Evaluation of the Modified Constant Wear Immersion Suit and Liners for Helicopter Aircrew


  1. Ducharme, M.B.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Many deficiencies have been identified with the current helicopter aircrew constant wear immersion suit (CWS). In collaboration with the CF Directorate of Technical Airworthiness (DTA) and Mustang Survival Inc., DRDC Toronto proposed a series of short-term solutions to resolve some of the most pressing problems. Those solutions include modified fire resistant neck and wrist seals (open seal design) to replace the rubber seals, and a redesigned liner. The objective of this report is to present the results of the evaluation of those solutions in three environmental situations: an aircraft simulated environment trial (trial #1); a cold water immersion trial (trial #2); and a flash fire trial (trial #3). Trial #1 was conducted in a climatic chamber at DRDC Toronto maintained at 25ºC. During the trial, 7 aircrews from HOTEF were tested during simulated aircrew activities (pilots and backenders) for their physiological heat load, thermal comfort, and sweat transfer into the clothing. Four suit configurations were tested: the current suit and liner (CC); the modified suit (with open neck seal) and Thinsulate® liners (quilted [MQ] and unquilted [MU] liners); and the modified suit and foam liner (MF). The results showed no differences in the heat load between conditions but a better sweat evaporation and transfer for the MU and MQ suits. Trial #2 was conducted in a wave pool at the CORD Group maintained at ~10ºC. During the trial, 7 aircrews from HOTEF were tested during a 1-hour i

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hypothermia;thermal comfort;survival time;flame resistance;heat stress
Report Number
DRDC-TORONTO-TR-2005-146 — Technical Report
Date of publication
01 Jul 2005
Number of Pages
Electronic Document(PDF)

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