What happened
On November 8, 2020, an Airbus AS350B3 helicopter, registration TG-GEA, was conducting humanitarian relief operations in the department of Alta Verapaz, Guatemala. The aircraft was engaged in transporting supplies to areas affected by a recent hurricane. While performing a hover operation, the tail rotor made contact with tree branches.
Upon experiencing vibrations caused by the impact, the pilot initiated an emergency procedure, maneuvering the aircraft away from the immediate danger zone. The pilot successfully landed the helicopter on the crest of a nearby hill, preventing a more serious accident and ensuring the safety of the occupants. The crew and passenger evacuated the aircraft on their own without injury.
The investigation
The DGAC/UIA investigation focused on the circumstances surrounding the tail rotor impact. Investigators examined the aircraft's maintenance records, which confirmed that the helicopter was fully compliant with its maintenance program and airworthiness requirements. The investigation also reviewed the pilot's qualifications, finding that the pilot was properly licensed and medically fit for the mission.
Technical analysis of the tail rotor blades revealed damage consistent with an impact while the engine was producing power. The investigation also noted that while the flight was part of an authorized humanitarian mission, the specific maneuvers required for supply delivery in confined, disaster-stricken areas involve complex operations that are not common in standard flight profiles.
Findings
- The primary cause of the incident was the lack of visibility and information regarding the rear section of the fuselage and the area surrounding the tail rotor during a hover operation.
- The tail rotor blades sustained damage due to inadvertent contact with tree branches.
- The pilot successfully executed an emergency landing, avoiding any injuries to the two occupants.
- Meteorological conditions at the time of the accident were optimal for visual flight.