NTSB Identification: ANC82FA056
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Saturday, July 10, 1982 in 38 SE BARROW, AK
Probable Cause Approval Date: 07/10/1983
Aircraft: BELL 212, registration: N59572
Injuries: 3 Minor,3 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

WHILE EXECUTING A PRECAUTIONARY LANDING AFTER HEARING A SCREECHING SOUND THE PLT LOST DIRECTIONAL CONTROL & THE HELICOPTER LANDED WHILE SPINNING. EXAMINATION REVEALED THAT THE PRIMARY TAIL ROTOR DRIVESHAFT QUILL COUPLING HAD FAILED. THE 204-040-604-5 FEMALE COUPLING HAD EXPERIENCED HIGH TEMPERATURES DURING OPERATION. CADIUM PLATING HAD BEGUN TO MELT ON EXTERIOR SURFACES. VISUAL OVERHEAT INDICATOR STRIPES REQUIRED BY THE COMPONENT REPAIR & OVERHAUL MANUAL WERE NOT PRESENT ON THE FEMALE COUPLING. THE 204-040-603-9 MALE COUPLING HAD EXTENSIVE HEAT & MECHANICAL DAMAGE.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..OVERTEMPERATURE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..FAILURE,TOTAL


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