What happened
On 20 September 2008, an X’Air 700(1A), registered G-CBCM, was conducting a private flight when the pilot noticed an unexpected change in the engine's sound during the initial climb phase. Following a normal takeoff, the pilot identified a suitable field ahead and decided to execute a precautionary landing. The aircraft touched down at a low speed, but during the landing, the left main landing gear wheel rolled into soft ground. The incident resulted in no fatalities and no injuries to the crew or the single passenger on board.
The investigation
An inspection of the aircraft following the landing revealed that the stub axle of the left main landing gear had cracked. The investigation focused on the engine performance issues reported by the pilot. Through discussions with the engine manufacturer’s agent, it was determined that the engine problem was a result of vapour lock. To rectify this, the fuel line was re-routed to the left side of the engine, ensuring it ran behind the carburettor rather than in front of it. Following an inspection by a BMAA Inspector, the aircraft was returned to service.
Findings
- The engine power fluctuation was caused by vapour lock within the fuel system.
- The landing gear damage was a result of the aircraft's wheel encountering soft ground during the landing sequence.