Evaluation of Thermal Stress Induced by Helicopter Aircrew Chemical, Biological, Radiological (CBR) Protective Ensemble
Final rept. 3 Nov 87-17 Dec 88
NAVAL AIR DEVELOPMENT CENTER WARMINSTERPA AIR VEHICLE AND CREW SYSTEMS TECHNOLOGY DEPT
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The AP22P-9V Chemical, Biological, Radiological CBR Protective Assembly for helicopter aircrews has been evaluated for the additional thermal stress it imparts to users in a hot environment. The standard aircrew life support system for helicopters, based on the CWU-27P flight coverall, was employed as the experimental control. Two environmental conditions were studied 1 a simulated hot aircraft interior hot, with chamber temperatures maintained at dry bulb temperatures 32.8C and a wet bulb temperature 25.0C and 2 a control environment cool, with chamber temperatures maintained at 20.9C. Three males, aged 24-35 years, were exposed twice to each garmentenvironment condition combination, for a total of eight exposures each, except for one subject who was studied in cool conditions only once in each of the configurations, for a total of six runs. Heat durations were designed for 480 minutes. Comparison by ensemble show significant differences observed for exposure durations, while rectal temperatures were significantly different p0. 05 between ensembles only in hot conditions. Ambient conditions significantly impacted on nearly all measured parameters. The results indicate that the CBR ensemble represents a limiting factor in performance in a hot environment. Hyperthermia Chemical warfare Heat tolerance Physiology Heat stress.
- Chemical, Biological and Radiological Warfare
- Stress Physiology
- Protective Equipment