Grant Aviation Cessna 207A accident

The pilot was performing a short-field takeoff procedure with an airplane that was near its maximum gross weight. The airplane’s operating handbook specified that the short-field takeoff procedure required the use of flaps until the airplane had reached an indicated airspeed greater than 80 knots. The pilot reported that, during the initial climb, he felt the airplane sink and saw the wing flaps retract in his peripheral vision. The pilot pushed the airplane’s nose down to gain airspeed; however, the airplane was too low to gain sufficient airspeed for continued flight, and subsequently landed hard on the runway, resulting in substantial damage to the fuselage and empennage. Examination of the flap system revealed that the flaps were fully retracted at the time of impact, and the flap position lever was also in the retracted position. An operational check of the flap control system was conducted in accordance with the airplane service manual and no abnormalities were observed. Given the position of the flaps and flap position lever at the time of the accident and the lack of anomalies during postaccident operational testing of the flap system, it is likely that the pilot either retracted the wing flaps during the takeoff initial climb at an altitude and airspeed that was insufficient to sustain flight, or attempted a short-field takeoff with the flaps improperly configured (retracted), which resulted in an aerodynamic stall and subsequent hard landing.

Verbatim NTSB analysis and probable cause from the NTSB dataset