VERNAL, UT, USA
N1086Y
BELL 206B
PLT STATED THAT WHILE ON A HEADING OF 050 DEGS (WIND FROM 270 DEGS AT 5 KTS) THE ACFT BEGAN TO SHUDDER AND VEERED TO THE RIGHT. PLT ATTEMPTED REMEDIAL ACTION BUT ACFT CONTINUED DESCENDING IN A RIGHT SPIRAL TO GROUND CONTACT. EXAMINATION OF THE HELICOPTER DID NOT DISCLOSE ANY MECHANINCAL FAILURE/MALFUNCTION. BELL HELICOPTER TEXTRON, INC., PUBLISHED INFORMATION LETTER 206-84-41 DATED JULY 6, 1984 IN WHICH IT DESCRIBES UNANTICIPATED RIGHT YAW AS, '... THE OCCURRENCE OF AN UNCOMMANDED RIGHT YAW RATE WHICH DOES NOT SUBSIDE OF ITS OWN ACCORD AND WHICH, IF NOT CORRECTED CAN RESULT IN LOSS OF AIRCRAFT CONTROL.' THE PLT WAS IN THE POST SOLO PHASE OF HIS HELICOPTER TRAINING. ONE PASSENGER WAS ON BOARD WHEN THE ACCIDENT OCCURRED.
Source: NTSB Aviation Accident Database
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