MIL-DTL-48556B
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first
article inspection in accordance with 4.2.
3.2 Conformance. A sample shall be subject to conformance inspection in
accordance with 4.3.
3.3 Quadrant. The quadrant shall conform to drawing 13005102.
3.4 Environmental.
3.4.1 Storage temperature. The quadrant shall be thermally stabilized at
temperatures of +160 ± 5°F and -60 ± 5°F for a period of not less than 4 hours at each
temperature. While thermally stabilized at these temperatures, the quadrant shall be
inspected and shall not exhibit any signs of physical failure or damage. Upon return to and
stabilization at standard ambient temperature, +60°F to +90°F, the quadrant shall meet the
requirements of 3.5 through 3.14 inclusive.
3.4.2 Operating temperature. The quadrant shall meet the requirements of 3.8
through 3.14 inclusive while exposed to 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. Upon return to
and stabilization at standard ambient temperature, +60°F to +90°F, the quadrant shall meet
the requirements of 3.5 through 3.14 inclusive.
3.4.3 Shock. The quadrant shall withstand a total of 75 shock impulses along 3
mutually perpendicular axes as defined in Figure 1. Each shock impulse shall be a half
sine wave with a time duration of .010 ± .001 seconds and peak amplitude for each shock
impulse as shown in Table I. Subsequent to shock, the quadrant shall show no evidence of
damage or physical failure and shall meet the requirements of 3.5 through 3.14 inclusive.
TABLE I. Shock orientation and impulse.
Orientation
Shock impulse and direction
Number of impulses
Longitudinal
-90 g's, +90 g's
15 each direction
Vertical
-80 g's, +80 g's
15 each direction
Transverse
-80 g's
15 total
3
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