Incident Overview
The pilot reported that during the back-taxiing procedure on the runway, he firmly pressed the left brake, which initiated an abrupt left turn. This action caused the airplane to begin a ground loop, during which the nose went down. The airplane continued to nose over and ultimately came to rest in an inverted position.
Sequence of Events
According to the pilot's account, the incident began as he was back-taxiing. After applying firm pressure to the left brake, the airplane turned sharply left and entered a ground loop. The nose dropped, and the airplane continued its rotation until it was fully inverted. The pilot stated that his attention was diverted from looking out the front of the airplane to looking out the side window to check for chuck holes on the runway. He was not aware that the tail was coming up until the airplane was already in the process of nosing over.
Pilot Report
The pilot reported that his focus on the side window for chuck holes caused him to miss the initial signs of the tail rising. He only realized the airplane was nosing over when it was already underway. No further details about the aircraft type, registration, or injuries were provided in the source.