ASN Wikibase Occurrence # 195701
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| Date: | Saturday 27 May 2017 |
| Time: | 17:00 LT |
| Type: |  de Havilland DH110 Sea Vixen FAW2 |
| Owner/operator: | Naval Aviation Ltd Navy Wings Heritage Centre |
| Registration: | G-CVIX |
| MSN: | 10125 |
| Year of manufacture: | 1963 |
| Engine model: | Rolls-Royce Avon Mk 208 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | RNAS Yeovilton, Somerset -
 United Kingdom
|
| Phase: | Landing |
| Nature: | Demo/Airshow/Display |
| Departure airport: | RNAS Yeovilton (EGDY) |
| RNAS Yeovilton (EGDY) | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The Sea Vixen made a belly landing at Yeovilton. Nobody were injured. Damage appeared to be confined to the underwing tanks and the lower rear fuselage. The pilot jettisoned the canopy upon touchdown to facilitate egress.
According to a statement from Naval Aviation Ltd, the owner of G-CVIX (XP924): "Following the Sea Vixen’s successful display closing the show at Duxford Air Show, upon her return the Sea Vixen suffered hydraulic problems and the Pilot, Commander Simon Hargreaves, performed a highly controlled wheels up landing at RNAS Yeovilton. Pilot is safe and well. Post accident processes are currently being carried out. Unfortunately the aircraft will not be displaying at Duxford Air Show tomorrow."
The hydraulic failure which prevented the undercarriage lowering also meant the flaps could not be lowered, so touch down was at a higher speed. the impact left cracks in both of tail booms, a badly damaged gear box and warped bulk heads in her engine compartment with repairs estimated at >£2 million.
AAIB Report:
Analysis
It is not known exactly when either of the pump pistons seized. However, since the landing gear, flaps and airbrake appeared to be working during the flying display, it is likely the
hydraulic pump problem arose during the flight back to Yeovilton. Most of the Green hydraulic pump pistons had seized in their carrier bores whilst either in
their minimum stroke position or as they increased to their maximum stroke in response to demand. That demand was made on return to Yeovilton with the airbrake, as servo
pressure dropped and the servo linkage attempted to change the angle of the swashplate to increase the stroke of the pistons. However, with the pistons seizing, the piston heads
were caused to jam against the swashplate track and resist its rotation breaking, the quill drive. At this point the Green system hydraulic pressure fell to zero.
The aircraft appears to have sustained the loss of two hydraulic systems simultaneously, caused by failure of both the Red and the Green system hydraulic pumps. However, it is
possible that the design of the Red and Green systems meant the Red system had been in a failed condition in advance of the Green system but manifested itself in each system
simultaneously as demands were made. It is not known exactly when either of the systems failed but it is likely that the systems were operating correctly during the flypast when the
pilot demonstrated items with high hydraulic demand, such as the landing gear, flaps and arrester hook. The Yellow and Blue hydraulic systems appear to have been unaffected.
Conclusion
The failure mechanisms appeared identical in the Red and Green pumps with the seizure of the pistons caused by a yet unidentified source of contamination or debris in the hydraulic
fluid. The presence of microscopic silver particles suggests component wear within the system, but at the time of publication, a source or a component has not been identified.
The unexpected activation of a dormant heater circuit within the Red or Green system is of interest as a possible source of contamination. Work will continue to establish the cause of
the hydraulic pump piston seizure in this aircraft.
See complet AAIB report below.
Accident investigation:
 |
|
Sources:
1. VISUAL SIGHTING
2. https://siteapps.caa.co.uk/g-info/
3. Belly landing pictures : https://www.pistonheads.com/gassing/topic.asp?h=0&f=191&t=1675191
4. Landing video: https://www.youtube.com/watch?v=R5qEhY3XD6Q
5. http://www.dailymail.co.uk/news/article-4549964/Last-Sea-Vixen-plane-does-emergency-landing-show.html
6. https://forum.keypublishing.com/showthread.php?142443-Sea-Vixen-wheels-up-landing
7. https://www.navywings.org.uk/news-blog/sea-vixen-update-20th-june/
8. https://www.somersetlive.co.uk/news/somerset-news/watch-emergency-landing-yeovilton-sea-79119
9. https://www.royalnavy.mod.uk/news-and-latest-activity/news/2017/june/30/170630-white-knight-needed-to-save-navy-s-last-sea-vixen
AAIB report, march 2018 : https://assets.publishing.service.gov.uk/media/5a82eda1ed915d74e3404473/DH110_Sea_Vixen_FAW_Mk_2_G-CVIX_03-18.pdf
History of this aircraft
Other occurrences involving this aircraft
| 5 April 2012 | G-CVIX | Drilling Systems Ltd. | 0 | Bournemouth Airport, Parley Lane, Christchurch, Dorset | |
min |
Images:
YEOVILTON EGDY
G-CVIX on the runway prior to recovery (photo: AAIB)
Media:
Some pictures of the Sea Vixen's wheels up landing today pic.twitter.com/SZkm0iizgw
— Dan (@Intrepid_Sailor) May 27, 2017
Sea Vixen Performs Spectacular Gear-Up Emergency Landing at Yeovilton (not Duxford) https://t.co/QrUtBziy4Q pic.twitter.com/nlPFX8qFUv
— The Aviationist (@TheAviationist) May 27, 2017
‘White knight’ needed to save @RoyalNavy's last Sea Vixen fighter after emergency landing Read: https://t.co/Q4ImoJvsOk #navywingsuk #RNHF pic.twitter.com/s6O3DKPb4s
— Royal Navy (@RoyalNavy) June 30, 2017
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-May-2017 17:30 | FERRYAIR | Added |
| 27-May-2017 17:32 | harro | Updated [Aircraft type, Operator] |
| 27-May-2017 17:44 | Aerossurance | Updated [Time, Operator, Location, Narrative] |
| 27-May-2017 21:05 | Geno | Updated [Location, Departure airport, Destination airport, Source] |
| 28-May-2017 09:09 | Iceman 29 | Updated [Source, Narrative] |
| 28-May-2017 11:29 | Aerossurance | Updated [Embed code] |
| 28-May-2017 15:53 | Iceman 29 | Updated [Source, Embed code] |
| 28-May-2017 20:51 | Dr.John Smith | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 29-May-2017 09:26 | Aerossurance | Updated [Departure airport, Destination airport, Embed code, Narrative] |
| 29-May-2017 14:36 | Anon. | Updated [Total occupants, Embed code] |
| 30-Jun-2017 10:23 | Aerossurance | Updated [Source, Embed code, Damage, Narrative] |
| 08-Mar-2018 12:47 | Iceman 29 | Updated [Source, Embed code, Narrative] |
| 08-Mar-2018 20:22 | harro | Updated [Time] |
| 08-Mar-2018 20:23 | harro | Updated [Photo, ] |
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