HEADQUARTERS OH-58A, Техническое руководство

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TM 55-1520-228-10
2-55. DELETED.
2-56. INSTRUMENT LIGHTS.
The instrument lights are all on one circuit and are con-
trolled by a rheostat switch labeled INST LTS on the
overhead console (figure 2-12). Clockwise rotation of
the rheostat knob activates the instrument panel circuit
and increases brilliance. Counterclockwise rotation of
the knob dims, with final movement (OFF) deactivating
the electrical circuit from the essential bus.
NVG compatible bezel lights and postlights provide
instrument panel lighting (figure 2-4). The instrument
panel lighting is controlled by the INST LT rheostat
control (figure 2-12) and is powered by the INST LTS
circuit breaker.
2-57. CONSOLE LIGHTS.
The console lights are all on one circuit, and are con-
trolled by a rheostat switch labeled CONSOLE LTS on
the overhead console (figure 2-12). Clockwise rotation
of the rheostat knob activates the console panel circuit
and increases brilliance. Counterclockwise rotation of
the knob dims, with final movement (OFF) deactivating
the circuit, located on the essential bus.
a. Night Vision Features (for Flights Using Night
Vision Goggles (NVG)). A hinged light filter is at-
tached to the instrument panel so it can be adjusted
over the ROTOR RPM warning light of the warning panel
(figure 2-13, items 8 and 9) for flights using NVG, and
adjusted away from the ROTOR RPM warning light for
flights not using NVG. A hinged light filter is also at-
tached to the instrument panel for the other warning
lights, and master caution lights for use in the same
manner.
b. NVG-compatible panel lights provide lighting
of the ICS boxes KY28 and the ADF REVR located in
the aircraft. The console lighting is controlled by the
CONSOLE LT rheostat (figure 2-12) and is powered by
the CSL LT circuit breaker.
2-58. SIGNAL LIGHT RECEPTACLE.
A plug-in type receptacle (figure 2-12) for a hand held
signal light, is located at the aft end of the overhead
console. Power is supplied from the essential bus.
2-59. COCKPIT UTILITY LIGHT.
a. Cockpit Utility Lights. Two cockpit utility
lights are located within easy reach of either crew mem-
ber. One is located on the center post and the other
on the overhead center beam behind the copilot. One
has a light filter for use with flights using NVG when
necessary. The lights may be hand held or positioned in
their holder for direct beam direction. A rheostat switch
is part of each light assembly. Power is supplied from
the non-essential bus through the COCKPIT LTS circuit
breaker.
b. Supplementary NVG-compatible cockpit light-
ing is provided by a utility light and three floodlights. The
2-44 Change 12