What happened
On September 1, 2016, a Eurocopter EC130B4 helicopter, registration TG-MCN, was conducting a private flight near the municipality of San Andrés, Petén. Upon reaching the intended landing site, the pilot decided not to land and instead opted to perform a low-altitude flyover along the shoreline of Lake Petén Itzá. During this maneuver, the pilot did not communicate these intentions to the Mundo Maya Air Traffic Control center. While executing a turn at a very low altitude, one of the main rotor blades struck the surface of the water, leading to an immediate loss of control and the subsequent sinking of the aircraft.
The investigation
The DGAC/UIA investigation focused on the flight sequence, aircraft condition, and pilot actions. Investigators examined the wreckage, which showed partial destruction due to the water impact, and inspected the engine and airframe in a hangar. The investigation confirmed that the aircraft was airworthy, with all required documentation, including the certificate of airworthiness and insurance, being valid at the time of the accident. Maintenance records showed the last major inspection had been completed earlier in 2016. The investigation also noted that the aircraft's systems were functioning normally prior to the impact, ruling out mechanical failure as a cause.
Findings
- The primary cause of the accident was the execution of a maneuver at a low altitude that resulted in the main rotor blades making contact with the water.
- The pilot performed the low-altitude flight without notifying Air Traffic Control of the change in intentions.
- Meteorological conditions were favorable, with unlimited visibility and calm winds.
- The pilot sustained minor injuries and experienced a momentary loss of consciousness but was rescued from the water by bystanders near the impact site.