26___021.PDF

At the overheat temperature set point the gas expands

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At the overheat temperature set point, the gas expands in the detector and closes the OVERHEAT pressure switch. This decreases the resistance of the detector. The engine and APU fire detection module uses this decrease in resistance to set the overheat condition. These are the results of an overheat condition: * MASTER CAUTION and OVHT/DET annunciator lights come on * Related engine fire handle switch unlocks * Related ENG OVERHEAT light comes on. At the fire temperature set point, the gas expands more to close the FIRE pressure switch in the detector. This decreases the resistance further. The engine and APU fire detection module uses this signal to set the fire condition. These are the results of a fire condition: * Two red FIRE WARN lights * Aural warning unit bell * Related engine fire warning switch lights * Related overheat indications stay on. The FAULT/INOP test does a check of the module fault detection circuitry and related flight compartment indications. These are the indications of a good FAULT/INOP test: * MASTER CAUTION and OVHT/DET annunicator lights come on * Amber FAULT light comes on * Amber APU DET INOP light comes on * All FAULT AREA display lights on the engine and APU fire detection module come on * All FAULT DISPLAY lights on the engine and APU fire detection module come on after five seconds. NOTE: YOU CAN ALSO DO THE FAULT INOP TEST AT THE ENGINE AND APU FIRE DETECTION MODULE.THE INDICATIONS IN THE FLIGHT COMPARTMENT WILL BE THE SAME. The OVHT/FIRE test does a check of the module overheat and fire detection circuitry and flight compartment indications. These are the indications of a good OVHT/FIRE test: * MASTER CAUTION and OVHT/DET lights come on * Two red FIRE WARN lights come on * ENG 1, ENG 2, and APU fire handle switch lights come on * Amber ENG 1 and ENG 2 OVERHEAT lights come on * Red WHEEL WELL light comes on (115v ac power is necessary) FIRE PROTECTION - ENGINE FIRE DETECTION - FUNCTIONAL DESCRIPTION EFFECTIVITY AMX ALL 26-11-00 Page 11 Jun 10/2003 D633A101-AMX BOEING PROPRIETARY - Copyright # - Unpublished Work - See title page for details. 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL 26-11-00-005
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* Aural warning unit bell sounds * APU ground control panel horn and red light come on * ENG 1, ENG 2, and APU fire handle switches unlock. Training Information Point If the OVHT DET switch is in the NORMAL position, the two loops on one engine must have a fault condition before the FAULT light comes on. NOTE: The MASTER CAUTION indication does not come on with the FAULT light. FIRE PROTECTION - ENGINE FIRE DETECTION - FUNCTIONAL DESCRIPTION EFFECTIVITY AMX ALL 26-11-00 Page 12 Jun 10/2003 D633A101-AMX BOEING PROPRIETARY - Copyright # - Unpublished Work - See title page for details. 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL 26-11-00-005
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FIRE PROTECTION - ENGINE FIRE DETECTION - FUNCTIONAL DESCRIPTION FIRE PROTECTION - ENGINE FIRE DETECTION - FUNCTIONAL DESCRIPTION EFFECTIVITY AMX ALL 26-11-00 Page 13 Jun 10/2003 D633A101-AMX BOEING PROPRIETARY - Copyright # - Unpublished Work - See title page for details.
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  • Fall '19
  • Active fire protection, Fire protection, Smoke detector, Fire alarm control panel, Fire alarm system

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