Incident Overview
On July 26, 1999, at approximately 15:00 local time, a Cessna 172RG with registration CS-DAG landed on Runway 17 at the Municipal Airport of Torres Vedras in Santa Cruz, Portugal. The aircraft was owned and operated by Aeroplano, an aerial work company based at the same airfield. The flight was a local recreational VFR (Visual Flight Rules) sortie that had departed from the same location at 14:40 local time with one person on board.
Operational Context
During the approach, the pilot received radio information from the airport's Air Traffic Information Service indicating winds between 200 and 240 degrees at 12 to 15 knots. This wind direction was crosswind relative to Runway 17/35. The approved flight manual for the Cessna 172RG specifies a maximum demonstrated crosswind of 15 knots, meaning the conditions were near the operational limit.
Accident Sequence and Findings
The pilot landed with the landing gear retracted. According to the investigation, the pilot performed the approach and landing procedures from memory rather than using the required checklist. Due to distraction caused by the strong crosswind, the pilot failed to verify that the green lights indicating the gear was down and locked were illuminated and did not hear the warning horn for unblocked gear.
Damage and Investigation Results
The aircraft sustained minor damage to its belly, with no indications of rivet damage. All antennas mounted on the lower fuselage, including ADF Loop and Sense, Transponder, and DME units, were destroyed. The engine exhaust was slightly dented. No fire occurred, and the pilot exited the aircraft unharmed.
Post-accident tests conducted by DGAC investigators on the retractable landing gear system revealed no mechanical anomalies or malfunctions. The warning horn functioned correctly when tested. The investigation concluded that the accident was caused solely by human error, specifically the failure to use the checklist and verify gear status during a critical phase of flight under challenging wind conditions.