The investigation into one of the worst-ever hot air balloon crashes moves into a new phase next month, with an investigative hearing by the National Transportation Safety Board (NTSB).

The pilot and all 15 passengers aboard a hot air balloon died on July 30 of this year when the aircraft crashed into a field after striking high voltage power lines near Lockhart, Texas.

The hearing is scheduled for Dec. 9, 2016, from 9 a.m. to 4 p.m., in the NTSB Board Room and Conference Center, 420 10th Street SW, Washington, D.C., 20594.

The preliminary report for the investigation is available at and information about the NTSB’s investigation of the accident is available at

The NTSB conducts public investigative hearings to gather sworn testimony from witnesses and to allow public observation of the investigative process.