Downloaded from https://www.everyspec.com MIL-STD-81OC ~, 4.6.2.2 Equipment with isolators. Equipment designed for operational installation on vibration isolators shall also be subjected to a minimum rigidity endurance test with the isolators removed. This test shall be conducted according to part 2, procedure 1, tible 514.2-II, and curve AR of figure 514.z-2. At the conclusion of this test the equipment shall provide specified performance,in accordance with General Requirements, 3.2. 4.6.2.3 References a. Dreher, J.F., ,,Aircraft Equipment Random Vibration Test Criteria Based on Vibrations Induced by Turbulent Airflow Across Aircraft External Surfaces,“ Shock and Vibration Bulletin No.
43 (part 3, pp 127-139), NRL, Wash., DC, June 1973. b. Wafford, J.H., and Dreher, J.F., ,,Aircraft Equipment Random Vibration Test Criteria Based on Vibration Induced by Jet and Fan Engine Exhaust Noise,” Shock and Vibration Bulletin No. 43 (part 3, pp 141-151), NRL, Wash., DC, June 1973. c. Earls, D.L., !!Technical progreSS on New Vibration and Acoustic Tests,” .. for proposed MIL-STD-81OC entitled, EnvironmentalTest Methods, Journal of Environmental Sciences, pp 22-32, July/August 1973. ) 4.6.3 Procedure II. This procedure includes tests for three applications: a. Individual equipment items designed for installation in external stores carried on airplanes b.
Assembled external stores carried on airplanes c. .Assembledexternal stores carried on helicopters These tests apply to such stores as air launched missiles, bombs, dispensers, instrument pods and rocket launchers (see equipment categories d.1, d.2 and d.3 as applicable). 4.6.3.1 Procedure 11A. Equipment installed in external stores carried on airplanes. 4.6.3.1.1 Test conditions. The individual equipment test item (designed for instalIation in an external store) shal1 be subjected to broadband random vibration excitation. The power spectral density tolerances of. applied vibration shall be according to 4.5.2. The test item shall be attached to the vibration exciter according to 4.2.
Vibration shal1 be applied sequentialIY aIong each of the three orthogonal axes of the test item. 514.2-9 METHOD 514.2