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The aural warnings can be silenced by pressing either MASTER WARNING switch/light. However, the EICAS warning message will remain displayed, and the APU FIRE PUSH switch/light will remain illuminated, until the fire/overheat condition is corrected. As with the engine fire-sensing elements, the APU fire detection control unit can discriminate between an actual fire/overheat condition and a false fire (i.e., short in the sensing element). In the event of an APU fire detector loop failure, the APU FIRE FAIL caution EICAS message will be displayed. APU Fire Extinguishing Bottle APU fire extinguishing is provided by one Firex bottle, located adjacent to the APU compartment in the aft equipment bay. The bottle is charged with Halon 1301, and pressurized with dry nitrogen (600 to 625 psi). The APU Firex bottle is equipped with a pressure gauge and a thermal discharge port, and is connected by a single tube to the APU compartment. The pressurized extinguishing agent is discharged by a squib with dual firing cartridges, for redundancy. The thermal discharge port provides overpressure relief. Operation is identical to the engine Firex bottles. APU FIRE PUSH Switch/Light The APU fire extinguishing system is controlled by the APU FIRE PUSH switch/light. When the APU FIRE PUSH switch/light is pressed, the following occurs: . The bottle squibs are armed, APU BOTTLE ARMED PUSH TO DISCH switch/light illuminates; . . . . .
AUXILIARY POWER UNIT FIRE/OVERHEAT PROTECTION (CONT'D) APU BOTTLE ARMED PUSH TO DISCH Switch/Light Copilot’s Glareshield Panel Miscellaneous Test Panel |
