What happened
On October 5, 2007, at 19:10 UTC, an Aeromot AMT-100, registration PT-PMF, was performing a private takeoff from Hercílio Luz Airport (SBFL) in Florianópolis, Brazil. As the aircraft began its takeoff roll on runway 32, it encountered a strong crosswind gust. This sudden lateral force caused the aircraft to deviate from the runway centerline, leading to a nose-down pitch (piloning) that resulted in the propeller tip and spinner making contact with the runway surface. The pilot subsequently aborted the takeoff and managed to keep the aircraft within the runway limits. During the deceleration process, the nose gear broke upon impact with the ground. The aircraft sustained substantial damage to the propeller and light damage to the engine cowling and spinner, while the nose gear was also damaged.
The investigation
The investigation examined meteorological data and the pilot's decision-making process. The Air Traffic Control Tower at Florianópolis had informed the pilot of wind gusts reaching 25 knots. Subsequent METAR reports confirmed the presence of windshear and a crosswind component of approximately 20 degrees from the runway axis with 13 knots of intensity. The investigation also reviewed the aircraft's flight manual, which specifies that takeoff and landing maneuvers are demonstrated for crosswinds of up to 15 knots. Additionally, investigators looked into the pilot's recent maintenance actions, noting that the pilot had personally replaced a nose tire the previous day without being a qualified technician.
Findings
- The pilot was properly qualified and held valid medical and pilot certifications.
- The aircraft was airworthy and within weight and balance limits.
- The pilot elected to operate the aircraft in crosswind conditions exceeding the manufacturer's specified limits.
- The presence of windshear and significant crosswind gusts contributed to the loss of directional control.
- The pilot's decision-making and judgment were compromised by an inadequate assessment of the risks associated with the adverse weather.
- A pattern of non-compliance with operational and maintenance regulations was noted, specifically regarding the unauthorized tire replacement performed by the pilot.