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MIL-STD-331 Testing

MIL-STD 331 describes tests used by the Department of Defense (DoD) to determine the safety, reliability and performance characteristics of weapon system fuses and fuse components at any stage in their life cycle. Tests are grouped by the environment to which the fuse is exposed or by the test purpose. Certain tests combine two or more environments; for example, vibration under exposure to extreme temperature. In these cases the test is grouped by the primary environment being evaluated.

The following is a summary of the five test groups of MIL STD 331:

Group A – Mechanical Shock Tests. Fuses are subjected to single or repeated impacts which generally simulate mishandling that might occur during the logistical or operational cycles.

Group B – Vibration Tests. Fuses are subjected to vibrations of specified frequency, amplitude and duration simulating conditions which are anticipated during transport or tactical use.

Group C – Climatic Test. Fuses are exposed to realistic extreme climatic conditions for specified periods of time.

Group D – Safety, Arming and Functioning Tests. These tests measure performance characteristics of fuses, such as, explosive safety, arming distance or time and output.

Group E – Aircraft Munitions Tests. Fuses associated with airborne munitions are subjected to impacts or forces which might be encountered in takeoff and landing, accidental separation of the munitions from the aircraft, or intentional safe jettison.

Group F – Electric and Magnetic Influence Tests. Fuses are subjected to environments such as electrostatic discharge (ESD), electromagnetic pulse (EMP), electromagnetic radiation (EMR), lightning, and so forth.

MIL-STD-331 is revised periodically. The existing versions of the standard include MIL-STD-331 C, MIL-STD-331 B and MIL-STD-331 A.

Keystone Compliance assists manufacturers with MIL-STD-331 compliance. This page lists every method and section of the standard for informational purposes. There may be methods and sections that fall outside of our scope. Please contact us for more information on how Keystone Compliance can assist you with identifying and fulfilling your MIL-STD-331 needs.