The Federal Aviation Administration says early indications are that the experimental airplane stalled or reached a speed and angle at which it lost its lift.
The crash Saturday afternoon killed the pilot, 60-year-old Randy Humble, of Moscow, Idaho.
Witnesses say the airplane’s engine revved and the pilot appeared to be trying to pull up just before it crashed near Viola, Idaho.
Humble and another pilot had been performing aerial tricks for the GOP fundraising event. Humble was also dropping rolls of toilet paper, but it’s not clear why.
The National Transportation Safety Board is investigating with the help of the FAA.