CEN21FA252

The flight instructor and student pilot were conducting a training flight. automatic dependent surveillance – broadcast (ADS-B) and onboard data revealed heading, engine power, and altitude changes consistent with maneuvering. Just before the accident, the airplane entered a power-off stall from an altitude of about 4,000 ft mean sea level (msl). The right wing dropped, the pitch attitude decreased, and the airplane entered a descent consistent with a spin. Ground scars and the orientation of the wreckage were consistent with an impact with terrain in a slight right-wing-low, nose-down attitude. The wreckage was highly fragmented with scattered debris that extended for about 75 yards. There were no mechanical malfunctions or anomalies that would have precluded normal operation of the airplane. Review of engine data indicated nominal engine performance before the accident. The airplane was not approved for spin maneuvers; however, the airplane’s flight manual provided a recovery procedure in the event of an unintentional spin. The circumstances of the accident are consistent with an inadvertent spin and loss of control while practicing an aerodynamic stall. Because the airplane was not approved for intentional spins, it is unlikely that the flight instructor had ever experienced a spin in the accident airplane make/model and was therefore likely unfamiliar with its spin and recovery characteristics.

On June 6, 2021, about 1020 eastern daylight time, a Diamond Aircraft DA 40 NG airplane, N853L, was destroyed when it was involved in an accident near Darlington, Indiana. The pilot and flight instructor were fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 141 instructional flight. A review of automatic dependent surveillance – broadcast (ADS-B) data revealed that the airplane departed and flew northwest about 4,000 ft mean sea level (msl). At the time of the accident, the flight was not in radio contact with air traffic control. A witness heard the airplane, looked up, and saw it in a “nose down, left spin” before it disappeared behind a tree line. He added that it sounded like the propeller was at a high rpm before impact. Ground scars and the orientation of the wreckage were consistent with an impact in a slight right-wing-low, nose-down attitude. The main wreckage was oriented on a heading of about 037°. The wreckage was highly fragmented with scattered debris that extended about 75 yards. All major components of the airplane were accounted for at the accident site. A slight odor of fuel was present, along with fuel blight on vegetation along the debris path. Control continuity was established for all flight controls; separations were consistent with overload or impact damage. A data card was removed from the flight display and the engine’s electronic engine control unit (EECU), which was damaged in the accident, was also secured for later examination. The EECU was shipped to the engine manufacturer for data download. The exam noted no preimpact abnormalities that would affect engine operation. The engine was running normally and appeared to respond to the power lever requests. A review of the airplane’s Garmin G1000 data revealed several turns and engine power and altitude changes, consistent with airplane maneuvering. The data revealed that the airplane was about 4,000 ft msl when engine power was reduced; as the airspeed decreased, the airplane’s pitch attitude increased. The airplane’s pitch then decreased to a nose-down attitude, and the airplane made a right, spiraling turn consistent with a stall and spin entry. The flight instructor was a graduate of the flight school’s training academy and had earned her flight certificate on March 30, 2021. She had about 329 total hours of flight experience and 44 hours as a flight instructor. The student pilot had about 16 total hours of flight experience. The airplane was not approved for spins. The aircraft flight manual noted the following procedure for recovery from an unintentional spin (see figure). Figure. Flight manual excerpt