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underside of the fuselage.
2-78. UTILITY LIGHT.
b. Operation. Power is supplied through the
battery emergency bus. The circuit is protected by the a. Description. A utility light is located between
ANTI COLL LT c i r c u i t breaker ( f i g . 2-8). The the crewmember seats. This light is removable from the
anticollision lights are controlled by the ANTI COLL mounting bracket and has an alternate mounting
switch (fig. 2-8). The forward or ANTI COLL position bracket above the CPG seat.
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b. Operation. The light is equipped with an on/off, power converters are used with ANVIS goggles. When
bright-dim rheostat and a momentary on switch. A filter the goggles are plugged into these converters, they
lens provides NVG capability and a focusing ring allows receive power from the helicopter using the selfadjusting
of light beam from small spot to wide beam. contained batteries as a backup.
The l i g h t receives power from the DC battery
emergency bus and is protected by CKPT LT circuit b. Operation. Power to the power converters (fig.
breaker. 2-23) is received through the battery emergency bus
and the circuit is protected by the NVG PWR circuit
breaker located on the overhead console. The NVG
2-79. INSTRUMENT LIGHTS. power supply operational check is as follows:
a. Description. The instrument lights illuminate the (1) Helicopter DC electrical power ON.
system and flight instruments as well as all control (2) Pilot NVG power pack batteries Remove.
panels located on the instrument panel. The lights are
NVG-compatible. (3) Pilot NVG power pack Connect to pilot
helicopter NVG power converter.
b. Operation. They are controlled by the INST LT
rheostat control knob located on the overhead console (4) Pilot NVG power pack switch ON.
(fig. 2-8). Turning the knob full counterclockwise turns (5) Pilot helicopter NVG power converter switch
the lights OFF and turning it clockwise increases light ON. Observe NVG activate.
intensity, with the BRT position being full intensity.
Power to the instrument lights is received through the (6) Pilot helicopter NVG power converter switch
AC essential bus and the circuit is protected by the EL OFF. Observe NVG deactivate.
LT circuit breaker located in the center post circuit (7) Pilot helicopter NVG power converter switch
breaker panel (fig. 2-8). Hold momentarily in TEST, then release. Observe
TEST IND light illuminates and then extinguishes.
2-80. PEDESTAL AND OVERHEAD CONSOLE (8) Pilot NVG power pack switch OFF.
LIGHTS. (9) Pilot NVG power pack batteries Install.
a. Description. The pedestal and overhead (10) Pilot NVG power pack switch ON.
console lights illuminate the overhead consoles, center Observe NVG activate.
post console, and the pedestal console. These panels
(11) Pilot helicopter NVG power converter switch
are NVG-compatible. ON. Observe NVG remain illuminated.
b. Operation. They are controlled by the (12) Pilot helicopter NVG power converter switch
CONSOLE LT rheostat control knob located on the OFF. Observe NVG remain illuminated with NVG
o v e r h e a d c o n s o l e . T u r n i n g t h e k n o b f u l l power pack.
counterclockwise turns the lights OFF and turning it
clockwise increases light intensity, with the BRT (13) Pilot helicopter NVG power converter switch
position being full intensity. Power to the lights is ON.
received through the AC essential bus and the circuit is (14) Repeat steps 2 thru 13 for CPG NVG power
protected by the EL LT circuit breaker located in the supply.
center post circuit breaker panel (fig. 2-8).
2-81. NVG POWER CONVERTER.
a. Description. Two night vision goggles (NVG)
power converters (11, fig. 2-5) are located behind the
pilot and CPG seats on the upper bulkhead. These
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406075-575
J1185
CONTROL/INDICATOR FUNCTION
1. NVG power converter switch TEST position activates circuit test. OFF position turns
power converter off. ON position activates power
converter circuit.
2. TEST IND light Light illuminates when test circuits are activated.
Figure 2-23. NVG Power Converter
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SECTION XIV. FLIGHT INSTRUMENTS
2-82. FLIGHT INSTRUMENTS/DISPLAYS. 150 knots. It is operated by the differential between
impact and static air pressure and requires no electrical
This section contains information on a l l f l i g h t current except for lighting.
instruments and displays to include primary and
secondary flight instruments, other miscellaneous (3) Standby Altimeter. A standby altimeter (9,
instruments pertaining to flight, and the caution, fig. 2-6) is located to the right of the standby attitude
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(28)
