Downloaded from https://www.everyspec.com MIL-STD-81OC . 4.6.3.3.3 Cycling test. The test item shall be subjected to vibration cycling in each of three orthogonal axes. The frequency of applied vibra- tion shall be cycled at a logarithmicrate between the frequency limits and at the vibratory acceleration levels as shown on figure 514.2-4B.” The cycling period and rate shall be determined from table 514.2-IVA. 4.6.3;3.4 Dwell test. The test item shall be subjected to vibration dwell ,ineach of three orthogonal axes.
The dwell test shall be conducted at the four frequencies and at the vibratory acceleration levels as shown on figures 514.2-4D, 514:2-4E, 514.2-4F for the particular weight of the test item. (The minimum acceleration level shall be O.5g for all dwell tests.) The dwell period at each frequency shall be determined from curve A of figure 514.2-4C. NOTE : For test items such as rocket launchers, which are flown to the target area loaded and come back empty, it is recommended that one-half of the cycling test be applied to a loaded launcher and the other half be applied to an empty launcher. 4.6.4 ~. (See equipment categories d.1 and d.2.) 4.6.5 Procedure IV (Former 4.9 DISCONTINUED).
[See equipment categories d.1 and d.2.) , 4.6.6 Procedure V. Equipment installed in ground launched missiles (without vibration isolators, equipment category e.) 4.6.6.1 Part 1. Proceed the same as in 4.5.1.3. The test level shall be according to one specified curve P through U from table 514.2-V and figure 514.2-5. Test time schedules shall be as listed for part 1 of procedure V as specified in table 514,2-V. 4.6.6.2 Part 2. Proceed the same as in 4.5.2. The test level shall be according to one specified in curve AE through AP from table 514.2-V and figure 514.2-5. Test time schedules shall be as listed for part 2 of procedure V as specified in table 514.2-V. 4.6.7 Procedure VI.
Equipment installed in ground launched missiles (with vibration isolat”ors,equipment category e.) 4.6.7.1 Part 1. Test items normally provided with vibration isolators shall be =ed with the isolators in place as in 4.5.1.3. Test levels shall be according to one specified curve P through U from figure 514.2-5. Test time schedules shal1 be as listed for part 1 of procedure VI as speci- fied in table 514.2-V. . 514.2-15 METHOD 514.2 D