What happened
On September 1, 2018, a Beechcraft F33A, registration PT-OCB, was performing a flight from Carlos Prates Aerodrome (SBPR) to Serra do Cipó Aerodrome (SNLG) in Minas Gerais, Brazil. The flight was a private transfer involving a single pilot.
After departing, the aircraft followed all instructions from Belo Horizonte Approach Control (APP-BH) until it reached the vicinity of Taquaraçú. At this point, the aircraft's flight profile became erratic. Radar images indicated that the aircraft began oscillating in heading, altitude, and speed. Specifically, the aircraft performed a slow left turn with an increase in altitude and a reduction in speed, followed by a right turn that caused a significant increase in speed and a constant loss of altitude. The aircraft disappeared from radar at flight level 039 and subsequently collided with the terrain in a mountainous rural area near Taunaraçú de Minas. The impact was high-energy, resulting in the destruction of the aircraft and the fatal injuries of the pilot.
The investigation
CENIPA investigators examined the wreckage, radar data, and radio transcripts. Technical analysis of the engine and propeller revealed that the engine was operational and developing power at the moment of impact, as evidenced by deformations in the propeller blades. The aircraft was found to be within weight and balance limits, and the weather conditions were favorable for visual flight.
Investigators also reviewed the pilot's medical history. While the pilot held a valid medical certificate, records indicated a history of hypertension, dyslipidemia, and coronary artery disease. Clinical stratifications had previously placed the pilot in a high-risk category for an acute myocardial infarction.