extinguisher bottle connected by tubing to the APU shroud. The engine and APU discharge switches are located on the fire protection module. The APU bottle may be discharged by actuating a discharge switch on the remote APU fire control panel (Fig. 1). The fixed lavatory fire-extinguishing system consists of a heat activated fire extinguisher bottle located in each lavatory. The bottle is provided to extinguish fires under the sink counter and in the towel chute.
(1) On 737-200 series passenger airplanes incorporating Service Bulletin 26A1081, there is a fire-extinguishing bottle located in the mix manifold bay. Fire-extinguishing tubing and discharge nozzles are installed in the forward and aft lower cargo compartments that direct the extinguishing agent into the cargo compartments (Fig. 1).
D. Portable fire extinguishers are located at various positions in the crew and passenger cabins. They provide fire-extinguishing capability in these cabins and other areas accessible from them.
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2. Fire Protection System Module
A. The fire protection system module (P8-1) contains the components necessary to monitor the fire detection system; smoke detection system and wheel well overheat detection system. The fire protection module also has facilities to control and test the fire extinguishing system and smoke detection system. The fire protection system module is located on the aft control stand electronic panel (P8). The front of the module contains the following components for fire and overheat detection: red fire warning lights for each engine and the APU, amber engine overheat lights for each engine, a red wheel well overheat light, an overheat detector switch for each engine, an APU detector inoperative light, a bell cutout switch and a fire test switch. On Passenger/Cargo Convertible Airplanes, the fire protection module also has two red cargo smoke lights. The front of the module also contains the following components for fire extinguishing control: a fire switch for each engine, left, right and APU amber bottle discharge lights, a fire extinguisher test switch, and three green fire extinguisher test circuit lights. Master caution light control circuits and fire extinguisher bottle test circuits are on cards within the module. For detailed coverage of components, refer to applicable system coverage.
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