What happened
On July 7, 2015, an Aero Boero AB-115, registration PP-GQY, was conducting a flight training mission consisting of touch-and-go maneuvers at Ribeirão Preto Aerodrome (SBRP) in São Paulo. The flight was operated by Aeroclube de Ribeirão Preto for private pilot training purposes, with an instructor and a student pilot on board.
During the fourth landing of the sequence, the student pilot reported a loss of directional control as the aircraft drifted to the left. The instructor took control of the aircraft and attempted to correct the deviation using differential braking and rudder inputs. While attempting to return to the runway centerline, the instructor released the pressure on the right-side brake. This action caused the aircraft to yaw sharply to the left, resulting in a 27 and a half degree ground turn. During this maneuver, the right wingtip struck the ground, causing light damage to the wingtip and the right aileron.
The investigation
The investigation examined the flight sequence and the mechanical state of the aircraft. The crew reported that the first three landings had been completed without any indications of tire or mechanical issues. Upon inspecting the aircraft following the incident, investigators found that the left tire had partially deflated, likely due to the tire slipping against the rim during the maneuvers.
All relevant documentation for the crew, including medical and technical certificates, was found to be valid. The aircraft's airworthiness certificate was also up to date, and the aircraft was within weight and balance limits. Meteorological conditions at the time of the occurrence were favorable for flight.
Findings
- The primary factor in the loss of control was the application of flight controls, specifically the release of the right-side brake while the aircraft was still deviating from the centerline.
- The aircraft sustained light damage to the right wingtip and aileron.
- Both occupants remained uninjured.