Adequate description of noise environment, as related to human exposure and hearing conservation, requires detailed information not only on spectrum and SPL, but also on temporal duration of SPL above hazardous levels with due regard for spectrum. Continuous magnetic tape recordings were made at six different microphone positions, four on the flight deck and two on the hangar deck, approximately 6 continuous hours per microphone position, totaling 35.7 hr. These recordings include all of the noise occurring during the time sampled, regardless of the type of ship's operation. The ship was under fully operational conditions, and the time samples were taken during the normal working day which included air operations. The recordings were analyzed in the laboratory by a Noise Cumulator to yield the time in minutes that the noise exceeded 7–11 pre‐set sound pressure levels above 80 db in each of three frequency bands; i.e., 30–17 500 cps, 300–1200 cps, and 1200–17 500 cps. The results of these analyses were plotted as a function of percent of accumulated time. Other analyses, employing more limited time samples were made but with greater frequency‐intensity detail.