What happened
On 17 April 2010, a Flight Design CT2K, registration G-IDSL, was prepared for a solo flight from Frensham Airstrip in Surrey. During the takeoff roll from Runway 07, the pilot noted that the aircraft required significantly more right rudder than usual to counteract a leftward yaw. Despite applying what was believed to be full right rudder, the aircraft continued to yaw to the left. The pilot subsequently flew a wide left-hand circuit at 60 kt.
During the landing phase, the pilot attempted two landings. The first landing resulted in the aircraft drifting toward soft ground adjacent to the runway, prompting a rejected landing. For the second attempt, the pilot utilized an offset heading and a reduced approach speed of stall speed plus 5 kt. While the pilot managed to stop the aircraft on the runway, the touchdown was firm. The pilot sustained no injuries.
The investigation
An inspection of the aircraft revealed damage to the engine frame, the nose leg, the rudder pedal limit stop, and the right rudder pedal tube. The investigation established that the rudder pedal limit stop and centering mechanism had been compromised, restricting the travel of the right rudder pedal.
Investigators also examined the aircraft's recent ground handling. It was discovered that the aircraft had been moved using a mechanical tug. To facilitate this, the pilot had previously replaced standard fairing attachment bolts with larger-headed bolts to allow for easier tug connection. The UK type certificate holder stated that they do not approve or provide for the use of mechanical towing aids for this aircraft type.
Findings
- The damage to the rudder pedal limit stop and centering mechanism was likely caused by the use of the mechanical tug during ground maneuvers.
- The distortion of the right rudder pedal tube likely occurred during the flight when the pilot applied heavy rudder input to correct the yaw.
- The damage to the nosewheel strut, engine mounts, and nose leg was consistent with the force of the firm landing.
- The use of an unapproved mechanical towing aid led to the modification of the nosewheel fairing bolts, which contributed to the mechanical interference with the rudder controls.