Perko 9304, Operator'S Maintenance Manual, Page: 9 / 38

A remote ammeter is provided with the Power Supply. This instrument should be located in the pilot house
at a convenient location so that the pilot on watch can monitor the current being supplied to the lamp. A
current indication which falls within the 20 to 25 ampere range is satisfactory. Should the current indication
fall outside this range.
(2) Mechanical Controls . The mechanical controls provide the azimuth (horizontal) and elevation
(vertical) movement to the searchlight head. These controls are comprised of a handle assembly located
in the pilot house, a hollow tube and solid shaft, both of which extend from the handle assembly upward
through the pilot house ceiling to the base of the searchlight. The hollow tube is clamped to a bearing
housing fastened to the rotating yoke and base assembly. The lower end of this tube is clamped to the
handle assembly. Moving the handle in a horizontal plane moves the searchlight head horizontally. The
solid shaft is located inside the hollow tube. The lower end of this shaft is fastened to a miter gear such
that when the control handle is twisted, the solid shaft rotates within the tube. The upper end of the solid
shaft extends through the bearing housing previously mentioned and to a point approximately one inch
above the gear rack fastened to the bottom of the searchlight head housing. A fiber or nylon spur gear is
fastened to the upper end of the solid shaft, and this gear engages the gear rack. Twisting the control han-
dle provides rotary motion to the spur gear which causes the gear rack to move, thus imparting vertical
rotational movement to the searchlight head.
A ceiling mount is provided to cover the rough opening made in the ceiling to allow the shaft and tube to
pass through. This mount has a friction screw clamp to prevent the light from swinging freely in azimuth or
to lock it in a desired position.
This mechanical directional control assembly (known also optional as a lever gear control) is supported
from the rotating yoke and base assembly. Provision is made to allow additional support by the installation
of a solid rod and base plate extending from the bottom of the handle assembly to the pilot house control
console.
9