What happened
On 17 July 2016, a DH82A Tiger Moth, registration G-AOHY, was performing a private flight from Wickenby Aerodrome in Lincolnshire. The aircraft, powered by a single De Havilland Gipsy Major MK 10-1 piston engine, began its takeoff roll from a grass strip located next to Runway 21.
During the takeoff sequence, the pilot noticed that the aircraft was failing to accelerate or gain altitude as expected. Although the aircraft briefly became airborne, it was unable to maintain flight and subsequently settled into a wheat crop located just past the intersection of Runway 16/34. The impact caused the aircraft to pitch over into an inverted position. There were no injuries to the pilot during the incident.
The investigation
The investigation was based on the aircraft accident report submitted by the pilot. Prior to the takeoff, the engine had started easily and magneto checks had been completed with normal results. The pilot noted that the aircraft's lack of performance was unexpected given the successful pre-flight checks.
During the event, the pilot considered several potential factors for the lack of performance. One possibility investigated was the occurrence of carburettor icing, as the engine had been running at idle power on the ground for approximately five minutes. Additionally, the pilot noted that a stiff throttle linkage might have prevented the application of full power during the takeoff roll. The pilot did not believe a primary mechanical failure was likely due to the successful engine start and magneto checks.
Findings
- The aircraft sustained damage to the propeller blades, wings, engine cowling, and empennage.
- Insufficient engine power prevented the aircraft from maintaining a safe climb gradient.
- Potential contributing factors included possible carburettor icing following prolonged ground idling or the failure to achieve full power due to a stiff throttle linkage.