It seems we are all speculating on what causes accidents in the North Sea, but not actually looking at a factual list. Below is a list drawn from the AAIB investigations, but not a definitive list. Apologies, but I am not computer literate enough to turn this into a neat table or formatted correctly, but I think it is readable!
Year - Reg - Type - Location - Cause - Fatalities - Day / Night - Details
1981 BIJF 212 Dunlin Human Yes Day Disorientation in poor weather
1981 ASWI Wessex Bacton Mechanical Yes Day Power Loss and failed Autorotation. Cause unknown
1981 BGXY S76 Peterhead Mechanical Yes Day Blade Spindle Failure
1982 BDIL 212 Murchison Area Unknown Yes Night No Firm Conclusion. Likely CFIT(W)
1983 TIGD 332 Aberdeen Mechanical No Day Tail Rotor Failure due to Drive Shaft Cover Failure
1984 BJJR 212 Humberside Unknown Yes Night Aircraft Crashed on approach at night. No conclusion provan
1986 BKFN 214 Aberdeen Mechanical No Day Failure of Collective Hub Nut -
1986 BWFC BV234 Sumburgh Mechanical Yes Day Gearbox Failure - Blades connected during fight (Chinook)
1988 BDES S61 Aberdeen Area Mechanical No Day Transmission Failure
1988 BEID S61 Sumburgh Area Mechanical No Day Gearbox Fire
1987 BHYB S76 Fulmar Human No Night CFIT(W) - Co-Pilot took control and established a climb but aircraft briefly hit water
1987 BKZH 332 Unst Mechanical No Day Tail Rotor Control Falure
1990 BEWL S61 Brent Spar Human Yes Day Collision with structure during landing
1992 TIGH 332 Cormorant Alpha Human Yes Night CFIT(W) - Aircraft crashed at night while shuttling between platforms
1993 BTCT 332 Gryphon Alpha Platform Mechanical No Day Double Engine Failure due to ingestion of snow
1994 BKJD 214 Petrojarl 1 Weather / Human No Night Vortex Ring State on Go-Around from Approach - Very Low Recovery - Possible Microburst
1995 TIGK 332 Brae Field Weather No Day Tail Rotor Failure due to Lightning Strike
1996 TIGT 332 Aberdeen Human No Night Rollover During Taxi
1997 BWZX 332 Soverign Explorer Weather No Day Lightning Strike
1998 BWMG 332 Sumburgh Area Mechanical No Day Rear Stabiliser Detatched from Aircraft during Flight
1998 ATBJ S61 Aberdeen Mechanical No Day Tail Rotor Control Failure on Landing
1999 BTEU 365 Loggs Platform Mechanical No Day Control Difficulty caused by Detatched Door Strut
2001 BKZE 332 West Navion External No Day Aircraft Rolled on Deck due to Excessive Vessel movement
2001 BMAL S76 North Denes Human No Day Inadvertant pulling of Collective instead of Parking Brake - Aircraft lifted then landed hard on tail
2001 TIGB 332 ESB Weather No Day Aircraft flew into waterspout. Tail rotor blades made contact with Tail Boom
2002 BJVX S76 Clipper Field Mechanical Yes Day Blade Failure - Main Rotor Blade Detatched from Head
2002 BMAL S76 Leman Field Human No Dusk Aircraft Struck Deck Edge on Approach to Platform
2002 SSSE S76 Trent Platform Human No Night Near Vortex Ring on Night Departure from Offshore - Co-Pilot Recovered Aircraft to climb from low altitude
2006 BLUN 365 Morcambe Bay Human Yes Night CFIT(W) - Aircraft crashed at night while shuttling between platforms
2007 CHCK S92 Aberdeen Mechanical No Day Vibration - Tail Rotor Blade Pivot Detached
2008 BKXD 365 Leman Field Human No Day Tail Boom Struck Crane During Approach
2009 REDU EC225 ETAP Platform Human No Night CFIT(W) - Aircraft crashed at night while approaching to land
2009 REDL 225 Peterhead Mechanical Yes Day Gearbox Failure
2010 IACC S92 Scatsta Human No Day Inadvertant pulling of Collective instead of Parking Brake - Aircraft lifted then landed hard
2012 REDW EC225 Aberdeen Area Mechanical No Day MGB Bevel Gear Failure
2012 CHCN EC225 Orkney Isles Mechanical No Day MGB Bevel Gear Failure
2013 WNSB 332L2 Sumburgh Yes Day Under Investigation