FIRE PROTECTION

航空发表于 2011-6-13 14:33:00

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航空发表于 2011-6-13 14:34:46

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 fireextinguishing 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.
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. (1) On 737-200 series passenger airplanes incorporating Service Bulletin 26A1081, there is also a cargo fire control panel located on the aft control stand electronic panel (P8), that indicates fire in the cargo areas, and from which fire extinguishing agent can be dispensed to the forward or aft lower cargo area (Fig. 1). 3. Lightshield Module A. The lightshield module (P7) contains master fire warning and master caution lights and the annunciator lights necessary to warn the captain and first officer of a fire or overheat condition. For further information on the module, refer to system coverage and Chapter 33, Master Caution and Warning Lights. 4. Remote APU Fire Control Panel A. The remote APU fire control panel (P28) contains the components necessary to visually check for a fire warning in the APU, to control the remote horn and alarm bell and to control the APU fire extinguishing system from the ground. The fire panel is located on the aft bulkhead of the right main wheel well. For detailed coverage of components, refer to applicable system coverage.
DETECTION - DESCRIPTION AND OPERATION 1. General A. Detection is separated into two categories; fire and overheat. The detection systems include the following subsystems; engine fire detection system, auxiliary power unit (APU) fire detection system, wheel wel1 overheat detection system, and wing and lower aft body overheat detection system. The fire detection systems are basically dual loop detectors (engines) and single loop detector (APU) circuits with the sensing elements spirally wrapped about a rigid support tube and connected to the engine and APU fire detection accessory unit. The overheat detection systems are single loop detector circuits connected to the compartment overheat detection accessory unit. 2. Engine and APU Fire Detection Accessory Unit (Control Module) A. The engine and APU fire detection accessory unit contains all components necessary for fire detection, except the sensing elements, system control switches and indicators. The accessory unit is located on electronic equipment rack E3 in the electronic compartment. The accessory unit contains a detector control card for each sensing loop in the engine and APU areas, relays for fire warning and short circuit discrimination tests, aural warning and master warning light control circuits, a detector test switch and four amber detector inoperative lights (Fig. 1). 3. Compartment Overheat Detection Accessory Unit (Control Module) A. The compartment overheat detection accessory unit contains all components necessary for overheat detection, except the sensing elements, system control switches and indicators. The accessory unit is located on electronic equipment rack E3 in the electronic compartment. The accessory unit contains three overheat control units; an alarm cutout control card; a wheel well overheat test relay; an overheat test relay; test switches and a test light. The overheat control units are connected to sensing loops in the wheel well area, the right overheat section and the left overheat section (Fig. 1). 4. Bleed Air Duct Overheat Test and Indication Section A. The bleed air duct overheat test and indication section is part of the air conditioning module P5-10 on overhead panel P5 and contains the left and right overheat detection system lights to provide a visual means of monitoring overheat conditions along the air conditioning bleed air ducts. A test switch provides the means to test the overheat detection system (Fig. 1). For further information on the module, refer to system coverage and Chapter 21, Air Conditioning.
ENGINE AND APU FIRE DETECTION ACCESSORY UNIT - REMOVAL/INSTALLATION 1. General A. The following procedure assures proper mating of electrical connectors while removing and installing the fire detection accessory unit (M279). CAUTION: IMPROPER ADJUSTMENT OF ASSEMBLIES ON EQUIPMENT SHELVES MAY CAUSE CIRCUIT MALFUNCTION OR EQUIPMENT DAMAGE. B. Lever latches are used for movement and retention of accessory units mounted on racks. This unit consists mainly of a handle and trigger (Fig. 401). Accessory units are held in position by engagement of a hook on the lever-latch handle with a fork-type catch on the rack. Correct adjustment of the lever-latch fork is necessary to assure proper connector engagement. 2. Remove Engine and APU Fire Detection Accessory Unit (Fig. 401) CAUTION: SOME E/E BOXES ARE STATIC SENSITIVE. DO NOT HANDLE BEFORE READING PROCEDURE FOR HANDLING ELECTROSTATIC DISCHARGE SENSITIVE DEVICES (REF 20-40-12). BOXES CONTAIN DEVICES THAT CAN BE DAMAGED BY STATIC DISCHARGE. A. Open these circuit breakers on the P6 panel: (1) FIRE PROTECTION DETECTION - ENG NO. 1 (2) FIRE PROTECTION DETECTION - ENG NO. 2 (3) FIRE PROTECTION DETECTION - APU B. Press on the latch to let the levers move away from handle. C. Move the levers down to force the unit away from the shelf-mounted connector. D. Remove the unit from the shelf. NOTE: To prevent foreign object contamination or damage, cover all ports, openings and electrical connectors of unit or shelf with plastic caps or bags.
3. Install Engine and APU Fire Detection Accessory Unit (Fig. 401) CAUTION: ELECTRICAL PINS ON E/E BOX CONNECTOR AND TRAY CONNECTOR MUST NOT BE BENT OR DAMAGED. INSTALLATION OF E/E BOX WITH DAMAGED PINS COULD RESULT IN DAMAGE TO E/E BOX, TRAY ELECTRICAL CONNECTOR, OR SYSTEM COMPONENTS. A. Slide the unit into shelf with the levers in the open position until the levers engage in the shelfmounted fork. NOTE: Remove any protective caps or bags from unit or shelf prior to installation. B. Move lever-latch to its locked position. (1) The connectors shall mate to the dimensions of detail B (Fig.\401). (2) If necessary, adjust the fork so that with connector properly mated and the lever open 0.50 to 0.60 inch from the locked position, the fork just puts pressure on the lever (Ref 20-10-111). C. Do the engine fire detection system test (Ref Engine Fire Detection System - Adjustment/Test). D. Do the APU fire detection system test (Ref APU Fire Detection System - Adjustment/Test). E. Restore airplane to normal.

bocome 发表于 2011-7-30 19:54:39

FIRE PROTECTION

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FIRE PROTECTION