What happened
On 1 May 2024, at approximately 1635 UTC, an Exodus Deltaj jet 500 Stingray, registration G-CMMW, was involved in an accident shortly after departing St Michael’s Airfield in Lancashire. During the initial climb, the engine's foot throttle became stuck, leaving the engine running at a high RPM. In response to this malfunction, the pilot shut down the engine and began preparations to perform a return to the airfield.
While attempting to descend, the pilot executed a turn to lose altitude. This maneuver resulted in the aircraft being positioned further from the airfield than originally intended. As the aircraft approached the boundary fence, it encountered a wind gradient, which led to a stall. The aircraft subsequently struck the ground, resulting in significant damage to the airframe, which may be beyond economic repair. The pilot sustained one serious injury to his leg, though he noted that his safety equipment, including his helmet and upper torso restraint, likely prevented more severe trauma.
The investigation
The AAIB investigation was based on the aircraft accident report submitted by the pilot and subsequent inquiries. Investigators examined the sequence of events leading to the stall and the mechanical state of the engine and controls. The investigation focused on the pilot's decision-making during the descent and the environmental factors present at the time of the impact.
Findings
- The primary factor in the accident was the engine throttle jamming at high RPM, which necessitated the immediate engine shutdown.
- The pilot's attempt to reduce altitude through a turn placed the aircraft in a position that increased the distance from the landing site.
- The encounter with a wind gradient during the maneuver caused the aircraft to stall.
- The specific cause of the throttle restriction could not be definitively identified by investigators.