- Air Accidents Investigation Branch
- 13 October 2016
- Date of occurrence:
- 10 February 2016
- Aircraft category:
- General aviation - rotorcraft
- Report type:
- Bulletin - Correspondence investigation
- Aircraft type:
- Bell 206B Jet Ranger II
- 3 miles WNW of Wycombe Air Park, Buckinghamshire
Uncommanded loss in altitude resulting in autorotation and heavy landing, 3 miles WNW of Wycombe Air Park, Buckinghamshire, 10 February 2016.
Having departed Wycombe Air Park and in level flight, the helicopter suffered a rapid and uncommanded loss of altitude. The pilot, believing that there had been a loss of engine power, carried out an autorotation. The helicopter touched down with a high rate of descent which resulted in the failure of the tail boom and landing gear.
Data recorded by on-board systems showed that the engine operated normally throughout the event. A limited examination of the helicopter was unable to identify a defect within the engine or flying controls which might have caused the uncommanded loss of altitude.
Download glossary of abbreviations:
Published: 13 October 2016
Date of occurrence: 10 February 2016