Serious incident Bell 412 N2258F, Thursday 2 December 1982

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Date:	Thursday 2 December 1982
Time:	14:00 LT
Type:	Bell 412
Owner/operator:	Petroleum Helicopters, Inc.
Registration:	N2258F
MSN:	33073
Year of manufacture:	1982
Total airframe hrs:	1071 hours
Engine model:	P&W PT6T-3B
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	None
Category:	Serious incident
Location:	Intercoastal Ci, LA - United States of America
Phase:	En route
Nature:	Unknown
Departure airport:	Abbeville, LA (0R3)
Destination airport:	Reno, NV (KRNO)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
WHILE IN CRUISE FLIGHT, THE PILOTS HEARD A LOUD POP AND FELT A SEVERE CYCLIC CONTROL VIBRATION. AN IMMEDIATE PRECAUTIONARY LANDING WAS MADE. AN EXAMINATION REVEALED THAT THERE WAS A FATIGUE CRACK IN THE TRAILING EDGE OF THE BLUE, MAIN ROTOR YOKE FLEXURE, PN 412-010-101-113. THE HELICOPTER AND THE FIXTURE HAD ACCUMULATED 1071 HRS OF FLIGHT TIME. THE LIFE LIMIT OF THE FAILED COMPONENT WAS 5000 HRS.

Probable Cause:

Accident investigation: