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For zone A, the fire warning signal causes the following aural and visual warnings to occur:
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L (R) ENG FIRE warning EICAS message is displayed;
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MASTER WARNING switch/lights illuminate flashing;
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Applicable red LH (RH) FIRE PUSH switch/light illuminates; and
.
Fire bell sounds.
For zone B, the fire warning signal causes the following aural and visual warnings to occur:
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L (R) JETPIPE OVHT warning EICAS message is displayed;
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MASTER WARNING switch/lights illuminate flashing; and
.
“JETPIPE OVERHEAT” aural warning sounds.
The aural warnings can be silenced by pressing either MASTER WARNING switch/light. The EICAS warning message will remain displayed, and the ENG FIRE PUSH switch/light will remain illuminated, until the fire/overheat condition is corrected.
The fire detection control units can discriminate between a true fire/overheat and a short in the heat sensing element. In the event of a fire detector loop failure, the applicable L (R) FIRE FAIL or L (R) JETPIPE OVHT FAIL caution EICAS message will be displayed.
Engine Fire Extinguisher Bottles
Two engine Firex bottles are installed in the aft equipment bay, under the APU enclosure. The bottles are charged with Halon 1301, and pressurized with dry nitrogen (600 to 625 psi).
Each bottle is equipped with a left and right squib (electrically actuated discharge cartridge), thermal discharge port, pressure gauge, and a left and right discharge line. The discharge lines are interconnected to allow discharge of both bottles (if needed) into one engine. The selection of the LH or RH ENG FIRE PUSH switch/light will determine which squibs are fired.
The thermal discharge port provides overpressure relief for each Firex bottle. Should the pressure in a Firex bottle exceed 1,400 psi, the thermal discharge port will discharge the extinguishing agent in the immediate vicinity of the bottle.
FIRE PROTECTION Description Vol. 2 09.10.4
Oct 05/06
ENGINE FIRE/OVERHEAT PROTECTION (CONT'D)
Engine and APU Fire Extinguishing System Figure 09.10.3
LH (RH) ENG FIRE PUSH Switch/Lights
The engine fire extinguishing system is controlled by the LH (RH) ENG FIRE PUSH switch/lights.
When the LH (RH) ENG FIRE PUSH switch/light is pressed, the following occurs:
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The Firex bottle squibs are armed, both BOTTLE 1 and 2 ARMED PUSH TO DISCH switch/lights illuminate;
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Engine generator shuts down;
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Fuel shutoff valve (SOV) closes;
.
Hydraulic shutoff valve (SOV) closes;
.
Bleed air shutoff valve (SOV) closes; and
.
Associated engine igniters disabled.
FIRE PROTECTION Description Vol. 2 09.10.5
Oct 05/06
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