Section II. OPERATION UNDER
the exhaust blower will operate, the LAMP ON indicator
will light, and the CIRCUIT TEST indicator does not
Do not attempt any cleaning procedures while
the searchlight is operating. The searchlight
c. If the xenon lamp does not ignite, set the
uses high voltages and current for operation
switch to OFF and repeat the starting procedure. Do not
which can cause serious injury.
try to ignite the xenon lamp after five or six attempts
have been made.
The air intake and exhaust ducts on the heat exchanger
d. Check the air intake and exhaust ducts for airflow
must be free from obstructions before the equipment
to make certain that the blower motor is operating.
is operated. If necessary, flush water through air ducts
e. After 1 minute of xenon lamp operation, check to
to remove any dirt, insects, or other foreign matter
see that the OVER TEMP indicator is not lighted. Im-
which may restrict air circulation.
proper cooling at the searchlight will cause the OVER
3-4. Preliminary Control Settings
TEMP indicator to light.
The searchlight set may be operated in the spread,
Periodically check the OVER TEMP indicator
compact, or variable beam mode of operation. The pre-
during searchlight operation. The searchlight
liminary control settings and the starting procedure are
set will continue to operate even if an overheated
the same for all types of operation. Before starting the
condition exists. It is the responsibility of the
equipment (para 3-5), check the settings of the operating
operator to turn off the searchlight set if the
controls as follows:
OVER TEMP indicator lights.
Power switch . . . . . . . . . . . . . . . . . OFF.
Beam Width Adjustments
CIRCUIT TEST switch. . . . . . . . OPERATING POSITION.
Control switch . . . . . . . . . . . . . . . . LOCAL.
To adjust the beam width, start the searchlight set as
a. Compact Beam Operation. Place the beam switch
to the COMPACT BEAM position. The searchlight beam
If an abnormal result is obtained during the
width will automatically be adjusted until the narrowest
starting procedure, refer to the operational
beam width of approximately 1.0 is projected from the
checks (para 4-5, sequence Nos. 9 through 14).
b. Spread Beam Operation. Place the beam switch
in the SPREAD BEAM position and hold until the wid-
a. Start the vehicle power source.
est beam width (7) is projected from the searchlight.
c. Variable Beam Operation. A variable beam
Do not look directly into the searchlight beam.
width is obtained by holding the spring-loaded beam
Blindness or serious eye damage may result.
switch in the SPREAD BEAM (up) position. The light
Do not operate the searchlight in the compact
beam will spread from 1.0 to 7.0 width in 2 seconds.
beam visible mode while personnel are within 320
To hold the beam at any width between 1.0 and 7.0,
meters of the beam path.
release the beam switch, allowing it to return to the cen-
Personnel may suffer temporary flash blindness
ter position. The beam will stay at the desired width
at ranges in excess of 320 meters when the search-
until the beam switch is placed in either the
light is operated in either the compact beam or
BEAM or COMPACT BEAM position. If the switch
spread beam visible mode.
returned to SPREAD BEAM position, the searchlight
Do not operate the searchlight if the exhaust
beam will continue to spread to 7.0. The beam spread
blower does not operate.
may be stopped and held any number of times until
b. Set the power switch to either the INFRARED or
beam is fully spread at 7.0. To return the beam to 1.0
VISIBLE position, depending on the mode of operation
(compact narrow beam), it is necessary to set the beam
required. The xenon lamp will ignite within 3 seconds,
switch to the COMPACT BEAM position.