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Adverse yaw is a secondary effect of the inclination of the lift vectors on the wing due to its rolling velocity and of the application of the ailerons. [2]: 327 Some pilot training manuals focus mainly on the additional drag caused by the downward-deflected aileron [3] [4] and make only brief [5] or indirect [6] mentions of roll effects.
The asymmetric lift causes asymmetric drag, which causes the aircraft to yaw adversely. To correct the yaw, the pilot uses the rudder to perform a coordinated turn. In a multi-engined aircraft, the loss of thrust in one engine can also cause adverse yaw, and here again the rudder is used to regain coordinated flight.
About six seconds after going around and 4,000 feet (1,200 m) from the runway threshold, as the aircraft climbed through 300 to 400 feet (91 to 122 m) and the airspeed increased, aerodynamic forces caused the left thrust reverser to deploy, causing the plane to yaw hard to the left, making the plane very difficult to fly and the airspeed ...
Soon, the transponder became inoperative. Once they were on final approach, with the airplane properly configured with flaps, the yaw damper was disengaged as a fatal result of critical mistakes during the execution of procedures. Henceforth, this made control of the plane hard at low speeds.
[4] [5] The plane suffered substantial structural damage with the No.7 leading-edge slat and a flight spoiler having detached, the right outboard aileron hinge fitting broke due to metal fatigue resulting in free-play, and the System A hydraulics ruptured due to the right main gear overextending which also broke the sidebrace and actuator ...
Spoiler controls can be used for roll control (outboard or mid-span spoilers) or descent control (inboard spoilers). Some aircraft use spoilers in combination with or in lieu of ailerons for roll control, primarily to reduce adverse yaw when rudder input is limited by higher speeds.
On June 28, 1998, United Airlines Flight 863, a Boeing 747-400 flying United's regularly scheduled transpacific service from San Francisco International Airport to Sydney Airport was forced to shut down one of its right-wing engines and nearly collided with San Bruno Mountain while recovering from the engine failure.
However, in the beginning of a turn, when the ailerons are being applied in order to bank the airplane, the ailerons also cause an adverse yaw of the airplane. For example, if the airplane is rolling clockwise (from the pilot point of view), the airplane yaws to the left. It assumes a crab-like attitude relative to the wind.