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曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
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Jet pipe and pylons;
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APU; and
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Main landing gear.
Smoke detection is provided in the baggage compartment and the lavatory. Provisions are also made for an optional galley overheat detection system.
The fire extinguishing system delivers an extinguishing agent to protected areas of the aircraft; zone A of the engines, and the APU enclosure.
The detection and extinguishing systems can be tested and monitored from the cockpit.
Portable fire extinguishers are provided in the cockpit and cabin.
ENGINE FIRE/OVERHEAT PROTECTION
Description
The engine fire and overheat protection system detects fire and/or overheat conditions in the nacelle, jet pipe, and pylon areas of the engine. The engine fire and overheat protection system is divided into two zones, zone A and zone B:
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Zone A includes the combustion area of the engine. Overheat/fire detection and extinguishing is provided.
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Zone B consists of the jet pipe and pylon area. Only overheat/fire detection is provided for this zone.
Each zone produces a distinctive aural and visual warning when an overheat and/or fire condition is detected.
The extinguishing system consists of two fire extinguisher bottles. Either one or both bottles can be discharged into the zone A area of the engines.
Components and Operation
Heat-Sensing Elements
Each zone of the engine is protected by a single continuous heat-sensing element (loop), connected to its respective fire detection control unit. Each sensing element is a coaxial cable, which has an inner conductor surrounded by an insulator material. The resistance of the insulating material decreases with an increase in temperature. The outer metal sheathing is permanently grounded. The loop resistance information is fed to the corresponding fire detection control unit.
The zone A sensing element is used to detect an overheat/fire condition in the combustion area of the engine.
FIRE PROTECTION Description Vol. 2 09.10.2
Oct 05/06
ENGINE FIRE/OVERHEAT PROTECTION (CONT'D)
The zone B sensing element is used to detect an overheat/fire condition in the area where electrical harnesses and plumbing go through the engine pylon. In addition, this sensing element is used to detect an overheat condition in the exhaust nozzle area of the engine.
Engine Fire Detection
Figure 09.10.1
Jet Pipe/Pylon Overheat Sensing Element
Figure 09.10.2
FIRE PROTECTION Description Vol. 2 09.10.3
Oct 05/06
ENGINE FIRE/OVERHEAT PROTECTION (CONT'D)
Fire Detection Control Units
Each heat-sensing element has its own fire detection control unit, which monitors the resistance of its loop. When the electrical resistance decreases to the warning trip point, the fire detection control unit prompts EICAS messages, as well as aural and visual warnings, to alert the flight crew of a fire and/or overheat condition.
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