The pilot of the banner tow airplane performed a normal takeoff and stayed in the airport traffic pattern for the banner pickup. The pilot described that after successfully capturing the pickup rope, he climbed with the engine at full power, the flaps retracted, and at a speed of about 45 to 50 mph. The airplane drifted left before the banner left the ground, and the pilot attempted to correct the flight path to the right. The airplane and banner subsequently climbed above the nearby trees, after which the pilot released the banner. The airplane then abruptly pitched up, the right wing “dropped,” and the airplane entered a 180-degree spin to the right that continued to ground impact. The pilot was seriously injured and the airplane was substantially damaged during the impact with trees and terrain. The operator reported, and a post accident examination by a Federal Aviation Administration inspector confirmed, that there were no preimpact mechanical malfunctions or failures of the airplane and its flight controls that would have precluded normal operation. The operator also reported that it was their company’s standard procedure to climb the airplane at a speed of 55 mph with the flaps extended 10 degrees in order to achieve best climb out. Additionally, when releasing a banner, the prescribed procedure included pushing forward on the control yoke to prevent an abrupt pitch up. Based on this information, it is likely that the pilot climbed at too low an airspeed during the banner pickup, resulting in a loss of control, his decision to release the banner, and the uncorrected pitch up of the airplane that ultimately resulted in the aerodynamic stall/spin.