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ASN Wikibase Occurrence # 30521
Last updated: 9 September 2021
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Date:01-JUN-1999
Time:14:48
Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell 206B JetRanger
Owner/operator:Chevron Usa, Inc.
Registration: N7131U
MSN: 4111
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:near Venice, Lousiana -   United States of America
Phase: En route
Nature:SU
Departure airport:West Delta 30, GM (NONE)
Destination airport:
Investigating agency: NTSB
Narrative:
About 150 feet agl and 60 knots, as the helicopter was accelerating, the pilot heard a loud 'bang,' and the low rotor rpm and engine out audio warning activated. The pilot initiated an autorotation to a grassy area, 'flared the aircraft, and placed it in six to eight inches of water.' A main rotor blade contacted the tailboom, partially separating it aft of the horizontal stabilizer. A passenger reported that the pilot 'pulled pitch right before the landing and we landed with one medium bump and then followed very quickly with another medium bump with a loud sound with it.' The passenger further reported that the landing attitude was 'relatively normal;' however, 'it was possibly a little more pitched up than normal.' An examination of the engine revealed that the Spur Adapter Gearshaft was fractured at the forward splines. According to the engine manufacturer's metallurgist, 'severe spline wear led to [the] spiral fatigue failure of the Spur Adapter Gearshaft and Compressor Adapter Coupling.' The reason for the spline wear was not determined.

Probable Cause: The pilot's improper touchdown procedure, resulting in a main rotor blade contacting the tailboom. Factors were the soft and wet terrain conditions, and the loss of engine power due to the spiral fatigue failure of the gas generator turbine shafting due to spline wear.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X18991&key=1
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=7131U


Revision history:

Date/timeContributorUpdates
27-Sep-2008 01:00 ASN archive Added
09-Apr-2015 22:21 Dr. John Smith Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Source, Damage, Narrative]
14-Dec-2017 08:27 ASN Update Bot Updated [Time, Operator, Nature, Departure airport, Source, Damage, Narrative]

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