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stabilizer. Power for operation of the lights is 28 vdc
and is provided by the NAV circuit breaker on the pilot
overhead circuit breaker panel. Operation of the lights
is controlled by the NAV switch on the pilot EXT LT
panel.
c. Anticollision Lights. High-intensity flashing
red and white anticollision lights are located on each
wingtip. Power for their operation is 115 vac through
the ANTI COL circuit breaker and 28 vdc through the
LT NAV circuit breaker on the pilot overhead circuit
breaker panel. Operation of the lights is controlled by
the ANTI-COL switch on the pilot EXT LT panel.
The searchlight can reach temperatures
capable of igniting fires if contact is made
with combustible/flammable materials.
Do not land in areas such as high grassy
meadows with the searchlight ON.
NOTE
Searchlight motion is inhibited for 60 seconds
after the SRCH LT switch is placed
in the STOW position.
d. Searchlight. The searchlight (fig 2-2) is located
in a fairing under the forward end of the forward avionics
bay just forward of the landing gear attachment and
can be used as a landing light. Power for the searchlight
is 28 vdc routed through a relay by the SRCH
LDG CONTR and SRCH LDG circuit breakers on the
pilot overhead circuit breaker panel. Operation of the
light is controlled by the SRCH LT and EXT-RET
switches on the pilot and CPG collective stick switchboxes
(fig 2-26).
2-74 Change 4
TM 1-1520-238-10
e. Inspection and Maintenance Light. The inspection
and maintenance light is stored in the left
equipment stowage compartment (fig 2-2). Two plug-in
receptacle locations provide electrical power and will
facilitate inspection and maintenance at all points on
the helicopter. The receptacle is located adjacent to the
CPG station on the underside of the right FAB, forward
of the searchlight (fig 2-2). The second receptacle is located
in the right aft avionics bay (fig 2-2). Power for
operating the light is 24 vdc directly from the battery
through the MAINT LT circuit breaker in the right aft
avionics bay. Operation of the inspection and maintenance
light is controlled by an OFF-BRT rheostat
switch which is integral with the light.
2.49.2 Interior Lighting System. The helicopter interior
lighting system consists of dimming lighting for engine
instruments, flight instruments, avionics panels,
console panels, and circuit breaker panels. All engine
and flight instruments are equipped with red surface
mounted edge lighting fixtures, and the avionics console
and circuit breaker panel lights are integrally illuminated.
Light is reflected to illuminate the panel
markings and the clear edging around each switch or
circuit breaker. In the event of total electrical power
generation failure, the pilot and CPG flood lights, utility
lights, and searchlight remain operable through the
dc emergency bus.
a. Pilot Interior Lighting. Interior lighting for the
pilot is controlled by three switch/rheostats and a
three-position FLOOD toggle switch located on the pilot
INTR LT control panel. The three switch/rheostats
provide a detented OFF position and dim to BRT position.
AC voltage is the primary power for the interior
lights. The ac voltage is applied to a multichannel dimmer
assembly through the PRI circuit breaker on the
pilot overhead circuit breaker panel. The multichannel
dimmer converts 115 vac to the proper dc levels for the
three switch/rheostats. The INST, L CSL, and R/CTR
CSL switch/rheostats vary the multichannel dimmer
output. The INST switch/rheostat controls channels 1
and 2 of the multichannel dimmer. Channel 1 is for the
right instrument panel, and channel 2 is for the left
instrument panel. Both channels vary the multichannel
output from OFF position to BRT. The R/CTR CSL
control is split into two sections; A: OFF position, and
BRT for APU FIRE TEST and APX100 control panel.
B: OFF position, and BRT for the avionics control box
lights in the center and right console. The L CSL controls
the circuit breaker panels and the collective stick
grip lights. The pilot also has an EDGE LT PNL ON/
OFF switch located on the overhead circuit breaker
panel that allows him to turn off circuit breaker edge
lights independent of other console lights.
b. CPG Interior Lighting. The CPG interior lighting
operation of the INTR LT switch/rheostats and the
multichannel dimmer are the same as for the pilot operation.
The INST switch/rheostat controls outputs to
channel 1 (right side instruments), channel 2 (left side
instruments), and the ORT. The R CSL controls outputs
　
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