Downloaded from https://www.everyspec.com D MIL-STD-81OC parts. Additional factors to be considered shall include attenuation or amplification and filtering by structural members. Guidance for selecting vibration curves with respect to equipment location or.application is given in the tables. Applicable test curves for each equipment category are shown on the figures. 3.4 Procedure selection. The equipment specificationor test plan shall identify which tests are to be imposed on the equipment by specifying the applicable procedure, table, ,figure, and test curve. 3.4.1 Example. Select the the following application: test conditions for equipment to be used in Category:
Equipment installed in a propellor airplane Equipment location: Forward half of fuselage Equipment mounting: On vibration isolated panel Referring to table 514.2-II, the above identification specifies tbe follow- ing test conditions: Procedure I ) Part 1 [curve C) Part 2 (curve B) Part 1 specifies a resonance search, resonance dwell and sinusoidal vibra- tion cycling to the level of curve C from figure 514.2-2-within the time schedule specified for part 1 on table 514.2-II.
Next, with vibration isolators removed in accordance with note 2, part 2 is performed the same as part 1 but to the test level or curve B from figure 514.2-2 within the time schedule specified for part 2 from table 514.2-11. 4. PROCEDURES. The basis for selecting a test procedure for a particular equipment category shall be according to 3. The vibration environment, specified by the curve selected from applicable tables in accordance with 3, shall be applied ‘toeach of the three mutually perpendicular axes of the test item. (For assembled external stores, see procedure IIB.) The entire sequence of tests may be accomplished for any one axis before chan~ine to the next axis.
The transverse motion at the input monitoring poin~(s; shal1 be minimized, and should be limited to 100 p~rcent of the shall be balanced to reduce input motion except that reaction machines transverse motion *1O percent. 514.2-3 METHOD 514.2