ENGINEERING TEST OF 152-MM GUN - LAUNCHER, XM81E12 AND RECOIL MECHANISM, XM551 (LIFE TEST).
Partial rept. no. 3, 1 Jan 66-1 May 67,
DEVELOPMENT AND PROOF SERVICES ABERDEEN PROVING GROUND MD
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This report summarizes the firing of the final 1047 rounds of a proposed 2000-round life test and supplements the information given in the 1st and 2nd partial reports. This test was conducted at Aberdeen Proving Ground from 1 January 1966 to 1 May 1967 to define the safety and reliability of the various components, i.e., gun - launcher, mount, and tubes. In addition, 226 rounds were fired from three selected facility tubes to gain added data on potential condemnation criteria. All components were inspected at selected intervals to detect evidence of incipient failure. The recoil mechanism and components of the gun - launcher were updated after 1087 rounds to correct previous defects and to provide an assembly identical to production models. Functioning of the weapon system after updating was satisfactory. The four life-test tubes all of which were fired using predominantly service pressure rounds, developed crack indications at critical locations between 450 and 500 rounds. These four tubes, as well as three selected facility tubes, were fired additional rounds under adverse conditions to define the significance of the crack indications. No definite deterioration was observed. On the basis of these firings, it is recommended that the gun - launcher tubes be safety-released for firing at least 200 conventional rounds without restriction. We also recommend that the breech mechanism be released for firing up to 600 conventional rounds. Author
- Guided Missile Launching and Basing Support