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pressure suit[′presh·ər ‚süt]
a pilot’s personal equipment for protection against the dangers of low barometric pressure in case of depressurization of the cockpit at altitudes of more than 12-15 km. The pressure suit is a flight suit with an oxygen mask having surplus pressure or with a pressure helmet. It should exert even counterpressure over the entire surface of the body, not hinder the pilot’s movements, and be air- and vapor-tight. The pilot must be able to put it on and take it off without help from others. The maximum flight elevation in the pressure suit depends on the duration of the flight, how well the suit fits, and the physical strain on the pilot. The principle of action of the pressure suit is based on the fact that the surface of the body is subject to mechanical squeezing with specific pressure equal to the pressure of gas in the lungs. This is done by tension devices with pneumatic chambers inside. When they fill with gas, the chambers straighten out, increase in diameter, and stretch the fabric of the suit.
IU. F. ZAV’IALOV