Robinson R66 - F081 Searchlight Installation

JUL 2020 Chapter 90 Police Version Page 90.17
90-170 F081 Searchlight Installation
CAUTION
The searchlight is very bright and can disorient other pilots or
ground personnel at long distances.
CAUTION
The searchlight beam is very hot. Exposure to the beam at
close range for more than a few seconds can result in burns.
A. D432-1 or -3 Gimbal Assembly Removal
1. Refer to Figure 90-1. Turn battery switch off & pull-out associated circuit breaker.
2. Disconnect large wiring connector from aft side of 024711-31 searchlight assembly.
3. Hinge aft right seat assembly forward. Disconnect searchlight wires connected to
D432-2 or -4 gearmotor assembly at connectors.
4. Cut and discard ty-raps as required and remove spirap to separate gearmotor and
searchlight harnesses. Pull gearmotor wiring thru hole in belly, toward searchlight.
5. Cut and discard safety wire securing mounting nut to adjacent screw.
6. Have a second person support the searchlight assembly, and prevent it from
rotating. Remove nut, washer, searchlight, and spacer washer.
B. D432-1 or -3 Gimbal Assembly Installation
1. Refer to Figure 90-1. Turn battery switch off & pull-out associated circuit breaker.
2. Install spacer washer (shoulder facing up), 024711-31 searchlight assembly, flat
washer, and nut.
3. Align the searchlight canister with the helicopter fore-to-aft axis. Have a second
person support the searchlight assembly, and prevent it from rotating. Special
torque nut to 20 ft-lb, install 0.032-inch diameter lockwire, and safety nut to
adjacent screw. Verify security.
4. Connect large wiring connector to aft side of searchlight assembly.
5. Hinge aft right seat assembly forward. Route D432-2 or -4 gearmotor assembly
wiring thru hole in belly and connect wiring at connectors.
6. Install spirap. Install one ty-rap near each end of spirap to secure harnesses
together. Cinch ty-raps until snug without over-tightening and trim tips flush with
heads. Hinge seat assembly forward.
7. Push-in associated circuit breaker & turn battery switch on. Perform appropriate
post-installation function checks. Turn battery switch off.
C. Schematic
Refer to Figures 90-10 and 90-11 for F081 searchlight installation wiring schematic.