What happened
On 16 April 2006, a Lindstrand LBL 210A hot air balloon, registration G-BZDE, was conducting a scheduled evening pleasure flight near Bordon, Hampshire. The flight, carrying one pilot and 10 passengers, had been searching for a suitable landing site for some time after several previous attempts had been abandoned.
As the flight progressed, the pilot identified two potential fields for landing. While the pilot initially intended to land in the first field, a late decision was made to target a second, larger field to allow for better access for the ground crew. During this maneuver, the balloon's track drifted toward a wooded area. To avoid a large tree on the edge of the field, the pilot initiated a climb. Shortly after striking the tree, the pilot realized that the balloon's path would lead to contact with high-voltage power lines. To mitigate the risk of the basket hitting the wires, the pilot utilized the rapid deflation system to force a descent.
During this descent, the balloon envelope made contact with 132 kV power lines. The impact caused a visible flash and a loud bang, triggering electrical protection circuits that temporarily disrupted power to approximately 62,500 customers. The basket landed upright on the ground, and despite the impact, there were no injuries to the crew or passengers.
The investigation
The AAIB examined the aircraft, the site of the accident, and the meteorological conditions. Investigators reviewed GPS data, which revealed that the balloon's track changed toward the tree approximately three minutes before the collision. The investigation also looked into the damage sustained by the balloon, noting that the envelope's crown ring and various fabric panels showed evidence of heat and conduction damage from the electrical contact. Technical staff from the electricity distribution company confirmed that while the power lines remained intact, the contact caused significant electrical surges.
Findings
- The pilot's decision to change the landing target at a late stage reduced the available space to maneuver safely around obstacles.
- The pilot's attempt to climb to avoid a tree resulted in a flight path that made contact with the power lines unavoidable.
- The use of the rapid deflation system while airborne, although prohibited by the manufacturer's manual, likely prevented the basket or its metal support wires from striking the live power lines.
- The balloon was operating with reduced groundspeed and low altitude, making it difficult to accurately judge distances and clearances from hazards.