![]() ![]() The leading edge devices may be extended by the standby hydraulic system. Alternatively, the trailing edge flaps may be extended and retracted electrically. Normally, these surfaces are extended and retracted by hydraulic system B. High lift for take-off and landing is provided by trailing edge flaps and leading edge flaps and slats (LE devices). On ground, flight spoilers and ground spoilers are used in combination to destroy lift. Aerodynamic braking is provided in flight by the flight spoilers operating as speedbrakes. The Surface Position Indicator (if installed), located on the Captain's instrument panel, or, on 737NG the system display on the lower Display Unit, displays deflection of the ailerons, rudder and elevators. During automatic flight, the autopilot trim controls the stabilizer position. The horizontal stabilizer may be positioned by electric trim, or manually through the trim wheels. The spoilers are hydraulically powered from system A (inboard) and B (outboard) and operate proportionally with aileron movement. The ailerons are assisted by flight spoilers for roll control. The rudder may be operated by the standby hydraulic system if system A and/or B pressure is not available. The ailerons and elevators may be operated manually if required. Hydraulic power is provided from hydraulic systems A and B either system can operate all primary flight controls. GENERAL The primary flight controls, ailerons, elevators and rudders, are hydraulically powered. 1 BOEING 737 SYSTEMS REVIEW FLIGHT CONTROLS 1. ![]()
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