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ASN Wikibase Occurrence # 195226
Last updated: 13 April 2021
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Time:09:30 LT
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Airbus Helicopters H125 (AS 350B3e)
Owner/operator:Confidentia Aviation Ltd
Registration: G-MATH
C/n / msn: 8274
Fatalities:Fatalities: 1 / Occupants: 3
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Wycombe Air Park, Booker, Buckinghamshire -   United Kingdom
Phase: Landing
Departure airport:Wycombe Air Park, Booker (EGTB)
Destination airport:Wycombe Air Park, Booker (EGTB)
Investigating agency: AAIB
The accident occurred whilst the helicopter was engaged in hydraulic failure training. An instructor was in the left seat of the helicopter, a pilot under training in the right seat and another pilot under training, who was a passenger on this flight, was seated in the rear.

The right-seat pilot was performing a hydraulics-off approach, to finish in a run-on landing. The instructor became dissatisfied with the approach parameters and took control in the latter stages, performing a hydraulics-off go-around into a left-hand circuit, before lining up the helicopter on final approach for the pilot to make a second attempt. Once again, the instructor took control late in the approach and performed another go-around. On this occasion, the left turn onto the downwind was flown with a higher angle of bank (AOB). The instructor was unable to control the roll attitude and the helicopter rolled left, beyond 90 AOB, descended rapidly and struck the ground, coming to rest on its left side.

All three occupants were seriously injured. The right-seat pilot died some weeks later from injuries sustained in the accident.

No technical issues were identified and a definitive reason why the instructor was unable to roll the helicopter back to a level attitude could not be determined.

The investigation concluded that clearer instructions in the AS350 flight manual for hydraulics-off flight would help prevent similar accidents in future. In response to this accident, the helicopter manufacturer has taken safety actions including: amending the AS350 flight manual to limit the AOB to 30 during hydraulics-off flight and the inclusion of warnings not to conduct low speed manoeuvres with hydraulics off due to the danger of loss of control. It has also prepared a safety video describing how to perform hydraulics-off training.


5. (entry for Friday 5 May, 9.35am)
8. AAIB final report:

Accident investigation:
Investigating agency: AAIB
Status: Investigation completed
Duration: 1 year and 5 months
Download report: Final report



Revision history:

05-May-2017 11:32 Aerossurance Added
05-May-2017 11:34 Aerossurance Updated [Source, Embed code, Narrative]
05-May-2017 12:49 Anon. Updated [Registration, Source, Photo, ]
05-May-2017 12:51 harro Updated [Aircraft type, Registration, Cn, Operator, Source, Damage]
05-May-2017 12:53 harro Updated [Location]
05-May-2017 15:10 Dr.John Smith Updated [Aircraft type, Location, Phase, Nature, Destination airport, Source, Embed code, Narrative]
05-May-2017 15:21 Aerossurance Updated [Aircraft type, Location, Embed code, Narrative]
06-May-2017 08:56 Iceman 29 Updated [Embed code]
06-May-2017 19:16 Masen63 Updated [Source]
07-May-2017 15:00 Anon. Updated [Damage]
11-Oct-2018 14:06 Iceman 29 Updated [Nature, Departure airport, Source, Embed code, Narrative]
11-Oct-2018 18:45 Dr.John Smith Updated [Source, Embed code, Narrative]
11-Oct-2018 19:14 Aerossurance Updated [Time, Aircraft type, Total fatalities, Source, Narrative]
11-Oct-2018 19:24 Aerossurance Updated [Embed code, Narrative]
13-Oct-2018 19:44 harro Updated [Embed code, Accident report, ]

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