MIL-DTL-48558C
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 Elbow telescope. The telescope shall conform to drawing 13005104.
3.4 Orientation. The telescope shall be able to be mounted in the orientation as
stated below:
a. The telescope shall be able to be mounted on an appropriate fixture,
which locates and holds in place the locating pin in a horizontal plane and positions
the "V" Holder Assembly, drawing 10549272, 0.750 ± .002" above the pin and to
the rear.
b. The "V" located on holder assembly, drawing 10549272, shall be seated
over a 0.812" - 0.0005" diameter. The latch on the holder assembly shall be locked
to a 0.500 0.001" diameter.
c. A horizontal line of sight shall be provided which is parallel in azimuth to
the plane defined by surfaces "X" and "Y" on drawing 13005104.
3.4.1 Collimation of reticle. With the telescope oriented as stated in 3.4, the
boresight graduation cross shall coincide with a target 20 mils above the horizontal within
1.0 mil. The azimuth of the boresight cross shall coincide with a plane parallel to, but
offset from, the plane defined by the surfaces "X" and "Y" on drawing 13005104 within
1.0 mil.
3.5 Environmental.
3.5.1 Storage temperature. The telescope 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. Upon return to and stabilization at standard ambient temperature, +60°F to
+90°F, the elbow telescope shall meet the requirements of 3.7 through 3.13 inclusive. (See
6.6)
3.5.2 Operating temperature. The telescope shall meet the requirements of 3.10
inclusive while exposed to and thermally stabilized at temperatures of +145 ± 5°F and -50
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