What happened
On 8 August 2009, a Cameron Z-275 hot air balloon, registration G-CDIH, was conducting a local sightseeing flight departing from Ashton Court Estate near Bristol. During the conclusion of the flight, the pilot identified a sports field as a suitable landing location. However, as the aircraft approached the site, the wind conditions shifted, veering from a 260°/5 kt forecast to a 230° direction with increased strength, potentially reaching 12 kt.
Upon receiving communication from another pilot regarding a nearby golf putting green, the commander attempted to adjust the landing point to avoid property damage. The pilot climbed to 50 ft to select a new site approximately 300 m away. During this maneuver, the wind backed further toward 230°. To facilitate a steeper descent, the pilot utilized the parachute deflation system. This maneuver caused the balloon to drift into an area obscured by trees, where the basket struck a low pillar on a set of ornamental stone steps. The impact caused the basket to tip onto its side and drag through a low wall.
The investigation
The investigation examined the flight path, the changing wind conditions, and the physical damage to the aircraft and the site. Investigators noted that the pilot's view of the new landing area was partially obstructed by trees. The examination of the G-CDIH basket revealed scuffs, buckling, and a small hole caused by the stone pillar. One passenger, who was positioned against an unpadded section of the basket, sustained one minor injury consisting of back bruising that required overnight hospitalization.
Findings
- The landing site was chosen based on forecast winds, but the actual surface winds were stronger and from a different direction than anticipated.
- The pilot's decision to initiate a steep descent using the deflation system, combined with the wind shift, led to the balloon drifting into an area containing unforeseen obstacles.
- The wind veered and increased in strength, contributing to the loss of control over the precise landing position.
- The basket struck a stone pillar at a point where there was no padding to absorb the impact.