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E/E COOLING SMOKE DETECTION -FUNCTIONAL DESCRIPTION
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The cargo smoke detector operates the other channel in the E/E cooling smoke detector
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The cargo smoke detector puts the fault data in memory
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The cargo smoke detector sends the fault information to the AIMS. The CMCS shows status and maintenance messages.
You can do a test of the system from the MAT. AIMS tells the cargo smoke detector to do a power-up BIT sequence.
Training Information Point
Use the MAT to get E/E cooling smoke detector fault data from the cargo smoke detector memory.
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E/E COOLING SMOKE DETECTION -FUNCTIONAL DESCRIPTION
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ENGINE FIRE EXTINGUISHING -INTRODUCTION
Purpose
The engine fire extinguishing system extinguishes fires in the engine nacelles.
General Description
The two fire extinguishing bottles contain halon fire extinguishing agent pressurized with nitrogen. You use the engine fire switches in the flight deck to release the halon. Halon from each bottle can go to the right or left engine. EICAS messages, status messages, and indicator lights show when the bottle pressure is low.
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ENGINE FIRE EXTINGUISHING -INTRODUCTION
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ENGINE FIRE EXTINGUISHING -COMPONENT LOCATIONS
Flight Deck Component Locations
The engine fire panel is in the flight deck on the P8 aisle stand.
Forward Cargo Compartment Component locations
The two engine fire extinguishing bottles are behind the right sidewall lining of the forward cargo compartment, aft of the cargo door. Open the cargo compartment lining to get access to the bottles.
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ENGINE FIRE EXTINGUISHING -COMPONENT LOCATIONS
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ENGINE FIRE EXTINGUISHING -ENGINE FIRE EXTINGUISHING BOTTLES
Purpose
The engine fire extinguishing bottles contain the fire extinguishing agent.
Location
The two fire extinguishing bottles are outboard of the right sidewall lining of the forward cargo compartment. The access panel is identified ENGINE FIRE EXTINGUISHER ACCESS PANEL.
Physical Description
The two engine fire extinguishing bottles are identical. Each bottle has these components:
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A safety relief and fill port
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A handle for removal and installation
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A pressure switch
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Two discharge assemblies
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An identification plate
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Four mounting lugs.
The engine fire extinguishing bottles are interchangeable with the APU fire extinguishing bottle.
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Functional Description
The bottles contain halon fire extinguishing agent pressurized with nitrogen. If the pressure in the bottle becomes too high, the safety relief and fill port opens so the bottle does not explode. The discharge assembly has an explosive squib. An electric current from the fire extinguishing circuit fires the squib. This releases the halon through the discharge port.
The pressure switch gives flight deck indications when bottle pressure decreases. The switch monitors the pressure inside the bottle and is normally open. When the pressure decreases because of a leak or because of bottle discharge, the switch closes an indicating circuit.
Training Information Point
A special service platform is available which makes bottle replacement easier.
When you replace bottles, handle them carefully to prevent damage. Compare the weight of the new bottle with the weight on the identification plate. This prevents installation of a bottle which is not full.
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