MIL-DTL-48557B
(Copies of these drawings may be requested online at
pica.drawing.request@conus.army.mil or from U.S. Army ARDEC, ATTN: RDAR-EIS-
PE, Picatinny Arsenal, NJ 07806-5000)
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the
event of a conflict between the text of this document and the references cited herein, the
text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
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 Mount. The mount shall conform to drawing 13005103.
3.4 Environmental.
3.4.1 Storage temperature. While thermally stabilized at temperatures of +160 ± 5
°F and -60 ± 5 °F, the mount 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
mount shall meet the requirements of 3.7 through 3.11 inclusive.
3.4.2 Operating temperature. The mount shall meet the requirements of 3.9 while
exposed to and thermally stabilized at temperatures of +145 ± 5 °F and -50 ± 5 °F. Upon
return to and stabilization at standard ambient temperature, +60 °F to +90 °F, the mount
shall meet the requirements of 3.5 through 3.11 inclusive.
3.4.3 Shock. With a M137A2 panoramic telescope, 12984713, and M17A1
quadrant, 13005101, attached in the appropriate locations, the mount shall withstand a total
of 75 shock impulses along the 3 mutually perpendicular axes as defined in Figure 1 and
Figure 2. Each shock impulse shall be a half sine wave with a time duration of 0.010 ±
0.001 seconds and peak amplitude for each shock impulse as shown in Table I when
measured at the face of the counterbox of the M137A2 telescope (see Figure 2).
Subsequent to shock, the mount shall show no evidence of damage or physical failure and
shall meet the requirements of 3.5 through 3.11 inclusive.
TABLE I. Shock orientation and impulse at M137A2 counterbox.
Orientation
Shock impulse and direction
Number of impulses
-50 g s, +50 g s
Longitudinal
15 each direction
100 g s
Vertical
15 total
-100 g s, +100 g s
Transverse
15 each direction
3
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