National Transportation Safety Board investigator Ralph Hicks said surveillance footage showed the plane's rough arrival, which caused the landing gear to collapse.
Earnhardt was headed to a race at Bristol Motor Speedway at the time to work as an on-air analyst for NBC Sports.
In his statement, Earnhardt thanked his pilots, law enforcement, medical personnel and hospital staff for their quick response in the wake of the accident. "A big thank you to NASCAR for giving us and all the agencies that responded to Dale Jr.'s plane crash free tickets!"
Earnhardt Jr. launched a press release on Twitter, thanking his followers and others who've supported them with messages, telephone calls and prayers for the reason that crash.
"We had a great time with our first responder family at the BMS night race", the Carter County Tennessee Sheriff's Office wrote.
Earnhardt says he and his wife appreciate the privacy extended to them as they process what happened.
"A Cessna Citation rolled off the end of Runway 24 and caught fire after landing at Elizabethton Municipal Airport in Tennessee at 3:40 p.m. today", a Federal Aviation Administration statement read.
Earnhardt is scheduled to return to his broadcast duties Labor Day weekend at Darlington Raceway, and he is also scheduled compete in the Xfinity Series race that weekend.
At the time of the incident, Dale's sister, Kelley Earnhardt, assured fans that the entirety of Dale's family was "safe" and taken to the hospital for evaluation.