What happened
On the afternoon of October 6, 2024, a Cessna 177RG, registration CX-PAF, departed from the Treinta y Tres airport (SUTR) for a planned flight to SUPC. Shortly after takeoff, once the landing gear had been retracted and the aircraft was configured for climb, the pilot experienced a significant loss of engine power.
In an attempt to return to the departure airfield, the pilot initiated a left turn toward the perpendicular runway. However, due to the low altitude, insufficient airspeed, and remaining power, a return to the airport was not possible. The pilot subsequently executed an emergency landing in an unprepared pasture field located approximately 1,550 meters northwest of SUTR. The aircraft, with its landing gear retracted, made contact with the undulating, soft terrain and slid for approximately 150 meters before coming to a stop. Both occupants, the pilot and a passenger, were uninjured and evacuated the aircraft through the right-side door after the left door became obstructed by vegetation.
The investigation
The CIAIA investigation focused on the mechanical failure that caused the power loss. Investigators examined the engine's induction system and found that the metal cover of the alternative air inlet had detached from its hinge. This detached component was found deformed and lodged within the airflow path of the induction system, effectively restricting the air supply to the engine.
While the pilot noted that this specific cover had detached during two previous occasions without causing engine issues, the investigation established that in this instance, the position of the component caused the critical reduction in power. The investigation also reviewed maintenance records, which were found to be complete and up to date.