ASN Wikibase Occurrence # 150980
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| Date: | Thursday 12 August 1993 |
| Time: | day |
| Type: |  Westland Wessex HC2 (S-58T) |
| Owner/operator: | 22 Sqn RAF |
| Registration: | XR524 |
| MSN: | WA/146 |
| Year of manufacture: | 1964 |
| Fatalities: | Fatalities: 3 / Occupants: 7 |
| Aircraft damage: | Destroyed |
| Location: | Llyn Padarn, Llanberis Gwynedd -
 United Kingdom
|
| Phase: | En route |
| Nature: | Military |
| Departure airport: | RAF Valley, Anglesey |
| Confidence Rating: |  Information is only available from news, social media or unofficial sources |
The SAR helicopter spiralled into lake after suffering a loss of tail rotor drive during a familiarisation flight with air cadets onboard. The three crew suffered 'major injuries', three of the passengers were fatally injured and one passenger suffered minor injuries.
When the tail pylon was unfolded the toothed coupling on the tail rotor drive never engaged correctly. Subsequent movement should have ensured that this occurred. Due to hardening of grease and possible spline wear this did not happen. During a simulated yaw channel runaway the high load disengaged the coupling. Tail rotor speed decayed which lightened the load and the coupling re-engaged. The subsequent load shock caused failure of the drive shaft
Sources:
http://www.ukserials.com/losses-1993.htm
http://www.ukserials.com/pdflosses/maas_19930812_xr524.pdf
http://news.bbc.co.uk/2/hi/uk_news/wales/3139345.stm
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Dec-2012 01:41 | TB | Added |
| 23-May-2013 15:23 | Dr. John Smith | Updated [Operator, Source, Embed code, Narrative] |
| 23-May-2013 15:27 | Dr. John Smith | Updated [Embed code, Narrative] |
| 07-Jun-2013 18:39 | Dr. John Smith | Updated [Operator, Embed code] |
| 12-Jun-2013 15:31 | TB | Updated [Operator, Source, Narrative] |
| 31-Oct-2018 15:28 | Aerossurance | Updated [Location, Embed code, Narrative] |
| 10-Nov-2021 06:04 | Aerossurance | Updated [Location] |
| 10-Nov-2021 06:09 | Aerossurance | Updated [Operator, Source, Narrative] |
| 11-Nov-2021 10:24 | Nepa | Updated [Operator, Operator] |
Corrections or additions? ... Edit this accident description
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