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Subsequent airplane nose down stabilizer trim motion from 7.0 degress ANU to 2.0 degrees ANU was due to the use of primary trim. Stabilizer motion from 2.0 degrees ANU to 0.4 degrees AND was commanded by the autopilot. The horizontal stabilizer jammed at 0.4 degrees AND and remained jammed until the Acme nut threads failed.
A Boeing 737 uses an adjustable stabilizer, moved by a jackscrew, to provide the required pitch trim forces. Generic stabilizer illustrated. A horizontal stabilizer is used to maintain the aircraft in longitudinal balance, or trim: [3] it exerts a vertical force at a distance so the summation of pitch moments about the center of gravity is zero. [4]
The aircraft was a 2 year old Lockheed L-1011-385 Tristar (Serial number 193C-1077) and was delivered to Delta on 24 May 1974 (registered as N707DA), at the time of the accident, had 5,000 flight hours. The captain was 56 year old Jack McMahan, who had 23,000 flight hours, of which 2,000 were in the L-1011.
On many low-speed aircraft, a trim tab is present at the rear of the elevator, which the pilot can adjust to eliminate forces on the control column at the desired attitude and airspeed. [2] Supersonic aircraft usually have all-moving tailplanes ( stabilators ), because shock waves generated on the horizontal stabilizer greatly reduce the ...
The vertical stabilizer is the fixed vertical surface of the empennage. A vertical stabilizer or tail fin [1] [2] is the static part of the vertical tail of an aircraft. [1] The term is commonly applied to the assembly of both this fixed surface and one or more movable rudders hinged to it. Their role is to provide control, stability and trim ...
A yaw damper (sometimes referred to as a stability augmentation system [1]) is a system used to reduce (or damp) the undesirable tendencies of an aircraft to oscillate in a repetitive rolling and yawing motion, a phenomenon known as the Dutch roll.