Military electronic equipment has become increasingly more sophisticated and, with greater complexity, very often less reliable. The project described here constitutes a complete effort, using as a test bed an AN/ALQ-131 electronic countermeasures external store, captive to an F-Ill F aircraft. The project included flight vibroacoustic data acquisition and reduction, development of a simulation approach designed to secure a high degree of matching field and laboratory environments, flight life simulation in the laboratory using a time compression factor of 20.5 to 1, and comparison of field and laboratory reliability. The simulation, completed rapidly and at low cost, resulted in very high correlation of field and laboratory failure types and a reasonable correlation of reliability. The relationships between vibration response and flight conditions measured during this project were considerably different than those predicted by the generic model for assembled external stores in MIL-STD-810D.

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