Accident Bell 212 N59572, Saturday 10 July 1982

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Date:	Saturday 10 July 1982
Time:	18:20 LT
Type:	Bell 212
Owner/operator:	Kenai Air Alaska Inc.
Registration:	N59572
MSN:	30621
Year of manufacture:	1974
Total airframe hrs:	3467 hours
Engine model:	P & W PT6-T-3
Fatalities:	Fatalities: 0 / Occupants: 6
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	38 Se Barrow, AK - United States of America
Phase:	En route
Nature:	Unknown
Departure airport:	REMOTE LOCATION
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
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.

Probable Cause:

Accident investigation: