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Figure 2-1-14. Overhead Switch Panel 714A
TM 1-1520-240-10
2-1-18
Figure 2-1-15. Armored Seats
TM 1-1520-240-10
2-2-1
SECTION II. EMERGENCY EQUIPMENT
2-2-1. Emergency Procedures.
Refer to Chapter 9 for all emergency procedures.
2-2-2. Engine Compartment Fire Extinguisher System.
The engine compartment fire extinguisher system (fig.
2-2-1) enables the pilot or copilot to extinguish a fire in
either engine compartment only. It is not designed to
extinguish internal engine fires. The system consists of
two FIRE PULL handles, an AGENT DISCH (agent discharge)
switch, a FIRE DETR (fire detector) switch on the
center instrument panel, and two extinguisher agent containers
on the overhead structure at stations 482 and
502. The containers are partially filled with monobromotrifluoromethane
(CBrF3 or CF 3BR) and pressurized with
nitrogen (table 2-2-1 provides the range of engine fire
extinguisher pressures.) The agent in one or both of the
containers can be discharged into either engine
compartment. Selection of the compartment is made by
pulling the appropriate FIRE PULL handle. In figure 2-2-1
the ENG 1 FIRE PULL handle has been pulled. Selection
of the container is made by placing the AGENT DISCH
switch in the appropriate position. In figure 2-2-1, BTL 1
has been selected.
2-2-3. FIRE PULL Handles.
WARNING
Before flying the aircraft ensure that each
FIRE PULL handle NVG filter holder can be
rotated from the closed to the open position
without causing the FIRE PULL handle
to be pulled. Improper handling of the
NVG filter holder may cause the FIRE
PULL handle to be pulled unintentionally,
thus fuel to the affected engine will be shut
off and the engine will shut down. Do not
use sudden or excessive force when rotating
the FIRE PULL handle NVG filter holder
from the closed to the open position.
Two control handles for the engine fire extinguisher system
(fig. 2-2-1) are labeled FIRE PULL - FUEL SHUTOFF
on the top center section of the center instrument
panel. Each handle has a cover for the NVG filter, two
warning lights, and the necessary control switches that
close the engine fuel shutoff valve and arm the fire extinguisher
system circuits. Power is supplied for each FIRE
PULL handle from the respective No. 1 and No. 2 DC
essential buses through the respective ENGINE NO. 1
and NO. 2 FUEL SHUTOFF circuit breakers on the No.
1 and No. 2 PDP. Power is supplied for each pair of
warning lights from the corresponding No. 1 or No. 2 AC
bus through the ENGINE NO. 1 and NO. 2 FIRE DET
circuit breakers on the No. 1 and No. 2 PDP.
Table 2-2-1. Engine Compartment Fire Extinguisher Pressures
AMBIENT TEMPERATURE
(C)
MINIMUM INDICATION
(PSI)
-54
271
-51
275
-40
292
-29
320
-18
355
-7
396
4
449
15
518
27
593
38
691
52
785
TM 1-1520-240-10
2-2-2
Fwd
Valve
Fwd
Valve
Figure 2-2-1. Engine Compartment Fire Detection and Extinguishing System (Typical)
TM 1-1520-240-10
2-2-3
WARNING
If the FIRE PULL handle warning lights are
covered by the NVG filters during daylight
operation, illumination of the fire warning
lights may not be apparent in the event of
an engine fire. Do not operate the aircraft
with the NVG filters covering or obscuring
the fire warning lights unless night vision
goggles are being used.
The NVG filter is attached to one end of the FIRE PULL
handle by hinged fitting. The other end of the filter holder
forms a tab by which the filter holder and filter may be
rotated about the hinged fitting. For NVG operations, the
filter holder is rotated to a closed position over the front
of the FIRE PULL handle cover. In this position, the fire
warning light is NVG compatible. For normal operations,
the filter holder is rotated from the closed position to the
fully open position. In this position, the FIRE PULL handle
warning lights will be red.
CAUTION
If there is a fire in both engine compartments,
do not pull both FIRE PULL handles
simultaneously. Extinguish fire in
one compartment only as described below.
Leave the FIRE PULL handle out after
fire has been extinguished. Proceed in a
like manner to extinguish fire in the other
engine compartment.
When an engine compartment fire occurs on either side,
the respective pair of warning lights comes on. The appropriate
FIRE PULL handle is pulled, that engine fuel
shutoff valve closes and the AGENT DISCH switch is
　
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