What happened
On July 26, 2014, during the 29th ‘Meetjeslandse Balloonmeeting’ in Eeklo, Belgium, a Libert L3400 hot air balloon experienced a sudden deviation during its take-off sequence. While participating in a competition event, the balloon began its ascent from a football field. Instead of following the anticipated south-eastern flight path based on prevailing winds, the aircraft immediately drifted toward the east.
Within seconds of leaving the ground, the envelope collided with a 19.5-meter light pole located near the launch site. The impact with the light socket tore the envelope, leading to rapid deflation. Although the momentum of the ascent initially kept the assembly climbing, the loss of buoyancy caused the basket to drop. The pilot managed to secure the balloon by binding a drop line to the pole to prevent further instability. While there were no fatalities or physical injuries among the two occupants, the passenger suffered psychological shock.
The investigation
AAIU(Be) examined the launch conditions, meteorological data, and the physical state of the aircraft. The investigation confirmed that the Libert L3400 was airworthy and operating within its weight limits. Investigators reconstructed the flight path using video footage from the event, which revealed that the balloon's heading shifted approximately 60 degrees clockwise from the expected direction.
Analysis of the launch site showed that the basket was positioned only 20-25 meters from the light pole, placing the envelope's equator at the edge of the 15-meter safety margin required by Belgian regulations. The investigation also reviewed the meteorological reports, noting that while the general forecast was stable, local surface conditions were likely more complex.
Findings
- The primary cause of the accident was an unexpected change in wind direction, likely triggered by turbulence from surface obstacles such as trees and other inflated balloons.
- The balloon was positioned too close to the light pole, which left the pilot with insufficient margin to perform any recovery maneuvers once the deviation occurred.
- The collision with the light pole's socket directly caused the structural failure of the envelope.