Incident Details
A witness reported observing an airplane begin to spiral or corkscrew. The rate of descent was slow, and the rotation speed was not fast. The airplane made approximately eight full rotations before descending out of view. At no time was there any indication of the pilot attempting to recover from the rotation. The witness further noted that there were no erratic or abrupt movements prior to the entry into the spiral; it appeared as if the pilot intentionally entered the maneuver. The airplane was about 1 to 1.5 miles west of the witness's location at an altitude of approximately 900 feet when it entered the spiral.
Examination
Investigators confirmed that flight control continuity was established, meaning the control systems were intact and connected.
Further Information
The source did not provide details such as the aircraft type, registration, operator, date, or any information regarding injuries or damage. The witness account remains the primary factual basis for this description of the event.