The X-31 completed its final research flight of 555 for the program.
The X-31 completed its final research flight (of 555 for the program). Unfortunately, during this flight the air data probe iced over – and there was not pitot heat – leading the flight control computer to derive incorrect data. The airplane went out of control as a result and the pilot ejected safely. The airplane crashed just north of Edwards AFB: it was a total loss.NASA Photo
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