What happened
On the morning of 18 October 2021, a Robinson R44 Raven II helicopter, registration ZS-PWH, was conducting a private flight from Botlierskop Game Reserve in the Western Cape. The flight, which included the pilot and two passengers, was intended to be a short trip returning to the reserve. The weather conditions were clear with visual meteorological visibility.
While flying southwest toward the Boggomsbaai area, the pilot experienced a sudden loud bang accompanied by vibrations through the controls. Although engine instruments remained within normal operating limits, the pilot decided to perform a precautionary landing on a nearby beach. During the descent, the pilot executed an incorrect flare, which caused the main rotor blades to diverge. This movement resulted in the first main rotor blade striking the upper monocoque shell of the tail boom, causing damage to the structure, though the tailboom shaft remained undamaged.
The investigation
Following the incident, a post-landing inspection revealed blood stains on the lower section of the second main rotor blade near the tip, indicating a bird strike had occurred. The specific species of the bird could not be identified as no remains were found at the site.
An examination of the aircraft's maintenance history and the pilot's credentials confirmed that the helicopter was properly maintained and certified according to regulations. The pilot held a valid Private Pilot Licence with the appropriate type endorsement and was deemed fit for the flight. No outstanding maintenance issues were noted in the aircraft's flight records prior to the occurrence.
Findings
- The primary cause of the incident was a bird strike that produced a loud noise and vibration, necessitating a precautionary landing.
- A contributing factor was the pilot's improper flare technique during the landing maneuver, which led to the rotor blade making contact with the tail boom.