What happened
On February 19, 2015, a Cessna 182P, registration PT-KBV, departed from Parati, RJ, bound for Ribeirão Preto, SP. The flight was being conducted under Visual Flight Rules (VFR) with one pilot and three passengers on board. During the cruise phase at flight level 085, the aircraft entered an area of significant atmospheric instability characterized by convective activity and cloud development.
Witnesses observed the aircraft in a descending, spiral trajectory, noting that parts of the airframe were separating in flight before the aircraft struck the ground in a rural area of Bueno Brand/Brandão, MG. The impact occurred at a high speed and steep angle, resulting in the total destruction of the aircraft and the four fatalities of all occupants.
The investigation
CENIPA investigators examined the wreckage and determined that the impact was the primary cause of the damage to the propellers and much of the debris field. However, analysis of fractures in the fuselage sections indicated that the airframe had undergone aerodynamic overstress prior to the impact.
The investigation established that the pilot was a private pilot with approximately 77 total flight hours and 26 hours in this specific model, but lacked an instrument rating (IFR). While the aircraft's airworthiness certificate was valid, the maintenance logs for the engine and airframe were found to be outdated. Meteorological data confirmed that while conditions were favorable at departure, the flight path encountered significant convective clouds and vertical development starting at 2,000ft, which the pilot chose to fly through despite warnings from another aircraft in the vicinity.
Findings
- Flight Discipline: The pilot intentionally exceeded the minimum VFR visibility limits established by regulation, continuing to fly at FL085 even as weather conditions degraded to the point of making VFR flight impossible.
- Adverse Meteorological Conditions: The presence of significant convective activity and potential for large vertical cloud development (CB/TCU) increased the difficulty of maintaining aircraft control.
- Pilot Judgment: The pilot failed to properly assess the risks of flying in marginal visibility and did not take corrective action, such as climbing to a safer altitude, despite suggestions from another pilot in the area.
- Spatial Disorientation: The transition into conditions without external visual references likely led to spatial disorientation, which, combined with ineffective control inputs, resulted in the loss of control.
- Structural Failure: The aircraft experienced structural separation due to aerodynamic overstress during the loss-of-control event.