1、-_ -_ MIL-T-45bD (2) 12 9999906 0484131 b MIL-T-45688D (AR) AMENDMENT 2 “ 17 June 1991 SUPERSEDING AMENDMENT 1 20 October 1979 MILITARY SPECIFICATION TELESCOPES, ARTICULATED: M1.05 SERIES This amendment forms a part of Military Specification MIL- T-45688D(MU), dated 31 January 1974, and is approved
2、for use by the U.S. Army Armament, Munitions, and Chemical Command, and is available for use by all Departments and Agencies of the Department of Defense. PAGE 3 * 3.6, Delete and substitute: “3.6 Sealinq. The telescope shall show no evidence of leakage in excess of 0.1 pound per square inch gage wh
3、en subjected to an internal pressure of 5 I 0.10 pound per square inch (psig) for a minimum of 1 hour. The interior atmosphere of the accepted telescope shall contain nitrogen having a dew point at least as low as -25OF.“ PAGE 4 3.8.3, Line 2, Delete “0.05 mil“ and substiture “.lo mil“. PAGE 10 * 4.
4、6.5, Delete and substitute: “4.6.5 Sealinq - The internal pressurizing of the telescope to test sealing shall be performed with a special testing equipment conforming to 4.5.2.3.1. The diopter scale shall be turned to the CW stop and remain there throughout the pressure test. The pressure shall be a
5、pplied through the valve assembly. Pressurize the telescope with dry nitrogen gas to 5.0 rC 0.10 psig in accordance with the procedure for internal pressure testing on sheet 1 of drawing F8565556. The dry nitrogen gas shall have a dew point at least as low as minus 25OF. The applied pressure shall b
6、e retained for a minimum of 1 hour. Within the first 30 minutes of this 1 hour time period, the telescope eyepiece housing assembly shall be elevated through a minimum of 3 full excursions of the articulated joint cissembly, the reticle transfer lever shall be repositioned a minimum of 3 times. Any
7、evidence of leakage in the telescope at the end of the 1 hour time period, shall not exceed the tolerance specified in 3.6, as measured on the pressure gauge of th testing equipment.“ AMSC N/A 1 OF 2 FSC 1240 Distribution Statement A. Approved for public release; distribution is unlimited. Provided
8、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-45688D (AR) AMENDMENT 2 NOTE: The margins of this amendment are marked with an asterisk or vertical lines to indicate where changes (additions, modifications, corrections, deletions) from the previous amen
9、dment were made. This was done as a convenience only, and 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 1240-AB231 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
