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power may be applied to the inverter by placing the battery compartment. Distribution of DC power is also
ESNTL BUS switch to RUN. controlled by the ESNTL BUS switch.
(2) AC Power Control. AC power is controlled
by the AC GEN switch, ESNTL BUS switch, and INV
and RECT circuit breakers. These controls are located
in the overhead console. In addition, 26 Vac power is
controlled by a 26 Vac PWR circuit breaker located in
the center post console.
(3) Caution Messages. In the event of an
electrical system failure (or failures), an appropriate
message will be displayed on the MFD. The messages
which can be displayed are: DC GEN FAIL, AC GEN
FAIL, RECT FAIL, INV FAIL, HOT BATT 1, HOT BATT
2, and/or (CDS2/CDS3) HOT BATT 1 & 2 or(CDS4)
HOT BATT 1, 2.
(4) Advisory Messages. Advisory messages
will be displayed on the MFD to report the status of
monitored systems. The advisories which may be
displayed are: EXT PWR, to indicate that an external
power source is connected; BATT PREHEAT ON, to
indicate that the BATT 1 and/or BATT 2 switch(es)
Figure 2-22. MPD Electrical System Indicators have been placed in the PREHEAT position.
2-49
TM 1-1520-248-10
SECTION XII. AUXILIARY POWER UNIT
(NOT APPLICABLE)
SECTION XIII. LIGHTING
2-73. POSITION LIGHTS. turns the lights on and the aft or LIGHT OFF position
turns the lights off.
a. Description. The position lights consist of the
three lights (49, 52, and 57, fig. 2-1). A green light is
located on the right horizontal stabilizer tip, a red light 2-76. FLOODLIGHTS.
is located on the left horizontal stabilizer tip, and a
white light on the aft end of the tailboom. a. Description. The floodlights consist of two lights
(8, fig. 2-5), located on either side of the overhead
b. Operation. Power is supplied to the position console. These lights are used to light the cockpit area
lights through the battery emergency bus. The circuit is with either white (CPG side) or green (pilot side).
protected by the POS LT circuit breaker located on the
overhead console (fig. 2-8). The position lights are b. Operation. Power is supplied through the
controlled by the POS LT switch also located on the battery emergency bus and the circuit is protected by
overhead console. This three-position switch permits the CKPT LT circuit breaker (fig. 2-8).
selection of bright (BRT) in the forward position, DIM in
the center position, and LIGHT OFF in the aft position. c. Controls. The floodlights have two controls: a
dimming rheostat labeled FLOOD LT (fig. 2-8) and a
three-position toggle switch. Placing the switch at the
2-74. NVG FORMATION LIGHTS. forward, or WHT position, turns on the white light. The
Six white infrared (IR) NVG-compatible formation lights centered, or GRN position, turns on the NVG light and
are mounted on the aircraft. Two forward lights are the aft, or LIGHT OFF position, turns both lights off.
mounted on the left and right top of the nose section.
One is mounted in the lower forward area of the aft 2-77. SEARCHLIGHT. electronics bay door. One is mounted aft of the lower
anticollision light and just above the tiedown mount.
One is mounted on top of the tail cone structural a. Description. The searchlight (70, fig. 2-1) is a
support, and one is mounted on the right side of the controllable light, located in the underside of the nose
fuselage in the avionics bay area. The POS LT circuit section.
breaker (fig. 2-8), located on the aft overhead console
panel, protects the circuit for the NVG formation lights. b. Operation. The light is controlled by two
Operation of the NVG formation lights is controlled by switches labeled SRCH LT on the pilot collective
the FORMATION LIGHTS rotary switch (fig. 2-8), control head (3, 4, fig. 2-18). The searchlight can be
located next to the overhead console panels. When the turned on by the three-position toggle switch labeled
knob is rotated just out of the OFF position, the lights ON, NVG, OFF. Placing the switch in the ON position
are at minimum intensity, when the knob is rotated to turns on the white searchlight. The center, or NVG
the BRT position the lights are at maximum intensity. position, turns on an NVG-compatible light, and the
OFF position turns off both lights. The searchlight
control switch, labeled EXT, RET, L, R, is center
2-75. ANTICOLLISION LIGHTS. spring-loaded off. The switch controls searchlight
direction. The light receives power through the battery
a. Description. The anticollision lights consist of emergency bus and is protected by the SRCH LT
two lights (28 and 61, fig. 2-1), one centered on top of CONTR and SRCH LT PWR circuit breakers.
the engine cowling, and one centered on the aft
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(27)
