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ASN Wikibase Occurrence # 38488
Last updated: 27 July 2017
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Date:18-MAY-1983
Time:10:56
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Aérospatiale AS 350D Astar
Owner/operator:Petroleum Helicopters Inc
Registration: N36062
C/n / msn: 1237
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Category:Accident
Location:Venice, Plaquemines Parish, Louisiana -   United States of America
Phase: Landing
Nature:Ferry/positioning
Departure airport:West Delta, Gulf of Mexico
Destination airport:Venice, Louisiana (7R1)
Investigating agency: National Transport Safety Bureau (NTSB)
Narrative:
THE AIRCRAFT CRASHED INTO A SWAMP WITH LOW ROTOR RPM AFTER A FAILURE OF THE ACCESSORY GEARBOX POWER OUTPUT GEAR. THE PILOT RADIOED AN EMERGENCY CALL SAYING HE WAS EXPERIENCING SEVERE VIBRATIONS AND WAS LANDING. A FEW SECONDS LATER, HE RADIOED THAT HE WAS CRASHING. RESCUE AIRCRAFT FOUND THE HELICOPTER ON ITS RIGHT SIDE, PARTIALLY IN WATER. THERE WAS EVIDENCE THAT THE FAILED GEAR BOX RESULTED IN LOW ROTOR SPEED WHICH WAS NOT RECOVERED DUE TO LACK OF ALTITUDE AT THE TIME OF FAILURE. AN INVESTIGATION REVEALED THAT THE POWER TURBINE OUTPUT (PTO) GEAR, PN 4-081-044-15, FAILED FROM LOW STRESS, HIGH CYCLE FATIGUE. THE FATIGUE ORIGINATED AT A POINT WERE REHARDENING BURNS CAUSED BY GRINDING WERE PRESENT. THIS GRINDING WAS ACCOMPLISHED DURING MANUFACTURING OF THE GEAR AFTER IT HAD BEEN CARBURIZED. THE PROCEDURE SHOULD HAVE BEEN ACCOMPLISHED PRIOR TO CARBURIZATION WHEN THE MATERIAL SURFACE WAS MUCH SOFTER & LESS SUSCEPTIBLE TO GRINDING BURNS.

Despite being apparently written off (damaged beyond repair), the registration N36062 was cancelled by the FAA on March 31 1992 as "exported to France". This was later confirmed, as an AS.350D Astar c/no 1237 was registered in France as F-WYMG. Rebuilt as an AS.350BA, and later sold to Germany as D-HEPT: still currently registered

Sources:

1. NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001214X42970
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=36062
3. http://planecrashmap.com/plane/la/N36062/
4. http://aircrashed.com/aircraft/aFTW83FA238.shtml
5. http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=11584
6. http://www.helis.com/database/cn/18167/

N36062 later became F-WYMG and the D-HEPT. Seen here as D-HEPT at Hanover on March 4 2009

Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
27-Jun-2014 19:02 Dr. John Smith Updated [Time, Aircraft type, Operator, Location, Departure airport, Destination airport, Source, Embed code, Narrative]
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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