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ASN Wikibase Occurrence # 186855
Last updated: 13 October 2019
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Date:29-APR-2016
Time:11:55 LT
Type:Silhouette image of generic AS32 model; specific model in this crash may look slightly different
Eurocopter EC 225LP Super Puma Mk2+
Owner/operator:CHC Helikopter Service
Registration: LN-OJF
C/n / msn: 2721
Fatalities:Fatalities: 13 / Occupants: 13
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Tury just west of Sotra, near Bergen -   Norway
Phase: En route
Nature:Non Scheduled Passenger
Departure airport:Gullfaks B offshore installation
Destination airport:Bergen-Flesland Airport (BGO/ENBR)
Narrative:
Flight HKS241 impacted the rocky shoreline of the Tury Island, off Norway. All thirteen occupants were killed. The helicopter operated on a round trip from Bergen-Flesland Airport, Norway to the Gullfaks B offshore installation in the North Sea. A video shot by an eyewitness show the main rotor falling, separated from the helicopter.

The recordings on the CVFDR showed that everything appeared to be normal until a sudden catastrophic failure developed in 1-2 seconds. The CVFDR recordings ended abruptly at the same time.

CAA Norway issued a Safety Directive on 29 April 2016, followed by one from the UK CAA, temporarily prohibiting the use of the EC225LP for commercial air transport.

AIBN report 1 May 2016 that the CVFDR has been sent to the UK for analysis and major items of hardware are being examined in Bergen. On 2 May 2016 they confirm the CVFDR data has been downloaded, is of 'good quality' and has been retuned to Norway for analysis. An Emergency AD was issued by EASA on 3 May 2016 with a second on 1 June 16 regarding suspension bar fittings.

The AIBN issued a first Preliminary Report on 13 May 2016 (updated 2 weeks later and a third on 1 June 16). Following the third an EASA Flight Prohibition AD was issued. AIBN announced on 28 June 2016 that a 2nd stage planetary gear failure was 'most likely'.

On 7 October 2016 EASA replaced the Flight Prohibition AD with a new AD that removed one type of bearing and introduced extra maintenance checks.

On 28 April 2017 the AIBN issue a further 102 page preliminary report.

On 7 July 2017 it was announced the remaining operational directives would be lifted.

The AIBN final report was issued 5 July 2018 with 12 recommendations.

- Probable Cause : "The accident was a result of a fatigue fracture in a second stage planet gear in the epicyclic module of the main rotor gearbox. Cracks initiated from a micro-pit at the surface and developed subsurface to a catastrophic failure without being detected."

Sources:

https://gfx.nrk.no/RXL6AiBqdFbRuDwJp1WiIQPQbpWnljeUPqsHw2C6yjhA
https://www.abcnyheter.no/nyheter/2016/04/29/195213989/minst-13-personer-om-bord-i-ulykkeshelikopter-i-hordaland
http://www.aftenposten.no/nyheter/iriks/Helikopterstyrten-i-Hordaland---direkteblogg-8450661.html#xtor=RSS-3
https://www.nettavisen.no/nyheter/direkte-helikopterstyrten-i-hordaland/3423219023.html

Sept 2019: https://www.flightglobal.com/news/articles/airbus-helicopters-finds-root-cause-of-turoy-h225-cr-460792/

Data __________________________
https://www.flightradar24.com/data/aircraft/ln-ojf#98ee4bc
http://aerossurance.com/news/ec225-main-rotor-mgb-design/

Airbus Helicopters _______________________
http://www.airbus.com/helicopters/info-centre/ln-ojf-accident-investigation-status/norway-statement.html
https://www.airbus.com/helicopters/info-centre/ln-ojf-accident-investigation-status.html

CAA Norway (Luftfartstilsynet)_____________
https://translate.google.fr/translate?sl=auto&tl=en&js=y&prev=_t&hl=fr&ie=UTF-8&u=http%3A%2F%2Fwww.luftfartstilsynet.no%2Faktuelt%2FFlygeforbud_for_EC225LP&edit-text=&authuser=0
https://translate.google.fr/translate?hl=fr&sl=no&tl=en&u=http%3A%2F%2Fwww.luftfartstilsynet.no%2Faktuelt%2FHelikopter_har_styrtet_ved_Tur%C3%B8y_utenfor_Bergen1

EASA _______________________________
https://ad.easa.europa.eu/ad/2016-0089-E
https://ad.easa.europa.eu/ad/2016-0103-E
https://ad.easa.europa.eu/ad/2016-0104-E
https://ad.easa.europa.eu/ad/2016-0199

AIB-N ________________________________
https://www.aibn.no/Aviation/Investigations/16-286
https://www.aibn.no/About-us/Nyhetsarkiv/The-Helicopter-Accident-The-work-continues (1 May 16)
https://www.aibn.no/About-us/Nyhetsarkiv/The-Helicopter-Accident-Data-from-the-combined-FDR-and-CVR-retrieved-Data-is-of-good-quality_ (2 May 16)
https://www.aibn.no/About-us/Nyhetsarkiv/The-Helicopter-Accident-The-search-for-components-is-resumed (6 May 2016)
https://www.aibn.no/About-us/Nyhetsarkiv/The-Helicopter-Accident-Preliminary-report (13 May 16)
https://www.aibn.no/Aviation/Investigations/16-286 (updated preliminary report 27 May, 1 June and 28 June 16 and of 28 April 2017)
https://www.aibn.no/Aviation/Published-reports/2018-04 (Final Report 5 July 2018)

http://aerossurance.com/news/ec225-lnojf-investigation/
http://aerossurance.com/helicopters/as332l2-225-planet-gear/
http://aerossurance.com/helicopters/super-puma-epicyclic-gear-hm/
http://www.statoil.com/en/NewsAndMedia/News/2016/Pages/Report23Sept2016.aspx
http://www.caa.co.uk/News/Restrictions-on-H225LP-and-AS332L2-Super-Puma-helicopters-to-be-lifted(1)/


Images:


Revision history:

Date/timeContributorUpdates
29-Apr-2016 11:58 whiteshark Added
29-Apr-2016 12:01 whiteshark Updated [Registration, Narrative]
29-Apr-2016 13:38 whiteshark Updated [Narrative]
29-Apr-2016 13:47 Iceman 29 Updated [Embed code]
29-Apr-2016 14:10 Iceman 29 Updated [Cn, Embed code, Narrative]
29-Apr-2016 15:55 Iceman 29 Updated [Source, Embed code, Narrative, Photo, ]
29-Apr-2016 18:04 TB Updated [Time, Aircraft type, Operator, Other fatalities, Nature, Source, Narrative]
29-Apr-2016 19:14 harro Updated [Operator, Departure airport, Destination airport, Narrative]
29-Apr-2016 19:16 harro Updated [Source, Narrative]
30-Apr-2016 18:18 AvidFlyer Updated [Narrative]
30-Apr-2016 18:20 harro Updated [Narrative]
30-Apr-2016 18:25 harro Updated [Source]
01-May-2016 13:19 Aerossurance Updated [Location, Departure airport, Source, Embed code, Narrative]
02-May-2016 13:51 Aerossurance Updated [Source, Narrative]
02-May-2016 13:51 Aerossurance Updated [Source, Narrative]
03-May-2016 21:30 Aerossurance Updated [Source, Narrative]
06-May-2016 13:52 Aerossurance Updated [Source]
13-May-2016 19:49 Aerossurance Updated [Time, Source, Narrative]
14-May-2016 20:34 harro Updated [Narrative]
23-May-2016 22:33 Aerossurance Updated [Source, Narrative]
27-May-2016 15:31 Aerossurance Updated [Source, Narrative]
01-Jun-2016 20:00 Aerossurance Updated [Source, Narrative]
02-Jun-2016 17:03 Aerossurance Updated [Source, Narrative]
08-Jun-2016 07:33 Anon. Updated [Narrative]
28-Jun-2016 20:59 Aerossurance Updated [Source, Narrative]
03-Jul-2016 10:44 Aerossurance Updated [Embed code]
03-Jul-2016 11:12 Aerossurance Updated [Source]
23-Sep-2016 10:22 Aerossurance Updated [Source]
08-Oct-2016 06:25 Aerossurance Updated [Source, Narrative]
10-Oct-2016 16:01 Anon. Updated [Phase]
28-Apr-2017 11:04 Aerossurance Updated [Phase, Source, Narrative]
29-Apr-2017 16:21 Aerossurance Updated [Source]
07-Jul-2017 19:47 Aerossurance Updated [Source, Narrative]
08-Jul-2017 00:24 Iceman 29 Updated [Embed code]
09-Oct-2017 17:01 Iceman 29 Updated [Embed code]
29-Apr-2018 09:06 Aerossurance Updated [Source]
05-Jul-2018 16:22 Aerossurance Updated [Source, Narrative]
07-Jul-2018 19:56 Captain Adam Updated [Narrative]
12-Sep-2019 09:20 Iceman 29 Updated [Source, Embed code]

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