Effect of the new insulation liner on noise levels in the CH124B (Sea King) aircraft

Effet du nouvel isolant sur les niveaux de bruit dans l'aéronef CH124B Sea King


  1. Quémerais, B.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Crew members of the Seaking helicopter are exposed to elevated noise levels. To minimize noise levels as well as to insulate electrical wiring, the Seaking are equipped with a liner, which reduces noise. Recently the Sea King helicopters have been equipped with a new type of liner. Defence Research and Development Canada (DRDC) Toronto was asked to verify the noise levels in the Seaking during flight with the new liner and compare it with the old liner. Equivalent noise levels and octave band analysis were performed on a Seaking helicopter from Shearwater in February 5 and 6, 2008. Results showed that the new liner has absorption capabilities similar to or better than the old liner, except at the very low frequency of 8 Hz. Although at-ear sound pressure levels were not measured, it is reasonable to assume that they are acceptable with the new liner since they were acceptable with the old liner. Since sound pressure level are significantly higher when the cargo door is open, it was recommended to open the door only for a short period of time to avoid excessive exposure for the crewmen and troops.

Il y a un résumé en français ici.

Noise, Seaking, CH124B
Report Number
DRDC-TORONTO-TM-2008-182 — Technical Memorandum
Date of publication
01 Nov 2008
Number of Pages
Electronic Document(PDF)

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