What happened
On January 4, 2008, a Cessna 337G, registration PT-JAY, was performing a flight from Campo de Marte (SBMT) to Jundiaí (SBJD). During the approach to runway 36, the pilot observed a glider parked near the threshold of runway 18 and decided to perform a go-around.
To execute a shorter traffic pattern for runway 18, the pilot performed a climbing left turn. While focused on maintaining visual contact with the runway threshold, the pilot attempted to reduce power for the descent but inadvertently moved the fuel selectors to the shut-off position, causing an involuntary engine shutdown.
Because the aircraft's battery was deficient, the pilot was unable to restart the engines. Unable to reach the runway, the pilot attempted an emergency landing on the side of the Rodovia dos Bandeirantes. During the final approach, the aircraft struck low-voltage power lines. The impact with a cable caused the aircraft to rotate and capsize onto its back, resulting in severe damage to the airframe. The pilot sustained minor injuries.
The investigation
CENIPA's investigation focused on the sequence of events leading to the engine failure and the subsequent impact with the electrical grid. Investigators examined the pilot's flight maneuvers, noting that the climbing turn used to reposition for the runway was not in accordance with the established Visual Approach Chart (VAC) for the aerodrome.
The investigation also reviewed the aircraft's technical status, finding that while the airworthiness certificate and maintenance logs were up to date, the battery was unable to support an engine restart. Furthermore, the investigation noted a discrepancy in the pilot's qualifications, as the pilot held a single-engine rating but was operating a multi-engine aircraft.