27 U-2s modified for higher cabin air pressure

The U.S. Air Force has modified 27 U-2s to increase the cockpit pressure from 4.4 pounds per square inch to more than 8 psi.

The Cabin Altitude Reduction Effort (CARE) program eliminates the risk of decompression sickness with modifications to the cockpit pressure regulator and safety valve, and engine bleed schedule.

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