What happened
On 9 August 2014, a CZAW SportCruiser, registration G-EWZZ, was performing a private flight from Strathaven to Bute Airstrip in Scotland. Shortly after departing from Runway 27, the pilot experienced a loss of engine power. While the aircraft initially maintained altitude, the pilot was unable to sustain a climb and attempted to return to the runway.
During the return attempt, the aircraft entered a high nose-up attitude, resulting in a loss of forward visibility. The aircraft subsequently struck the ground, inverted in a roadside ditch, and caught fire. The pilot sustained serious injuries, while the passenger suffered fatal burns.
The investigation
The AAIB examined the wreckage and analyzed video footage from witnesses. The investigation focused on the engine performance, the aircraft's weight and balance, and the presence of a Ballistic Parachute Recovery System (BPRS).
Investigators found that the aircraft was likely operating above its maximum takeoff weight of 600 kg due to unrecorded modifications, including an autopilot and a heavier variable pitch propeller. While the engine was still producing power at the moment of impact, the investigation could not definitively confirm a technical fault due to the extent of the fire damage. The investigation also noted that the BPRS had not been activated, but the rocket motor had likely 'cooked off' due to the post-crash fire.
Findings
- The aircraft was likely overweight due to unrecorded modifications and the installation of a heavier propeller and autopilot.
- The pilot's decision to return to the runway was influenced by the lack of lifejackets and the proximity of the sea.
- The aircraft's weight and balance were outside of approved limits.
- The BPRS warning placards were difficult to identify from a distance and were destroyed by the fire.
- The location of the rocket launcher presented a risk to first responders, as it was positioned near fuel components.