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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 was a daily non-stop international passenger 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).
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]
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.
For aviators, proper recognition of aircraft attitude is most critical at night or in poor weather, when there is no visible horizon; in these conditions, aviators may determine aircraft attitude by reference to an attitude indicator. Spatial disorientation can occur in other situations where visibility is reduced, such as diving operations.
“If your nose is itchy, there could be a ‘blockage’ in the flow of this energy,” she says. “Alternatively, it could mean you're about to receive a download of creative flow.” 5.
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
Counter-intuitively, to correct an excessive deflection causing a dive the pilot first pushes the nose down further, before easing back to gently raise the nose again. [95] During this easing back period, the elevator deflection reduces or even reverses, its force on the jackscrew does likewise and the manual trim eases up.