LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
M17 Fire Control Quadrant
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Fire Control Elevation Level Assembly (1). The fire control level assembly consists of an elevation level
vial in a vial holder. The fire control level assembly is used in checking the M199 cannon in elevation.
Cover Assembly (2). The cover assembly of the M17 includes the counter windows, the radioactive
sources that illuminate the dials, the identification plate, and the instruction plate.
Correction Knob Assembly (3). The correction knob assembly is located on the left side of the M17
quadrant. It is used to set elevation correction increments on the correction counter.
Counter Assembly (4). The counter assembly consists of the elevation counter and the correction
counter. The counters are mounted in the housing assembly.
Base Assembly (5). The base assembly provides the mounting surface of the M17 quadrant. It also
contains a bearing necessary for accurate rotation when setting elevation.
Worm Shaft Assembly (6). The worm shaft assembly is located internally and is controlled by the
elevation knob. The worm shaft assembly is used to level the M17 quadrant in elevation by moving the
elevation and correction counters.
Housing Assembly (7). The housing assembly for the M17 quadrant contains an elevation knob
assembly, correction knob assembly, counter assembly, fire control level assembly, and a worm shaft