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LOWER CARGO COMPARTMENT SMOKE DETECTION -INTRODUCTION
Purpose
The lower cargo compartment smoke detection system gives warnings in the flight deck if there is smoke in a lower cargo compartment.
The system also monitors and controls a remote smoke detector for the electronic equipment cooling system.
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LOWER CARGO COMPARTMENT SMOKE DETECTION -INTRODUCTION
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LOWER CARGO COMPARTMENT SMOKE DETECTION -GENERAL DESCRIPTION
General
The forward and aft lower cargo compartments each have one smoke detector. The smoke detector monitors the cargo compartment air for smoke. Before the air goes in the smoke detector, in-line water separators remove condensation and heaters increase the air temperature.
The forward cargo smoke detector also controls an electrical/ electronic cooling smoke detector and supplies electrical power to it.
See the electrical and electronic cooling smoke detection section for more information about the electrical/electronic cooling smoke detector (SECTION 26-19).
Interfaces
The lower cargo compartment smoke detection system has these interfaces:
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E/E cooling smoke detector
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Left and right systems card files
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AIMS
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Warning electronics system (WES)
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Overhead panel ARINC 629 system (OPAS)
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Proximity sensor electronics unit (PSEU)
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Equipment cooling system
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Cargo fire/engine control panel.
General Operation
If there is smoke in a cargo compartment, AIMS causes a cargo fire warning message. The WES turns on the fire warning aural and the master warning lights. The OPAS turns on the FWD or AFT cargo fire warning light on the cargo fire/engine control panel.
System Tests
The smoke detectors have built-in-test-equipment (BITE). The BITE does power-up and periodic tests of the system. Faults cause alert messages, status messages, or maintenance messages.
You can also use the fire/overheat test switch to do a test of the system. See the fire protection section for more information about the fire/overheat test (SECTION 26-00).
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LOWER CARGO COMPARTMENT SMOKE DETECTION -GENERAL DESCRIPTION
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LOWER CARGO COMPARTMENT SMOKE DETECTION -FLIGHT DECK COMPONENT LOCATIONS
Component Locations
These are the components in the flight deck that have an interface with the lower cargo compartment smoke detection system:
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Speakers
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Cargo fire/engine control panel
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Master warning lights.
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LOWER CARGO COMPARTMENT SMOKE DETECTION -FLIGHT DECK COMPONENT LOCATIONS
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LOWER CARGO COMPARTMENT SMOKE DETECTION -LOWER CARGO COMPARTMENT COMPONENT LOCATIONS
Lower Cargo Compartments
The forward and aft lower cargo compartments each have one smoke detector. Each smoke detector has two fans. Air sampling ports in the cargo compartment ceiling connect to air inlet tubes. The air inlet tubes are above the ceiling and behind the left side of the cargo compartments. The tubes connect to air inlet ports at the top of the smoke detectors. Exhaust ducts take air from the fans and release it behind the sidewall lining.
A water separator and heater are in line with each air inlet tube. Suction lines go from each water separator to a manifold at an inlet port of the smoke detector. Each heater connects to a controller.
Training Information Point
Open the cargo compartment sidewall lining that is opposite the cargo doors to get access to the smoke detectors.
To get access to the water separators, heaters and controllers, open the sidewall lining adjacent to the smoke detectors or the ceiling lining above the smoke detectors.
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LOWER CARGO COMPARTMENT SMOKE DETECTION -LOWER CARGO COMPARTMENT COMPONENT LOCATIONS 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 防火 Fire Protection(13)
