CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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The information disclosed herein is proprietary to MD Helicopters, Inc.
Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright © 1999−2016 by MD Helicopters, Inc.
SEARCHLIGHT
MAINTENANCE PRACTICES
1. Description and Operation
(Ref. Figure 201) The searchlight installation
consists of a control column mounted in the
floor on the right side of the pilot's compart
ment, dual lights positioned outside of the
compartment just below the control column,
and an extendible support column for connect
ing the dual lights to the control column.
A manually operated slidelock, located on the
control column and attached to the extendible
support column, is used to lower and extend
the dual lights below the landing gear skids or
floats during flight. A handle on the control
column is used to position the lights fore and
aft, as required, and can also be rotated in
place to tilt the external lights downward
approximately 120 degrees.
The tilting action is accomplished by a
two-piece shaft installed inside the control
and support columns; the upper shaft is
attached to the gear mechanism in the control
handle, and the lower shaft (which telescopes
over upper shaft) is attached to the gear
mechanism in the dual light assembly.
A switch inside the control column is actuated
whenever the searchlight is moved out of the
full up and locked position (by the slidelock),
and caused the SEARCHLIGHT EXT caution
light on the instrument panel to come on.
Other controls provided for the searchlight
consist of the SEARCHLIGHT PWR and
CONT circuit breakers on the instrument
panel, and the SEARCHLIGHT ON-OFF
switch on the control column.
A. Reference Data
(1). Information Pertaining to helicopter
structural components which inter
face with the searchlight installation
is in the Structural Repair Manual.
Information pertaining to standard
helicopter equipment is in CSP-
HMI-2 and CSP-IPC-4.
2. Searchlight − Fault Isolation
(Ref. Figure 202) Use information provided in
Table 201 for troubleshooting the searchlight
installation. For the searchlight system wiring
diagram.
Table 201. Troubleshooting − Searchlight
Symptom Probable Trouble Corrective Action
Looseness in slidelock; lower
support column will not stay in
retracted position (SEARCHLIGHT
EXT caution light comes on).
Setscrew not seated properly in
retaining hole of slidelock pin, or
setscrew not tight.
Reset setscrew so that it is seated
in retaining hole of slidelock pin.
Tighten setscrew.
SEARCHLIGHT EXT caution light
does not come on when searchlight
is extended or not fully retracted.
Lamp in EXT caution light assembly
cap is burned out or missing.
Replace lamp in EXT caution light
assembly cap.
External searchlights will not stay
adjusted in elevation.
Setscrews in searchlight rotating
blocks loose on inner shaft.
Tighten setscrews in searchlight
rotating blocks.
Toggle arm or SEARCHLIGHT
ON−OFF switch broken or
inoperative.
Excessive force applied to arm or
arm hit by heavy object.
Replace switch.
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