Incident Overview
While cruising over the Atlantic Ocean at an altitude of 23,000 feet, the flight crew received a clearance to descend to 13,000 feet. The instructor pilot took control of the aircraft to demonstrate an emergency descent procedure. During the descent, the first officer student pilot believed the instructor pilot was disoriented and assisted in the recovery of the aircraft. The instructor pilot later stated that he had become disoriented and allowed the airplane to reach its red line, the maximum airspeed permitted.
Post-Landing Findings
After landing, a mechanic inspecting the aircraft discovered that the refueling door was missing. Additionally, damage was found on the horizontal stabilizer. No other damage or injuries were reported in the source.
Operations Context
The incident occurred during a training flight. The source does not specify the aircraft type, registration, engine count, date, operator, exact location, number of occupants, or weather conditions. No air traffic control involvement was mentioned.