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fire extinguishing agent or decomposition
products should be avoided.
The gas should not be allowed to contact
the skin; it could cause frostbite
or low temperature burns. If agent
comes in contact with skin, seek medical
help immediately.
2.15 PORTABLE FIRE EXTlNGUISHER.
A pressurized fire extinguisher is mounted on a quick
release support located in the FAB fairing aft of the
right FAB door and above the main landing gear wheel
(fig 2-2). It is accessible through a hinged access panel
and the panel is marked FIRE EXTINGUISHER INSIDE.
The fire extinguisher compound is released by a
hand-operated lever on top of the extinguisher. Inadvertent
discharge of the bottle is prevented by a breakaway
safety wire across the actuating lever. Operating
instructions are printed on the extinguisher.
2.16 ENGINE AND AUXILIARY POWER UNIT (APU)
FIRE DETECTION.
Two optical sensors, which react to visible flames, are
located in each engine compartment and in the APU
compartment. Three pneumatic fire/overheat detectors
are located in the aft deck area. One detector is
mounted on the main transmission support, and one on
each of the two firewall louver doors. Amplified electrical
signals from the sensors located in the engine
compartment will illuminate the respective ENG
FIRE PULL handle (fig 2-15) in both crew stations.
The APU compartment sensors, or the aft deck fire/
overheat detectors, will illuminate the FIRE APU
PULL handle (fig 2-15) in the pilot station and the
FIRE APU segment on the MASTER CAUTION panel
in both crew stations. The engine fire pull handles
(ENG FIRE 1 PULL and ENG FIRE 2 PULL) are
located in similar positions in both crew stations; they
are at the upper left corner of the instrument panel.
The FIRE APU PULL handle is located on the APU
panel on the pilot right console.
2.16.1 Engine and APU Fire Detector Testing. FIRE
PULL handle lamps are tested by pressing the PRESS
TO TEST pushbutton on the MASTER CAUTION
panel in either crew station. The fire detector circuits
receive 28 vdc from the emergency dc bus through the
FIRE DETR circuit breakers (ENG 1, ENG 2 and
APU) on the pilot overhead circuit breaker panel (fig
2-39). The fire detector circuits are tested by turning
the FIRE TEST DET rotary switch located on the pilots
aft right console (fig 2-15). The switch is springloaded
to OFF. When set at 1, the first sensor circuit for
No. 1 engine, No. 2 engine, APU, and left and right firewall
louver door fire detectors are tested, which causes
all FIRE PULL handles to illuminate. The FIRE APU
segments on both MASTER CAUTION panels also illuminate.
When the FIRE TEST DET switch is set at
2, the second sensor circuit for No. 1 engine, No. 2 engine,
APU, and main transmission support fire detector
are tested; and all FIRE PULL handles and both
FIRE APU MASTER CAUTION panel segments will
illuminate. In either test, failure of a handle to light up
indicates a fault in that particular sensor circuit.
2.17 ENGINE AND APU FIRE EXTINGUISHING
SYSTEM
The fire extinguishing agent is stored in two spherical
bottles, each containing a nitrogen precharge. The
bottles, designated as primary (PRI) and reserve
(RES) are mounted on the fuselage side of the No. 1 engine
firewall. Tubing is installed to distribute the extinguishing
agent to either of the engine nacelles or to the
APU compartment. Bottle integrity maybe checked by
inspecting the thermal relief discharge indicator which
is viewed from below the left engine nacelle. A pressure
gage on each bottle provides an indication of the nitrogen
precharge pressure. Each bottle has three discharge
valves that can be individually actuated by an
electrically ignited pyrotechnic squib. There is one
valve for each of the engine nacelles and one for the
APU compartment. When a FIRE PULL handle is
pulled, four events occur: fuel is shut off to the affected
engine, engine cooling louvers to the affected engine
close (not applicable to the APU), the appropriate squib
firing circuit is armed, and the ENCU is shut off (not
applicable to the APU). The extinguishing agent is not
released to the fire area, however, until the FIRE BTL
switch, located near each fire pull handle, is activated.
The FIRE BTL switch is first set at PRI (primary
bottle) . When the fire is extinguished, the light in the
2-19
TM 1-1520-238-10
Figure 2-15. Fire Detection and Extinguishing Controls
2-20
TM 1-1520-238-10
FIRE PULL handle will go out. If the fire is not extinguished,
setting the switch at RES discharges the second
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