1、 MIL-H-48620 (2) 12 m 9997906 0484129 m MIL-H-48620 (AR) AMENDMENT 2 17 June 1991 SUPERSEDING AMENDMENT 1 29 August 1980 MILITARY SPECIFICATION HEAD ASSEMBLY (PERISCOPE M32CE1) This amendment forms a part of Military SpecificationMIL- H-48620 (MU), dated 30 April 1979, and is approved for use by the
2、 U.S. Army Armament, Munitions, and Chemical Command, and is available for use by all Departments and Agencies of the Department of Defense. PAGE 4 3.7.1, Delete and substitute: “3.7.1 Pre-vibration/pre-shock, dayliqht viewinq area. The incident line of sight shall emerge perpendicular to Datum Plan
3、e II y II in deflection within 0.20 mil and be elevated 20 mils f 0.30 mil Iabove“ the deflection plane as defined. The deflection direction is defined by the plane which is perpendicular to Datum 11 w II . The term “above“ indicates that the emerging line of sight is rotated away from Datum Plane l
4、lW1l. Plane IiYi1 and parallel to the intersection of Datum Planes “Yii distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-48620 (AR) AMENDMENT 2 PAGE 14 4.6.4.1, Delete and substitute: “4.6.4.1 Collimation, pre-vibratio
5、n/pre-shock, davliqht viewinq area. Prior to performing this test and the following tests of 4.6.4.2 and 4.6.4.3, disengage the index pin D“ from the index plate iiE1r of the test fixture and place the 10 second level on surface llC1l of the leveling base. The bubble of the level shall be centered w
6、ithin its graduation lines. If it is not, then adjustment is required in accordance with the procedures specified in paragraphs 7 and 8 of the set -up instructions contained on Drawing F8247391. With the index pin “D“ disengaged from the index plate an surface of the leveling base level, view throug
7、h the auto-collimator of the Support Assembly Collimator 10548767 positioned at the daylight viewing area and observe the projectedtarget image. The center of the target image (apparent intersecting point of the horizontal and verticle reticle lines) leaving the penta prism shall be elevated 20 mils
8、 above the reference line of sight of the viewing auto-collimator within the toleran-e specified in 3.7.1, when measured by means of the target ima-3 graduations and the auto-collimators micrometer knobs. Record this measurement for use in the subsequent test of 4.6.8. NOTE: If the auto-collimator c
9、ontains an erecting system, the center of the target image will appear 20 mils below the reference lines of sight of the auto-collimator. If it does not contain an erecting system, the center of the target will appear 20 mils above the reference line of sight of the auto-collimator.“ PAGE 21 * 4.6.1
10、0, line 2, Delete “0.25 and 0.50 and substitute “0.0 and 0.50“ NOTE: The margins of this amendment are markea with an asterisk or vertical lines to indicate where changes (additions, modifications, corrections, deletions) from the previous amendment were made. This was done as a convenience only, an
11、d the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. Custodian: Army - AR Preparing activity: Army - AR (Project 12 4 O-AB3 O) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
