Downloaded from https://www.everyspec.com MIL-STD-810D~ 19 July 1983 METHOD 519.3 GUNFIRE VIBRATION, AIRCRAFT m SECTION I I-1 I-2 I-3 PURPOSE . . . . .’...’.... . . . . . . . . . . ...519.3-1 ENVIRONMENTAL EFFECTS . . . . . . . . . . . . , . . . - . 519..3-1 GUIDELINES FOR DETERMINING TEST PROCEDURES AND TEST CONDITIONS . . . . . . . . . . . . 519.3-1 SPECIAL CONSIDERATIONS . ,.... . . . . . . . . . . . . . 519.3-15 PREFERENCES . . . . . . . . .... . .. . . . . . .. . . . . .519.3-16 SECTION II . I-4 ,.. F-5 , .11-1 II-2 II-3 11-4 APPARATUS . . . ... . . . . . ..:’ . . . . . . . .519.3-17 PREPARATION FOR.TEST . . . . . . . . . . . . . . . . . ..519.3-17 PROCEDURES . . .. . . . . . . . . . .
. . . . . . . . .519.3-17 INFORMATION TO BE RECORDED . . . . . . . . . . . . . . . 519.3-18 . SECTION I fI-1 EJ81QSE. The gunfire.vibration test is performed to assure.that equipment mounted in an airoraft with onboat’dguns can withstand the vibration levels caused by the.overpr.esaurepulses emitting from the gun muzzle. I-? The vibration resulting from repetitive gun blast pulses is two orders of magnitude above normal flight vibration levels. Gunfire vibration will cause the structure and equipment to respond in a violent manner. This response can cause intermittent electrical contact, catastrophic electrical failures, fatigue failures. hydraulic malfunctions, and structural (.. , . .
I-3 ~~. This test method should be applied at the end of the tailoring process described in section 4 of this standard. a. This test applies to equipment installed in aircraft that carry and fire onboard guns. b. . . . Eestrlctlona. When an item will be installed in a location where the gunfire vibration is less than normal flight vibration, no gunfire testing is recommended. Use method 514.3. c. ~. .This test should be’conducted early on in the testing of the test item because of the very severe nature of the gunfire-induced vibration environment. This is provided that the specific test item does not need to be tested in any other environmental test sequences. NOTE:
Items tested in their vibration isolation mountings should also pass the minimum integrity requirements of method 514, paragraph I-3.2.12. .. d. jest varla t.. The test variables are vibration spectrum end ,.: intensity, and test duration. 19 July 1983 519.3-1 METHOD 519.3