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MIL-A-81973 (AS), MILITARY SPECIFICATION, AIRCREW AUTOMATED ESCAPE SYSTEMS, TEST VEHICLES FOR GROUND TRACK PERFORMANCETESTING, ROCKET AND/OR JET ENGINE PROPELLED; GENERAL SPECIFICATION FOR (31 MAY 1974)., This specification establishes the requirements for the design,construction and instrumentation of track-type test vehicles used in performance/service release testing, including underwater testing, of aircrew automated escapesystems in accordance with the test requirements of MIL-E-9426.