What happened
On 1 November 2007, a Luscombe 8E Silvaire Deluxe, registration G-BUKT, departed from Sleap Aerodrome in Shropshire for a private flight intended to follow the Welsh coast between Barmouth and Aberystwyth.
While flying toward Dolgellau, the aircraft encountered a strong updraft as it passed over a ridge at approximately 2,600 ft amsl. Immediately following this encounter, the engine's performance changed significantly; although the engine remained running, it failed to respond to throttle adjustments or the application of carburettor heat.
Prioritizing the search for a landing site over transmitting a distress call, the pilot attempted a forced landing. However, the aircraft was at an insufficient altitude for the chosen field, which was bordered by steep terrain to the right and woodland to the left. In an attempt to maneuver, the aircraft stalled and struck a tree. The impact caused extensive damage to the aircraft and resulted in a fuel leak, though the cabin remained intact. The pilot sustained minor injuries.
The investigation
The investigation examined the circumstances surrounding the engine failure and the subsequent flight maneuvers. Investigators noted that the pilot had performed all necessary pre-flight inspections, including fuel and oil checks, without issue. Eyewitnesses at the scene reported that the cloudbase was relatively low at the time of the accident, with scattered clouds present between 3,000 and 4,500 ft amsl.
Findings
- The loss of engine power was likely caused by carburettor icing.
- The environmental conditions, specifically the humidity levels typically found near the cloudbase, were conducive to such icing.
- The aircraft's stall and subsequent impact with a tree occurred during an attempt to turn away from steep terrain while at a low altitude.