HEADQUARTERS OH-58A, Technical Manual

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TM 55-1520-228-10
SECTION XII. LIGHTING
2-51. POSITION LIGHTS.
The position lights consist of three lights (figure 2-1 and
figure 2-2). A green light is located on the right horizon-
tal stabilizer tip, a red light on the left horizontal stabilizer
tip, and a white light on the aft end of the tailboom. Elec-
trical power is supplied from the 28-volt DC non-essen-
tial bus. Circuit protection is provided by the POS LTS
circuit breaker on the overhead console. The position
lights are controlled by the POS LTS switch on the over-
head console (figure 2-12). The switch is a three-posi-
tion toggle switch with BRT (forward) DIM (center) and
OFF (aft) positions.
2-52. NVG POSITION LIGHTS.
Five, white IR position lights (NVG position lights) are
mounted on the aircraft.
Two forward NVG position
lights (figure 2-2) are mounted forward of the FM hom-
ing antenna on both sides of the aircraft. Two lower
NVG position lights (figure 2-2) are mounted forward
of the APR-39 antenna support. One aft NVG position
light is located on top of the tail light support assembly.
Power for NVG position lights is provided by the NVG
POS LTS circuit breaker (figure 2-12).
Operation of
the NVG position lights is controlled by a five-position
rotary switch, NVG POS LTS, (figure 2-12) located on
the overhead console. In position 1, the lights are at
minumum intensity, in position BRT, the lights are at
maximum intensity.
2-53. ANTI-COLLISION LIGHTS.
The anti-collision lights are located one on top of the en-
gine cowling and one centered at the lower section of
the fuselage aft of the avionics compartment. Electri-
cal power for the anti-collision lights is provided by the
28-volt DC electrical system essential bus. The anti-
collision light switch is located on the overhead con-
sole (figure 2-12). The switch is a two-position toggle
type labeled ANTI-COLLISION LTS and OFF. The for-
ward position energizes the anti-collision light circuit.
Float equipped helicopters have lower light relocated
from boom station 88.0 to boom station 103.0.
2-54. LANDING LIGHTS.
IR/White (Dual) Landing/Searchlight. A dual light as-
sembly with a white light on one side and IR light on the
other side is mounted in the lower nose section of the
helicopter (figure 2-2).
Do not illuminate IR light with light assembly
fully retracted.
Doing so may cause light to
overheat, resulting in damage to electrical com-
ponents of the helicopter.
Power for the light assembly is provided by the SRCH
LT CONT and SRCH LT PWR circuit breakers. One
three-position switch and one four-position switch, co-lo-
cated on the pilot collective lever (figure 2-4), are used
to operate the light assembly.
DELETED
The three-position switch LDG LT (ON-NVG-OFF) con-
trols illumination of the white light (ON position) and the
IR light (NVG position).
NOTE
White light will automatically extinguish when
light rotates 90° right or left of center, if extended
less than 60°.
The four-position switch LDG LT (EXT-RETR-L-R) pro-
vides extension, 360° rotation and retraction.
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