Acoustic noise measurements were made at crewmember locations on board an AC-119G and AC-130A gunship. Measurements were made during taxi, takeoff, climb, and cruise power settings. In addition, measurements were taken during firing of the four 7.62 mm miniguns on the AC-119G and the four 7.62 mm miniguns and four 2Omm vulcans on the AC-130A. Measurements were at typical crewmember locations throughout each aircraft during various weapon combination firing configurations. The data are presented in data zones and each zone is shown attenuated by each of four in-service ear protection devices. Specific ear protection recommendations are made for each aircraft for both ambient and gunfiring noise environments. (AN).


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