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In addition to teaching techniques to recover from unusual attitudes, UPRT is intended to provide initial experience of g-forces that could be encountered in a commercial aeroplane, from approximately -1g to 2.5g, and to help a pilot gain angle-of-attack awareness.
China Airlines Flight 006 (call sign "Dynasty 006") was a daily non-stop flight from Taipei to Los Angeles International Airport.On February 19, 1985, the Boeing 747SP operating the flight was involved in an aircraft upset accident, following the failure of the No. 4 engine, while cruising at 41,000 ft (12,500 m).
Recovery – With appropriate control inputs, the yaw rotation is slowed or stopped and the aircraft nose attitude is lowered, thus decreasing the wing's angle of attack and breaking the stall. Airspeed increases quickly in a nose low attitude and the aircraft is no longer in a spin.
The U.S. NASA Aviation Safety Program [2] [3] defines upset prevention and upset recovery as to prevent loss-of-control accidents due to aircraft upset after inadvertently entering an extreme or abnormal flight attitude. A Boeing-compiled list determined that 2,051 people died in 22 accidents in the years 1998–2007 due to LOC accidents. [1]
The captain noticed the reduction in engine output, but he did not realize the source of the problem, so he started a rapid descent as a precaution. At that time, the airspeed was already near stall speed, and the autopilot had already compensated with a nose-up attitude (angle of attack, or AOA) of 5.8° in an effort to maintain a constant ...
A final approach over a downsloping terrain with a flat runway, or to an unusually wide runway may produce the visual illusion of being too low on final approach. The pilot may then pitch the aircraft's nose up to increase the altitude, which can result in a low-altitude stall or a missed approach. [13]: 2, 3
The aircraft was in an "unusual or uncontrolled rolling and pitching" state, and a stall occurred thereafter. After the aircraft had developed a stall and an abnormal attitude, the recovery maneuvering did not comply with the operating procedures and techniques for Recovery of Unusual Attitudes.
The nose then falls back to the horizontal, and the aircraft accelerates away in the original direction ; Kulbit; post-stall maneuver similar to Pugachev's Cobra, but going to 360° pitch angle, flying a "loop" Roll; Rotational motion around the longitudinal axis (the nose rotates around its center). Barrel roll; a combination of a loop and a ...