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NTSB Report
April 23, 1991 · Bell 206B · N213AL
So. Marsh 275
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 23, 1991
Injury Outcomes
2 injuries (2 fatalities)
Location
So. Marsh 275
Aircraft
Bell 206B
Tail Number
N213AL
Operator
Offshore Logistics
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
FTW91FA070
THE PILOT DID NOT MAKE THE REQUIRED 15 MINUTE RADIO CHECK AFTER DEPARTURE FROM AN OFFSHORE RIG AND A RADIO AND AIR SEARCH WAS INITIATED. ABOUT TWO HOURS LATER, DEBRIS WAS FOUND FLOATING ABOUT THREE MILES FROM THE DEPARTURE POINT. RECOVERED DEBRIS INDICATED THAT THE AIRCRAFT HAD EXPERIENCED AN INFLIGHT SEPARATION OF THE VERTICAL FIN AND SUBSEQUENT MAST BUMPING. METALLURGICAL EXAMINATION OF THE VERTICAL FIN ATTACHMENT FITTINGS REVEALED THAT THEY HAD SEPARATED DUE TO FATIGUE INDUCED BY CORROSION AND CORROSION PITTING. THE EXAMINATION ALSO REVEALED THAT THE OPERATOR HAD UNSUCCESSFULLY ATTEMPTED TO COMBAT THE CORROSION DURING A REFURBISHMENT OF THE AIRFRAME. ALL OF THE FATIGUE FRACTURES APPEARED OLD AND ONE HAD PAINT IN THE FRACTURE.
NTSB Probable Cause
THE INFLIGHT STRUCTURAL FAILURE AND SEPARATION OF THE VERTICAL FIN WHICH LED TO A LOSS OF CONTROL AND MAST BUMPING. THE FAILURE OF THE FIN WAS DUE TO INADEQUATE CORROSION CONTROL EFFORTS BY THE OPERATOR.
Full Narrative
THE PILOT DID NOT MAKE THE REQUIRED 15 MINUTE RADIO CHECK AFTER DEPARTURE FROM AN OFFSHORE RIG AND A RADIO AND AIR SEARCH WAS INITIATED. ABOUT TWO HOURS LATER, DEBRIS WAS FOUND FLOATING ABOUT THREE MILES FROM THE DEPARTURE POINT. RECOVERED DEBRIS INDICATED THAT THE AIRCRAFT HAD EXPERIENCED AN INFLIGHT SEPARATION OF THE VERTICAL FIN AND SUBSEQUENT MAST BUMPING. METALLURGICAL EXAMINATION OF THE VERTICAL FIN ATTACHMENT FITTINGS REVEALED THAT THEY HAD SEPARATED DUE TO FATIGUE INDUCED BY CORROSION AND CORROSION PITTING. THE EXAMINATION ALSO REVEALED THAT THE OPERATOR HAD UNSUCCESSFULLY ATTEMPTED TO COMBAT THE CORROSION DURING A REFURBISHMENT OF THE AIRFRAME. ALL OF THE FATIGUE FRACTURES APPEARED OLD AND ONE HAD PAINT IN THE FRACTURE.
Flight
Event TypeAccident
Event Time12:45 UTC
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206B
Tail NumberN213AL
Aircraft CategoryHeli
DamageDestroyed
OperatorOffshore Logistics
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20 · Turboshaft · 400
Seats5
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 43 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind10° @ 10 kt
Visibility7 sm
CeilingOvercast 2000 ft
Altimeter29.00 inHg
Weather SourceWIT