What happened
On 16 October 2003, a Robinson R2ly Beta, registration G-DELT, was involved in an accident at Coventry Airport during a training operation. The aircraft was being prepared for a dual training flight by a student pilot. Having completed the necessary pre-flight inspections and successfully started the engine, the student proceeded with the after-start checks.
As the instructor approached the aircraft, the helicopter suddenly yawed rapidly to the left, completing a full 360-degree turn before lifting off the ground. During this uncontrolled movement, the front of the left skid struck the surface, causing the aircraft to roll onto its side. The engine stopped shortly after the impact. The student pilot sustained no injuries.
The investigation
Investigators examined the aircraft's mechanical condition and found no evidence of technical failure. The student had successfully performed all checks up to the low rotor RPM warning horn test.
During the investigation, it was noted that the student's height required him to bend his legs significantly to maintain contact with the non-adjustable yaw pedals. The investigation considered that the student may have inadvertently applied left pedal input. Furthermore, because the flight school's checklist required the collective and cyclic frictions to be engaged during the RPM check, the student's ability to react to the sudden movement was likely compromised.
Findings
- The aircraft became light on its skids and airborne due to the potential application of left pedal input and the raising of the collective lever.
- Inadvertent application of left yaw pedal by the student pilot likely contributed to the sudden rotation.
- The engagement of the collective and cyclic frictions prevented the student from effectively correcting the aircraft's movement.
- The student's lack of experience and the element of surprise hindered an effective response to the unexpected movement.