Accident Overview
An aircraft engaged in a banner towing mission was flying at low altitude near California State Freeway 91. According to witnesses, the banner collided with power lines after the aircraft had crossed over the lines at a relatively slow speed.
Sequence of Events
The banner and tow cable or rope released from the aircraft following the collision, and the banner came to rest on the power lines. Witnesses reported that when the banner hit the power lines, the aircraft's forward movement appeared to stop. Subsequently, the aircraft dropped off to its left and descended into the path of an oncoming tractor-trailer truck.
Impact and Aftermath
The aircraft had nearly recovered from the descent when it impacted the freeway. The driver of the tractor-trailer and his wife exited the left side of the vehicle without injury. However, their son, who exited the right side during the evacuation, received minor injuries. Both the aircraft and the tractor were destroyed by impact and fire.
Investigation Findings
There was no evidence of a mechanical malfunction with the aircraft or towing equipment prior to the collision with the power lines.