What happened
On 19 July 2013, a Cameron Z-275 balloon, registration G-VBFT, was involved in an accident near Lanark, South Lanarkshire. During the flight, the balloon encountered wind conditions that differed significantly from the initial meteorological forecasts provided to the pilot.
The investigation
Following the initial accident report, the pilot provided additional information to the AAIB regarding the meteorological conditions present during the flight. The pilot's original report had indicated that very light or calm winds were expected in the area. However, the investigation established that while winds were light near the surface, the balloon encountered winds of up to 18 kt at higher altitudes. These winds decreased to approximately 10 kt as the balloon descended toward the landing site.
Findings
- The presence of increased wind speeds at higher altitudes was a significant factor in the occurrence.
- The combination of these higher-level winds and the hilly terrain created unstable conditions during the flight.
- The pilot indicated that the flight would likely not have been attempted had the actual wind conditions at altitude been accurately forecast.