Date: December 01, 1974
Time: 19:26
Location: Bear Mountain, Thiells, New York
Operator: Northwest Orient Airlines
Flight #: 6231
Route: New York City, NY - Buffalo, NY
AC Type: Boeing B-727-251
Registration: N274US
cn / ln: 20296
Aboard: 3   (passengers:0  crew:3)
Fatalities: 3   (passengers:0  crew:3)
Ground: 0
Summary: The aircraft stalled in a climb from which recovery was not effected. The loss of control of the aircraft because the flight crew failed to recognize and correct the aircraft's high-angle-of-attack, low-speed stall and its descending spiral. The stall was precipitated by the flight crew's improper reaction to erroneous airspeed and Mach indications which had resulted from a blockage of the pitot heads by atmospheric icing. Contrary to standard operational procedures, the flight crew had not activated the pitot head heaters.

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