Event Overview
On November 25, 2024, at 19:30 UTC, an Agusta A109E helicopter, registration LV-CLC, operated by Agrupación Aeromodelista Pucará, departed from Club de Polo La Dolfina in Cañuelas, Buenos Aires Province, with a destination of Helipuerto de Helicópteros Marinos in Don Torcuato, Buenos Aires Province. During the en route phase, the pilot observed an intermittent "WARNING" alarm accompanied by a "PRESS OIL" indication. The indication later became steady. The crew declared an emergency and performed a landing in an unprepared field.
Post-Event Inspection and Maintenance
The following day, a visual inspection of the aircraft was conducted at the landing site. The main transmission oil pressure switch and transducer were checked, and the connectors were found to be correctly installed. No oil leaks were detected in the transmission area, and oil levels were at the maximum specified values. The aircraft was then flown in ferry configuration to an Aeronautical Repair Workshop (TAR).
Upon arrival at the workshop, during initial system power-up, the EDU 1 "XMSN OIL PRESS" indication was not observed on the instrument panel. After depowering the aircraft and disconnecting the connector associated with the oil pressure switch, dirt was found between the connector pins. The contacts were cleaned, and maintenance tasks were performed in accordance with the Maintenance Manual, paragraph 63-41-18 ("Oil Pressure Warning Circuit"). No further anomalies were noted.
Test Flights and Return to Service
Following the maintenance, two test flights were conducted, both of which were completed satisfactorily. The aircraft was subsequently returned to service with no further issues. No injuries were reported, and the aircraft sustained no damage.
Investigation Notes
The event was classified as an incident (SCF-PP: powerplant failure or malfunction) and investigated as a desk investigation by the Junta de Seguridad en el Transporte (JST). No probable cause was stated in the official report.