What happened
On February 27, 2018, a Beechcraft V3-35B, registration PT-IEL, was conducting a private flight from Presidente Prudente (SBDN) to Coxim (SSCI). After traveling approximately 110 nautical miles, the aircraft entered a region of heavy precipitation and towering cumulus clouds west of Brasilândia, Mato Grosso do Sul.
Following a series of turns within the rainy area, the aircraft lost control and entered a flat spin. The aircraft struck the ground at a shallow pitch and subsequently caught fire, resulting in the total destruction of the airframe. The pilot sustained fatal injuries.
The investigation
CENIPA investigators examined meteorological data, including satellite imagery and radar, which confirmed the presence of a high-humidity corridor and significant convective activity (TCU) along the flight path. The investigation analyzed the aircraft's wreckage, noting that the engine was still producing power at the moment of impact due to a crankshaft failure caused by the sudden stop.
Investigators also reviewed the pilot's flight experience and psychological state. While the pilot held a valid medical certificate and a private pilot license, they were not qualified for instrument flight rules (IFR). Evidence suggested the pilot was operating under Visual Flight Rules (VFR) despite the high probability of encountering Instrument Meteorological Conditions (IMC).
Findings
- Spatial disorientation likely occurred as the pilot performed successive turns within a rainy region, leading to a loss of control.
- The pilot's decision-making process was compromised by a combination of high motivation to reach a destination and self-imposed pressure to fulfill scheduled appointments.
- A complacent attitude toward safety procedures and a low level of situational awareness regarding the risks of VFR flight in deteriorating weather contributed to the accident.
- The presence of heavy rain and convective clouds created conditions that were unsuitable for the pilot's qualification level.