NTSB Identification: FTW83IA084.
The docket is stored on NTSB microfiche number 21161.
Scheduled 14 CFR
Incident occurred Tuesday, January 11, 1983 in HOUSTON, TX
Aircraft: BELL 222, registration: N23021
Injuries: 6 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
THE HELICOPTER DEVELOPED A SEVERE VIBRATION WHILE IN FLT. THE PILOT EXECUTED AN EMERGENCY LANDING WITH NO FURTHER ACFT DAMAGE. AN EXAMINATION OF THE ACFT REVEALED THAT THE WALKING BEAM ASSEMBLY LOCATED BETWEEN THE SWASH PLATE AND ROTOR PITCH LINK HAD FAILED. FRACTURING ORIGINATED AT A CORROSION PIT ON A THREAD FLANK. MICROSCOPIC EXAMINATION OF THE THREADS REVEALED THAT LOCAL AREA OF CORROSION PITTING HAD OCCURRED WHERE THE SHOT PEEN BALLS HAD BEEN CONTACTING THE FLANKS OF THE THREADS.
The National Transportation Safety Board determines the probable cause(s) of this incident to be:ROTOR SYSTEM..FAILURE,TOTAL
AUTOROTATION..PERFORMED..PILOT IN COMMAND
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