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extinguisher bottle is discharged without delay into the corresponding engine/AMAD bay.
The chance of a fire relighting is greatly reduced if the fire extinguisher
bottle is discharged in less than about 90 seconds. Fire testing indicates
that early use of the fire bottle is the best opportunity to put out a fire
and, most importantly, keep it out.
2.14.7 FIRE Detection System Test. Each of the three FIRE warning lights contains four individual
light bulbs. Light bulb integrity can be tested during a LT TEST with ac power applied. If a
malfunction exists in a fire detection loop associated with the APU FIRE light, the APU FIRE voice
alert does not annunciate and none of the four individual bulbs in the light illuminate. If a malfunction
exists in a fire detection loop associated with either FIRE light, the corresponding ENGINE FIRE
LEFT/RIGHT voice alert does not annunciate and only the individual bulb (or bulbs) associated with
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the malfunctioning sensor does not come on. Care must be taken to detect bulbs that are not on in the
FIRE lights during the loop test.
A successful test of the FIRE detection system should illuminate all four bulbs in each of the three
FIRE lights and should annunciate the ENGINE FIRE LEFT, ENGINE FIRE RIGHT, and APU
FIRE voice alerts.
2.14.8 BALD - Bleed Air Leak Detection System. The BALD system is designed to protect the
aircraft from damage resulting from a bleed air leak. The system contains a BALD controller and 11
detector sensing elements routed along the bleed air distribution lines (ducts, valves, and heat
exchangers). If a bleed air leak is detected, the system attempts to isolate the affected ducting by
automatically closing the appropriate bleed air shutoff valve(s). A leak detected upstream of the
secondary bleed air shutoff valve (Item 2) closes only the appropriate primary bleed air shutoff valve
(Item 1). A leak detected downstream of the Item 2 valve closes all three valves (secondary and both
primaries).
When a leak is detected, the BALD system sends commands directly to the appropriate bleed air
shutoff valves, to the BLEED warning lights, and to the ACI, triggering the ²BLEED AIR LEFT
(RIGHT)² voice alerts. When the bleed air shutoff valve(s) are commanded closed, the appropriate L
and/or R BLD OFF caution is displayed. The L BLEED and/or R BLEED warning lights extinguish
as soon as bleed air is removed from the leaking duct and may not be on long enough to be recognized
by the aircrew.
Automatic functioning of the BALD system may extinguish the L(R)
BLEED warning lights prior to aircrew recognition and may not trigger
the appropriate voice alerts. In this case, cycling the BLEED AIR knob to
remove the L and/or R BLD OFF cautions reintroduces hot bleed air to
the leaking duct. If the sensing element was damaged by the leak,
automatic shutdown and isolation capability may be lost. Extensive
damage and/or fire may result.
The BALD controller also sends a separate command to the SDC which sets an MSP code for the
appropriate sensing element.
A bleed air leak can be verified by MSP codes 953, 954, 955, 956, 957, 958, 959, 960 or 961 (code
determines leak location). An overpressure condition is indicated by MSP code 833 with no bleed air
leak codes.
2.14.8.1 Bleed Air Leak Detection System Test. The BALD system is tested by the FIRE test switch
in conjunction with the FIRE detection system. Actuation of the FIRE test switch tests the BALD
system sensors and circuitry. The BALD controller turns on the L and R BLEED warning lights,
annunciates the ²BLEED AIR LEFT/RIGHT² voice alerts, and commands the bleed air shutoff valves
closed setting the L and R BLD OFF cautions. The warnings and cautions indicate that the test has
successfully passed.
The L BLEED and R BLEED warning lights go out when the FIRE test switch is released to NORM,
but the L and R BLD OFF cautions remain until the BLEED AIR knob is cycled through OFF to
NORM with ac power applied.
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2.14.8.2 FIRE Test Switch. The FIRE test switch, located on the forward left console, is used to
initiate a test of the FIRE detection and BALD systems. Operation of the FIRE test switch requires
28 vdc essential bus power. The switch is spring-loaded to the NORM position.
TEST A Initiates a test of loop A of the fire detection and BALD systems.
NORM Provides normal fire and bleed air leak detection.
TEST B Initiates a test of loop B of the fire detection and BALD systems.
A successful test of the FIRE detection and BALD systems should illuminate all four bulbs in the
left, right, and APU FIRE lights, both L BLEED and R BLEED warning lights, and should annunciate
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NATOPS Flight Manual 飞行手册 1(85)
