- Air Accidents Investigation Branch
- 10 September 2015
- Date of occurrence:
- 4 June 2015
- Aircraft category:
- Sport aviation and balloons
- Report type:
- Bulletin - Correspondence investigation
- Aircraft type:
- Kolb Twinstar Mk III Xtra
- Swinefleet Common, Swinefleet, Yorkshire
Loss of propeller in flight, Swinefleet common, 4 June 2015.
The propeller separated from the engine in flight, without warning and damaged the tail boom. The pilot was able to carry out an emergency landing without incident. The propeller was not recovered, but photographs taken of the fracture faces of the propeller retaining bolt shanks, which had remained attached to the engine crankshaft, showed clear evidence of failure due to the presence of high cycle fatigue. As a result if this incident, and two similar events , the Light Aircraft Association (LAA) have confirmed that they are in discussion with the engine manufacturer regarding the issue. Additionally details of the event, together with the recommended procedures for propeller attachment, have been published in the July edition of the LAA’s engineering “Safety Spot”.
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Published: 10 September 2015
Date of occurrence: 4 June 2015