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ENG FIRE and APU FIRE Lights
These lights are located in the center of the
glareshield. The engine lights are guarded
switchlights labeled "LH" or "RH ENG FIRE
PUSH." The APU light is not guarded and is
labeled "APU FIRE PUSH." The large red
switchlights give the flight crew a visual in-
dication of an engine fire. The switchlights are
also used to arm the associated fire-extin-
guishing system.
The FIRE PUSH lights indicate that the tem-
perature in at least one of the associated loops
is above the trip level. The light will not ex-
tinguish until the temperature at the detec-
tion loop drops below the trip level. FIRE
lights cannot be canceled.
Fire Bell
The fire bell aural warning always accompa-
nies an illuminated FIRE PUSH light. It can
be muted by pressing the TONE MUTED but-
ton on the aural warning test panel. (The aural
warning system is described in Chapter 4,
"Master Warning System.")
FIRE WARN FAIL Lights
The amber FIRE WARN FAIL lights indicate
the presence of a fire-sensing loop fault (short)
in the associated engine or APU-sensing ele-
ments. This would be accompanied by an
appropriate master caution system reaction.
OPERATION
When a fire or overheat condition occurs in one
of the fire zones, the fire detection unit (Figure
8-3) will cause the associated fire light to il-
luminate. In association with this fire light, the
system also activates the fire warning bell. If
a valid APU fire warning is received, the APU
fire detection control unit will energize the
APU fire shutoff relay, initiating shutdown of
the APU. The fire light and the fire bell (if not
tone muted) continue to operate as long as a
fire/overheat condition exists.
8-4 CL 601-3A/R
CL-600-2B16 PILOT TRAINING MANUAL
If a fire and overheat detection control unit
detects a false warning signal caused by a short
in a sensing cable, it powers the appropriate
FIRE WARN FAIL light on the fire warning test
panel and automatically isolates the defective
fire circuit. The master caution lights flash
when a FIRE WARN FAIL light illuminates.
SYSTEM TEST
There is a three-position, spring-loaded to
OFF toggle switch on the fire-warning test
panel labeled "WARN TEST" and "FAULT
TEST." This switch is used to check the ser-
viceability of the fire detection warning and
fault circuits. Holding the test switch at the
WARN TEST position grounds all the fire-
sensing cables through an appropriate resis-
tor to simulate an actual fire condition in both
powerplants and in the APU. If the fire de-
tection system is functioning correctly, the
fire-warning bell sounds and all six FIRE and
BOTTLE ARMED lights will illuminate.
Holding the test switch at FAULT TEST checks
the operation of the fault detection units by
simulating a short in each of the sensing-cable
circuits. The three FIRE WARN FAIL lights
illuminate to indicate correct operation on the
fault detection circuits. There is also an ap-
propriate master caution system reaction.
When released, the test switch returns to the
center (OFF) position.
FIRE EXTINGUISHING
GENERAL
The extinguishing system consists of engine
fire extinguishing, APU fire extinguishing,
and the portable fire extinguisher.
ENGINE FIRE EXTINGUISHING
The engine fire-extinguishing system con-
tains two Firex bottles. Each system has its own
ENG FIRE, BOTTLE ARMED, LOW PRESS,
and SQUIB lights.
FOR TRAINING PURPOSES ONLY
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