![]() ![]() These tabs are displaced in the same direction as the rudder movement, providing the same effect as a larger rudder. The rudders are equipped with anti-balance tabs. The rudder will be hydraulically held in the new position and the rudder pedals will be deflected. ![]() A change in rudder trim position will have the same effect as pilot movement on the rudder pedals. The rudder trim wheel on the control stand repositions a centering mechanism in the rudder power control units. However, if System A pressure is lost, the lower rudder can be powered by the Standby Hydraulic System. First hydraulic flight control system manual#The rudders have no provision for manual revision. Power for the upper rudder is supplied by hydraulic system B while power for the lower rudder is supplied by hydraulic system A. The Boeing 727 has two rudders.upper and lower. Caution should be used during the stabilizer's trim check so that the captain's and the first officer's trim switches are not applied in opposite directions. The leading edge of the stabilizer will always move opposite the desired movement of the nose. When pitch trim is applied, the leading edge of the stabilizer is rotated to a new position. The horizontal stabilizer may be operated by a main electric trim motor, an autopilot trim motor, or by manual control cable. The control wheels cause the elevators to move using System A and B hydraulic pressure. Pitch is controlled by the elevators and by the horizontal stabilizer. First hydraulic flight control system full#At Flaps 40, full travel is available.Īilerons go into "manual revision" with the loss of hydraulic pressure providing a direct cable link between the pilot's yoke and the inboard aileron tabs (also outboard aileron tabs if flaps are extended). At Flaps 5, approximately 80% of full outboard aileron travel is available. ![]() When the flaps are retracted, the outboard ailerons are faired. The maximum amount of outboard aileron deflection is determined by the position of outboard trailing edge flaps. As flaps are extended the slow-speed ailerons become operative, providing increased roll control at lower airspeeds. When the wing flaps are up, the outboard ailerons are locked in a faired position with the wing. Both inboard and outboard ailerons are fitted with balance tabs to reduce the required control pressures and assist primary flight control movement by relieving aerodynamic forces. Roll control on the 727 is provided primarily by inboard and outboard ailerons that are augmented by flight spoilers. ![]()
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