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ASN Wikibase Occurrence # 137366
Last updated: 20 January 2020
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Date:11-JUL-2011
Time:10:19 LT
Type:Silhouette image of generic S76 model; specific model in this crash may look slightly different
Sikorsky S-76C++
Owner/operator:Héli-Union
Registration: F-HJCS
C/n / msn: 760740
Fatalities:Fatalities: 3 / Occupants: 11
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Andaman Sea, off Myanmar coast -   Myanmar
Phase: Take off
Nature:Non Scheduled Passenger
Departure airport:FPSO, Yetagun field, Andaman Sea
Destination airport:Kanbauk Airfield
Investigating agency: BEA
Narrative:
An S-76C++ crashed into the Andaman Sea sea off Myanmar when taking off from the Yetagun oil field, killing three people on board (the co-pilot and 2 pax downed). Eight were rescued after a delay initiating the FPSO ERP.
At 25 feet above the platform, during a PC2(Exposure) take off the pilot initiated a cyclic input, but one engine lost power and the aircraft was ditched.

Findings
The helicopter was certified, equipped and maintained in accordance with existing regulations and approved procedures.
The flight crew were properly licensed and qualified to conduct the flight.
Héli-Union holds a valid AOC.
The operations manual describes procedures in case of engine shutdown.
One engine flame out.
The pilot made an emergency landing (ditching).
The helicopter capsized after contact with the water.
All crew members and passengers evacuated.
All crew members and passengers boarded a life boat after 30 minutes.
Two passengers and the co-pilot drowned.
The wreckage was recovered on 26 November, 138 days after the accident.
Both engines were examined on 15 and 16 December.
The examination performed on the two engines determined an engine #2 in-flight shutdown.
The in-flight shutdown was due to a failed HP turbine blade.
The blade failure phenomenon had been identified in 2007.
Corrective action was current through the TU166 modification. This modification was mandated by EASA on single-engine applications, and monitored by EASA on twin-engine applications.
The F-HJCS helicopter had not been retrofitted.

Causes
The accident originated from engine n°2 failure.
The take-off procedure in performance class 2 with exposure time (in all take-off/ landing conditions ) does not guarantee a safe emerge forced landing.

Sources:

http://www.bea.aero/docspa/2011/f-cs110711/pdf/f-cs110711.pdf

http://www.chinadaily.com.cn/xinhua/2011-07-12/content_3161579.html
https://finance.yahoo.com/news/Helicopter-crashes-in-sea-off-apf-90313002.html?x=0&.v=1&utm_source=twitterfeed&utm_medium=twitter
https://blogs.voanews.com/breaking-news/2011/07/11/helicopter-crash-kills-3-in-burma-2/
http://www.irrawaddy.com/article.php?art_id=21670
Myanmar DCA

Accident investigation:
cover
  
Investigating agency: BEA
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
11-Jul-2011 10:45 gerard57 Added
11-Jul-2011 11:13 gerard57 Updated [Operator, Location, Source]
11-Jul-2011 15:00 RobertMB Updated [Time, Aircraft type, Operator, Other fatalities, Phase, Source, Narrative]
12-Jul-2011 12:11 Anon. Updated [Narrative]
12-Jul-2011 12:44 TB Updated [Aircraft type, Operator, Location, Source, Narrative]
12-Jul-2011 19:45 RobertMB Updated [Aircraft type, Operator, Location, Narrative]
15-Jul-2011 12:43 TB Updated [Aircraft type, Registration, Cn, Location]
15-Jul-2011 16:43 RobertMB Updated [Aircraft type, Registration, Location, Narrative]
15-Jul-2011 16:44 RobertMB Updated [Narrative]
27-Jul-2011 09:14 TB Updated [Time, Aircraft type, Registration, Location, Departure airport, Narrative]
04-Aug-2011 08:20 Anon. Updated [Registration, Cn]
04-Aug-2011 08:22 harro Updated [Source, Narrative]
04-Aug-2014 14:25 Aerossurance Updated [Time, Nature, Destination airport, Source, Narrative]
17-Apr-2016 17:10 Aerossurance Updated [Phase, Departure airport, Narrative]

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