ASN Wikibase Occurrence # 151364
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Date: | Friday 11 March 1983 |
Time: | 14:52 |
Type: | Sikorsky S-61N-II |
Owner/operator: | British Airways Helicopters |
Registration: | G-ASNL |
MSN: | 61220 |
Year of manufacture: | 1963 |
Fatalities: | Fatalities: 0 / Occupants: 17 |
Aircraft damage: | Substantial |
Location: | North Sea, 77nm North East of Aberdeen -
United Kingdom
|
Phase: | En route |
Nature: | Offshore |
Departure airport: | Claymore platform |
Destination airport: | Aberdeen Airport (ABZ/EGPD) |
Investigating agency: | AIB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:Ditched into the North Sea 77 nautical miles North East of Aberdeen and sank after main rotor gearbox failure. All 17 persons on board (crew of 2 and 15 passengers) escaped unhurt, and were rescued. According to the following extract from the official AAIB report into the accident:
"SHORTLY AFTER DEPARTURE FROM AN OIL RIG THE CREW HEARD A LOUD BANG & EXPERIENCED VIBRATION FROM THE MAIN ROTOR TRANSMISSION. AT THE SAME TIME THE No.1 ENGINE WAS SEEN TO RUN DOWN & STOP. A DISTRESS CALL WAS TRANSMITTED & A CONTROLLED DITCHING WAS COMPLETED WITH THE HELICOPTER STABILIZED ON ITS EMERGENCY FLOTATION GEAR. HOWEVER, DURING DEPLOYMENT, BOTH LIFE RAFTS WERE PUNCTURED & RENDERED UNUSABLE BY SHARP PROJECTIONS ON THE HULL OF THE A/C. THE HELICOPTER WAS NOT DAMAGED IN THE ACCIDENT BUT LATER SANK AS A RESULT OF DAMAGE SUSTAINED DURING AN ATTEMPTED RECOVERY.
THE REPORT OF THE AAIB CONCLUDES THAT THE ACCIDENT WAS CAUSED BY FAILURE, IN FATIGUE, OF A SPUR GEAR IN THE MAIN ROTOR TRANSMISSION GEARBOX WHICH RESULTED IN A RUPTURE OF THE GEARBOX CASING & LOSS OF THE TRANSMISSION LUBRICATION OIL"
UK registration G-ASNL cancelled 31/10/1983 as "sold to United States of America". Wreckage recovered and was sold to Carson Helicopters as N4503E; rebuilt to S-61 Shortsky.
Accident investigation:
|
| |
Investigating agency: | AIB |
Report number: | |
Status: | Investigation completed |
Duration: | |
Download report: | Final report |
|
Sources:
1. AAIB:
https://assets.digital.cabinet-office.gov.uk/media/5422fd0840f0b6134200080d/Sikorsky_S61N_G-ASNL.pdf 2. CAA:
https://www.caa.co.uk/docs/HistoricalMaterial/G-ASNL.pdf 3.
https://www.helis.com/database/cn/21224/ 4.
http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=14442 Media:
British Airways helicopter Sikorsky S-61N, G-ASNL ditched in the North Sea, 77 nm North-east of Aberdeen on 11 March 1983
Revision history:
Date/time | Contributor | Updates |
21-Dec-2012 11:59 |
TB |
Added |
21-Dec-2012 12:04 |
TB |
Updated [Narrative] |
01-Jun-2013 17:24 |
Dr. John Smith |
Updated [Time, Source, Embed code, Narrative] |
01-Jun-2013 17:34 |
Dr. John Smith |
Updated [Embed code, Narrative] |
12-Jun-2013 16:27 |
TB |
Updated [Location, Source, Embed code, Narrative] |
14-Jun-2013 14:04 |
helis |
Updated [[Location, Source, Embed code, Narrative]] |
14-Jun-2013 18:04 |
harro |
Updated [Damage] |
16-Jul-2013 15:01 |
TB |
Updated [Location] |
26-Oct-2015 22:18 |
Dr.John Smith |
Updated [Time, Location, Source, Embed code, Narrative] |
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