What happened
On 25 April 2004, an Extra EA 300, registration G-IIZI, was conducting a training flight at Kemble Airfield in Gloucestershire. The flight involved a trial lesson with the commander seated in the rear of the aircraft. The weather conditions were favorable, characterized by good visibility and light, variable winds.
During the landing phase on Runway 26, the commander performed a standard approach. As the aircraft slowed to approximately 20 knots, the pilot attempted to apply gentle, even braking to prepare for a right-hand exit from the runway. However, the pilot noted an immediate lack of resistance in the left brake pedal, causing the aircraft to veer sharply to the right. Despite attempts to regain directional control using full left rudder and left braking, the aircraft entered a ground loop. The impact caused the left landing gear to collapse, resulting in minor fuselage damage, abraded propeller tips, and engine shockloading.
The investigation
The AAIB examined the aircraft and the braking system following the incident. The investigation focused on the sudden loss of braking effectiveness on the left side of the aircraft. Upon inspection, the left brake assembly was found to have been significantly disrupted by the forces of the accident itself. No evidence of any mechanical defects or pre-existing issues within the braking system was found prior to the event.