What happened
On August 25, 2003, an EMB-721D aircraft, registration PT-REH, departed from Cuiabá, Mato Grosso, for a flight to Cáceres under Visual Flight Rules (VFR). The mission involved transporting engineers to survey road areas. During the flight, the region was experiencing a stationary front with heavy precipitation, low ceilings, and strong winds.
As the aircraft approached the destination, witnesses observed the plane emerging from a cloud layer in an abnormal, nose-down attitude. During the descent, the aircraft suffered severe structural failure; the left wing, horizontal stabilizer, and vertical stabilizer detached from the fuselage. The aircraft impacted the ground in a nearly perpendicular, uncontrolled descent. All four occupants—the pilot and three passengers—perished in the accident.
The investigation
CENIPA investigators examined the wreckage and identified significant structural damage. Analysis of the left wing showed evidence of extreme vertical forces, specifically a negative G-load, which caused the wing to separate from the fuselage. The right wing also showed deformation consistent with internal collisions between aircraft components.
The investigation also reviewed the pilot's experience and the operational environment. While the pilot held a valid Commercial Pilot license, he had limited experience with this specific aircraft type and with instrument flight. Investigators also noted that the aircraft was registered for VFR operations only, yet was being operated in Instrument Flight Rules (IFR) conditions. Furthermore, evidence suggested the use of an unapproved, non-standard approach procedure commonly used by local pilots to land in low visibility.
Findings
- Adverse weather conditions including low ceilings and turbulence contributed to the aircraft entering an abnormal attitude.
- Structural failure occurred when the pilot's attempts to recover the aircraft from an abnormal attitude exceeded the structural load limits of the EMB-721D.
- Inadequate flight planning and judgment, as the flight proceeded under VFR even though meteorological reports indicated IFR conditions.
- Operational non-compliance, specifically operating an aircraft registered for VFR in IFR conditions and utilizing unapproved landing procedures.
- Pilot experience levels, specifically limited experience with the aircraft type and instrument flight, which may have hindered effective recovery from spatial disorientation.
- External pressure, as the pilot's personality traits and the presence of passengers may have influenced the decision to proceed despite the weather.