Accident Eurocopter EC 225LP Super Puma Mk2+ G-CHCN, 22 Oct 2012
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ASN Wikibase Occurrence # 150315
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Time:15:30 LT
Type:Silhouette image of generic EC25 model; specific model in this crash may look slightly different    
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)
Location:32 nm SW of Sumburgh, Shetland Islands -   United Kingdom
Phase: En route
Departure airport:Aberdeen-Dyce Airport (ABZ/EGPD)
Destination airport: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.


Accident investigation:
Investigating agency: AAIB
Status: Investigation completed
Download report: Final report
Safety recommendations:

Safety recommendation 2012-034 issued by AAIB to EASA

Revision history:

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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