On 24 January 1963 a United States Air Force Boeing B-52C Stratofortress with nine crew members on board lost its vertical stabilizer due to buffeting stresses during turbulence at low altitude and crashed on Elephant Mountain in Piscataquis County, Maine, United States, six miles from Greenville. The pilot and the navigator survived the accident.
The crew's training mission was called a Terrain Avoidance Flight to practice techniques to penetrate Advanced Capability Radar undetected by Soviet air defense during the Cold War. ACR training flights had already been made over the West Coast of the United States on Poker Deck routes. This was to be the first low-level navigation flight, utilizing terrain-following radar, in the Eastern United States.
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