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Miamiair wrote:Pete was climbing through 107,000 feet at Mach 4.17 on June 29th, 1967, he suffered a total electrical failure with all onboard systems shutting down.
The X-15 had an ejection seat designed to operate at speeds up to Mach 4 (4,480 km/h; 2,784 mph) and/or 120,000 feet (37 km) altitude, although it was never used during the program. In the event of ejection, the seat was designed to deploy fins, which were used until it reached a safer speed/altitude at which to deploy its main parachute. Pilots wore pressure suits, which could be pressurized with nitrogen gas.