MIL-DTL-12713E
3.1.2 Conformance. A sample shall be subject to conformance inspection in
accordance with 4.2.2.
3.2 Final assembly. Item shall conform to drawing 13032529.
3.3 Environmental.
3.3.1 Storage temperature. The quadrant shall be thermally stabilized at
temperatures of +160 ± 5 °F and -60 ± 5 °F for a minimum of 4 hours at each temperature.
Upon return to and stabilization at standard ambient temperature, +60 °F to +90 °F, the
quadrant shall show no evidence of physical damage or failure and meet the requirements
of 3.4 through 3.12 inclusive.
3.3.2 Operating temperature. The quadrant shall meet the requirements of 3.4
through 3.9 inclusive while exposed and thermally stabilized at temperatures of +145 ± 5
°F and -50 ± 5 °F for a period of not less than 4 hours at each temperature.
3.4 End-for-end. The quadrant shall end-for-end with a correction no greater than ±
0.4 mil.
3.5 Micrometer. An increase of 10 mils of the gunner's quadrant micrometer shall
result in a 10 mil increase in elevation within the width of a level vial graduation line as
read using the gunner's quadrant level vial.
3.6 High angle shoes. The gunner's quadrant shall provide the same reading within
±0.4 mils at 800 mils elevation using the quadrant's high angle shoes as when using the
low angle shoes.
3.7 Accuracy. The gunner's quadrant shall indicate angular readings from -10 mils
to 1600 mils (with respect to the horizontal plane) accurate within ±0.4 mils.
3.8 Torque. The running torque required to rotate the micrometer knob shall not
exceed 2.0 inch-pounds throughout the operating temperature range of -50°F to +145°F
inclusive.
3.9 Index alignment. With the micrometer dial indicating zero, the zero index line
on the level vial holder shall coincide with the index line on the arm within the width of the
index line on the arm.
3.10 Perpendicularity. The high angle shoes shall be perpendicular to the low angle
shoes within .0004 inches.
3.11 Bubble size. The level vial bubble length shall be .60 ± .02 inches at 75°F.
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