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Vibration tests are performed for the purpose of:

A. Developing equipment that will function and cope with the vibrational exposures of the life cycle, including synergistic effects of other environmental factors, work cycle and maintenance. This method is limited to releasing one degree of mechanical freedom at a time. Method 527 contains additional guidelines for multiple degree testing.

B. Ensuring that equipment will function and deal with the vibrational exposures of the life cycle.

Appendix c

This appendix provides information on transportation environments that are intended to be useful in determining the vibration levels and duration of environmental life cycle events, and in determining the tests required for material development to operate in these environments and survive them.

Actual environments should be measured and life cycle facilities used to develop materials design criteria and to test criteria at every possible opportunity. Existing databases can sometimes be used instead of measurements. An initial environmental life cycle based on standard data can be useful as a planning tool. An initial life cycle definition can be used to concentrate limited resources on the most important vibration exposures to the material. The guideline for determining the values ​​of exposure to design and testing is presented below with descriptions of vibration environments of many typical life cycle events. It is advisable to set alternative criteria (levels and durations) or other guidelines for cases where measured data defining existing environments are not available.


Atmospheric explosion testing is performed for:


A. Test the ability of equipment to operate in an atmosphere of explosives in fuel, without causing ignition, or.

B. Prove that an explosion or fire reaction that occurs inside packaged and contained equipment, that does not come out of the test system.




This method applies to all equipment intended for use in the vicinity of atmospheric fuel atmospheres associated with aircraft fuels, vehicles and marine fuels at or above sea level. The second procedure specifically refers to the atmosphere in a space where flammable liquids or vapors are present, continuously or intermittently (e.g., in fuel tanks or inside fuel systems).

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