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pressure gauge on each container is visible from inside the tailcone. Halon
1301 is non-toxic at normal temperatures and is non-corrosive. As
Halon 1301 is non-corrosive, no special cleaning of the engine or nacelle
area is required in the event the system has been used. The system operates
on 28-vdc supplied through the 5-amp L and R FIRE EXT circuit
breakers located within the respective ENGINE group of the pilot’s and
copilot’s circuit breaker panels. Fire extinguishing systems are powered
from the EMER BATT hot bus.
Pilot’s Manual
PM-126A 2-23
L AND R ENGINE FIRE AND EXTINGUISHER #1/#2 SWITCHES
The engine fire extinguishing system is operated through the L and R
FIRE switches and the EXTINGUISHER #1 and #2 switches located in
the respective L and R ENGINE panel on the aft pedestal. Activating
the applicable FIRE switch will cause the following events:
• Close the respective shutoff valves. (Refer to Figure 2-3.)
• CLOSED indication will appear on respective FIRE switch.
Flashing FIRE PUSH illumination goes to steady.
• Arm the extinguishing agent containers.
• EXTINGUISHER #1 and #2 light illuminated.
• Trip respective DC generator and alternator off-line.
• Trip respective engine ignitors off-line.
• Trip respective thrust reverser control unit off-line and prevent
the thrust reverser isolation valve from opening.
Illumination of the EXTINGUISHER #1/#2 ARMED light(s) indicates
that the fire extinguishing system is armed and the squibs are good. Depressing
an illuminated EXTINGUISHER #1 ARMED light will discharge
the contents of the first extinguisher bottle into the associated
nacelle. Depressing the EXTINGUISHER #2 ARMED light will discharge
the contents of the second bottle. Either or both EXTINGUISHER
#1/#2 ARMED lights may be depressed to extinguish the fire.
Should the first container control the fire, the other container is available
to either engine.
FIRE EXTINGUISHER DISCHARGE INDICATORS
Two disk-type indicators are flush-mounted in the fuselage under the
right engine pylon. If the contents of either or both containers have
been discharged into the engine nacelles, the yellow disk will be ruptured.
If the contents of either or both containers have been discharged
overboard as the result of an overheat condition causing excessive pressure
within the containers, the red disk will be ruptured. If both disks
are intact, the system has not been discharged.
Pilot’s Manual
2-24 PM-126A
FIRE EXTINGUISHING SYSTEM
Figure 2-3
ARMED ARMED
CLOSED
FIRE
PUSH
#1 #2
EXTINGUISHER FIRE
L ENGINE
CLOSED
FIRE
PUSH
FIRE
ARMED ARMED
#2 #1
EXTINGUISHER
R ENGINE
L NACELLE
BLEED AIR
SHUTOFF
VALVES
FUEL
SHUTOFF
VALVE
#1
CONTAINER
PRESSURE
GAUGE
RED
SHUTTLE
VALVES
R NACELLE
R DC
GENERATOR
TRIP
R WSHLD
ALTERNATOR
TRIP
R ENGINE
IGNITORS
TRIP
R THRUST REVERSER
CONTROL UNIT
TRIP
YELLOW
#2
CONTAINER
RELIEF VALVE RELIEF VALVE
PRESSURE
GAUGE
THERMAL
DISCHARGE
INDICATOR
MANUAL
DISCHARGE
INDICATOR
HYDRAULIC
SHUTOFF
VALVE
BLEED AIR
SHUTOFF
VALVES
FUEL
SHUTOFF
VALVE
HYDRAULIC
SHUTOFF
VALVE
A26-0001
L DC
GENERATOR
TRIP
L WSHLD
ALTERNATOR
TRIP
L ENGINE
IGNITORS
TRIP
L THRUST REVERSER
CONTROL UNIT
TRIP
Pilot’s Manual
PM-126A 2-25
THRUST REVERSERS
Each engine is equipped with an independent, electrically controlled,
hydraulically actuated, clamshell-type thrust reverser. The thrust reverser
system consists of a thrust reverser control unit, an engine nacelle
afterbody on each engine, a piggy-back thrust reverser lever on
each main thrust lever, associated hydraulic plumbing, and associated
electrical wiring.
The thrust reverser control unit integrates all deploy, stow, and indication
functions of the thrust reverser system. Input signals indicating the
status of each of these functions are analyzed by the thrust reverser
control unit. Different combinations of these signals will generate the
applicable output command from the thrust reverser control unit.
Each nacelle afterbody consists of an upper and lower blocker door, an
inboard and outboard primary deploy/stow actuator, unlatch actuator,
unlatch switch, unlock switch, full deploy switch, and a throttle retard
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