ENGINE FIRE EXTINGUISHING -ENGINE FIRE SWITCH CIRCUIT -FUNCTIONAL DESCRIPTION
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ENGINE FIRE EXTINGUISHING -FUNCTIONAL DESCRIPTION -ENGINE FIRE EXTINGUISHING CIRCUIT
Bottle Discharge
The engine fire switch supplies power from the hot battery bus to the engine fire extinguishing bottle squibs. The DISCH 1 position fires the squib for bottle 1. The DISCH 2 position fires the squib for bottle 2.
Discharge Indication
When pressure inside the bottle decreases, the pressure switch closes and makes a ground for the discharge indicator light. The ground also causes AIMS to show advisory and status messages.
Training Information Point
You can do a check of the pressure switch circuit on the ground. Push and hold the test button to close the switch. The bottle discharge light in the flight deck should come on. Bottle discharge advisory and status messages should show.
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ENGINE FIRE EXTINGUISHING -FUNCTIONAL DESCRIPTION -ENGINE FIRE EXTINGUISHING CIRCUIT
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ENGINE FIRE EXTINGUISHING -OPERATION
Engine Fire Warning
If an engine has a fire, the engine fire detection system gives a fire warning in the flight deck. The engine fire warning lights come on to identify the fire switch to use to extinguish the fire. The solenoid in the fire switch energizes and releases the switch so you can pull it. If the solenoid does not energize, push the fire override switch to release the fire switch manually.
Fire Switch Out
If the engine is running, it stops when you pull the fire switch. The fire switch isolates the engine from the airplane systems.
Fire Bottle Discharge
If the fire warnings do not go away with the switch pulled, put the switch to DISCH 1 or DISCH 2. Hold the switch against the stop for one second. This fires a bottle squib and release the fire extinguishing agent into the engine nacelle. Make sure the engine bottle discharge light comes on.
If the first bottle does not extinguish the fire, you can put the switch to the other DISCH position. This fires the squib for the other bottle.
Discharge Indications
The engine bottle discharge light comes on when halon is released from the bottle. Advisory and status messages also show.
Training Information Point
Be careful not to discharge the engine fire bottles accidently. The fire switch is normally locked when the engine is running so you cannot pull it accidently. The switch releases if the engine has a fire. The switch also releases for these two conditions:
*
When the battery switch is ON and the engine fuel control switch is in CUTOFF
*
During a fire/overheat test.
The engine fire switches connect to the hot battery bus. If you pull and rotate the switch, the fire bottles will discharge. This happens with the battery switch ON or OFF, and with or without ground power on the airplane.
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777 AIRCRAFT MAINTENANCE MANUAL
ENGINE FIRE EXTINGUISHING -OPERATION
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
APU FIRE EXTINGUISHING -INTRODUCTION
Purpose
The APU fire extinguishing system extinguishes fires in the APU compartment.
General
If a fire occurs on the ground and the engines are not running, the APU fire extinguisher discharges automatically. This permits unattended operation of the APU. You can also operate the system manually from the flight deck or the nose gear service panel.
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APU FIRE EXTINGUISHING -INTRODUCTION
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APU FIRE EXTINGUISHING -GENERAL DESCRIPTION
General
The APU fire extinguishing system has these components:
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