TM 11-5855-217-12
OPERATING INSTRUCTIONS
Section I. OPERATOR'S CONTROLS
AND INDICATORS
WARNING
Before operating this equipment, make sure that all requirements of TB SIG 291 are met. In-
jury or DEATH could result from improper or careless operation.
Function
Control
COMPACT BEAM-SPREAD BEAM
COMPACT BEAM (down) position-searchlight produces a
(Beam switch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
narrow light beam.
SPREAD BEAM (up) position (spring-loaded), spreads
beam from 1.0 compact to full spread at 7.0. Approxi-
mately 2 seconds is required for full beam expansion. To
hold beam at any width between two extremes, release beam
switch and allow it to return to center position.
Note. Center position is off position for focus motor. Holds beam
width fixed while beam switch is at SPREAD BEAM.
OFF (down) position-turns off power to set and returns
OFF-INFRARED-VISIBLE (power switch) . . . . . . . . . . . . . . . . . . .
INFRARED (middle) position-places searchlight in infra-
red operating mode.
visible (up) position-places searchlight in visible operat-
ing mode.
OPERATING POSITION-normal position for operating
CIRCUIT TEST switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
searchlight.
Position 2-tests for input voltage level at 22 volts dc
minimum.
Position 3-tests ballast resistor for continuity.
Position 5-tests for application of 22 to 28 volts dc to
blower motor.
Position 6-tests lamphouse connector for continuity.
Position 7-tests input voltage and power relay K1 operation.
LOCAL position-switches control of searchlight to control
LOCAL-REMOTE (control switch) . . . . . . . . . . . . . . . . . . . . . . . . . . .
box.
REMOTE position-switches control of searchlight to remote
control box.
3-2. Searchlight Indicators
Function
Indicator
Indicates when searchlight is overheated. Turns on at 200 F
OVER TEMP indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(93c) and turns off at 180 F (82c).
Indicates when searchlight Xenon lamp is on by lighting.
LAMP ON indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control
With CIRCUITS TEST switch in OPERATING POSITION,
CIRCUIT TEST indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
indicates malfunction in CIRCUIT TEST switch by
lighting.
With CIRCUIT TEST switch in positions 2 through 7,
indicates malfunction in circuit under test by not lighting.
Measures total time of searchlight set operation in hours
ELAPSED TIME meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
and tenths of hours.
Change 2