ASN Wikibase Occurrence # 150315
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| Date: | 22-OCT-2012 |
| Time: | 15:30 LT |
| Type: |  Eurocopter EC 225LP Super Puma Mk2+ |
| Owner/operator: | CHC Scotia |
| Registration: | G-CHCN |
| MSN: | 2679 |
| Fatalities: | Fatalities: 0 / Occupants: 19 |
| Other fatalities: | 0 |
| Aircraft damage: | Written off (damaged beyond repair) |
| Category: | Accident |
| Location: | 32 nm SW of Sumburgh, Shetland Islands -
 United Kingdom
|
| Phase: | En route |
| Nature: | Offshore |
| Departure airport: | Aberdeen-Dyce Airport (ABZ/EGPD) |
| West Phoenix drilling rig | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While operating over the North Sea, in daylight, the crew experienced a loss of main rotor gearbox oil pressure, which required them to activate the emergency lubrication system. Shortly after the system had activated, a warning illuminated indicating that the emergency lubrication system had failed. This required the crew to ditch their helicopters immediately in the North Sea, which was done successfully and all persons on board were recued.
The loss of oil pressure on helicopters was caused by a failure of the bevel gear vertical shaft in the main rotor gearbox, which drives the oil pumps. The shafts had failed as result of a circumferential fatigue crack in the area where the two parts of the shaft are welded together and was due to corrosion.
The emergency lubrication system did activate. The failure warning was a false indication.
See also G-REDW.
Sources:
http://www.aaib.gov.uk/publications/special_bulletins/s6_2012___ec225_lp_super_puma__g_chcn.cfm
http://www.aaib.gov.uk/publications/special_bulletins/s7_2012___ec225_lp_super_puma__g_chcn.cfm
https://www.gov.uk/aaib-reports/s2-2013-ec225-lp-g-redw-and-g-chcn-22-may-2012
https://www.gov.uk/aaib-reports/aar-2-2014-g-redw-and-g-chcn-10-may-2012
http://aerossurance.com/news/aaib-report-ditchings-ec225-g-redw-10-may-2012-g-chcn-22-oct-2012/
https://www.stepchangeinsafety.net/about/EC225information.cfm
http://www.maritimeprofessional.com/news/offshore-helicopter-ditches-saved-merchant-228671
http://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-20033833
http://www.dailypost.co.uk/news/uk-world-news/2012/10/22/crew-return-from-ditched-helicopter-55578-32084474/
http://www.dailymail.co.uk/news/article-2222125/Super-Puma-helicopter-Dramatic-moment-19-oil-rig-workers-rescued-emergency-landing.html
http://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-20054080
Accident investigation:
 |
|
Safety recommendations:
Safety recommendation 2012-034 issued by AAIB to EASA
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Oct-2012 11:42 | gerard57 | Added |
| 22-Oct-2012 11:51 | harro | Updated [Aircraft type, Narrative] |
| 22-Oct-2012 12:02 | RobertMB | Updated [Time, Aircraft type, Registration, Operator, Narrative] |
| 22-Oct-2012 13:35 | gerard57 | Updated [Departure airport, Source, Narrative] |
| 23-Oct-2012 09:27 | vibrex | Updated [Registration] |
| 24-Oct-2012 01:04 | steve the humberside | Updated [Cn] |
| 24-Oct-2012 06:00 | MarkStep | Updated [Source] |
| 24-Oct-2012 10:37 | Dr. John Smith | Updated [Embed code] |
| 24-Oct-2012 13:55 | vibrex | Updated [Source, Embed code, Narrative] |
| 25-Oct-2012 11:40 | vibrex | Updated [Source, Embed code, Narrative] |
| 01-Nov-2012 08:31 | TB | Updated [Operator, Location, Destination airport, Source, Embed code, Damage, Narrative] |
| 27-Nov-2012 06:54 | Masen63 | Updated [Source, Narrative] |
| 18-Dec-2012 08:54 | Dr. John Smith | Updated [Operator, Location, Departure airport, Source, Embed code, Narrative] |
| 18-Dec-2012 08:57 | Dr. John Smith | Updated [Nature, Embed code] |
| 19-Dec-2012 12:20 | TB | Updated [Operator, Location, Source, Embed code, Narrative] |
| 27-Nov-2013 14:50 | TB | Updated [Damage] |
| 03-Aug-2014 19:08 | Aerossurance | Updated [Nature, Source, Narrative] |
| 25-Aug-2014 13:24 | TB | Updated [Location] |
| 18-Sep-2015 18:28 | Dr. John Smith | Updated [Source, Embed code] |
| 18-Sep-2015 18:28 | Dr. John Smith | Updated [Embed code] |
| 17-Oct-2015 15:47 | Aerossurance | Updated [Location] |
| 02-Oct-2016 13:39 | Aerossurance | Updated [Source] |
| 24-Jul-2020 15:39 | Aerossurance | Updated [Nature] |
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