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AILERON AND FLAPERON CONTROL -AILERON AND FLAPERON PCU -PCU MODES
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AILERON AND FLAPERON CONTROL -AILERON SURFACES
Purpose
The ailerons have two purposes. The ailerons supply low speed roll control of the airplane. The flaperons and the flight spoilers help this function. Ailerons also move down (droop) to supplement the high lift system.
Physical Description
The ailerons are light weight composite materials structures. The skin is reinforced graphite/epoxy bonded to a core of Nomex honeycomb. The overall dimensions are approximately 27 in by 259 in (0.7 m x 6.6 m). Each aileron weighs 165 lb (75 kg).
Two adjustable tungsten balance weights prevent flutter if hydraulic power is lost. The aileron attaches to the outboard rear spar with 6 hinges. Jumpers and static dischargers supply electrostatic protection to airplane systems.
Functional Description
The aileron surface deflection limits are at the PCU internal stops. The ailerons have a maximum movement of 33 degrees trailing edge up (TEU) and 19 degrees trailing edge down (TED) for conditions without loads. You measure the aileron movement in relation to the wing fixed trailing edge.
When there are loads, the maximum PFC and ACE command signals move the ailerons to a nominal position of 30 degrees TEU and 15 degrees TED. Aileron trim authority is 30 degrees of control wheel rotation. You adjust the aileron PCUs on the ground so the aileron control surfaces are about 2 degrees below the wing fixed trailing edge.
Training Information Point
Two hoist attach points are on the upper surface of the aileron front spar for aileron removal and installation.
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AILERON AND FLAPERON CONTROL -AILERON SURFACES
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AILERON AND FLAPERON CONTROL -FLAPERON SURFACES
Purpose
The flaperons have a dual purpose on the 777 airplane. First, flaperons supply roll control of the airplane, assisted by the ailerons and the flight spoilers. Second, flaperons move down (droop) to help the high lift system during takeoff, approach, and landing.
Physical Description
The flaperons are light weight composite materials structures. The skin is carbon fiber reinforced plastic bonded to a core of Nomex honeycomb. The overall dimensions are approximately 62 in by 95 in (1.6 m x 2.4 m). Each flaperon weighs about 110 lb (50 kg).
The flaperon attaches to the airplane structure with 2 hinges. An aluminum strip diverts lightning strikes on the flaperon trailing edge.
A cove lip door at the leading edge of the flaperon supplies a gap when the flaperon is full down to make aerodynamic performance better. The cove lip door attaches to the airplane structure and to the flaperon with two main hinge fittings.
Functional Description
When the flaperon moves down, a mechanical linkage pulls the drive link attachment point of the fitting aft. This rotates the cove lip door up, which supplies a gap along the leading edge of the flaperon.
The flaperon surface deflection limits are at the PCU internal stops. The flaperons have a maximum movement of 11 degrees trailing edge up (TEU) and 37 degrees trailing edge down (TED) for conditions without loads. When there are loads, the maximum PFC and ACE command signals move the flaperons to a nominal position of 10 degrees TEU and 30 degrees TED.
Training Information Point
The flaperon PCU attachment fittings supply lifting points for the flaperons.
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AILERON AND FLAPERON CONTROL -FLAPERON SURFACES
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AILERON AND FLAPERON CONTROL -FUNCTIONAL DESCRIPTION
General
The roll control system for the ailerons and flaperons uses input command signals from the wheel position transducers and the force transducer.
The ACEs receive the input signals and transmit them to the PFCs. The ACEs supply output command signals to the PCUs of the ailerons and the flaperons.
Wheel Position Transducers
The C ACE and R ACE each receive signals from two wheel position transducers. The L1 ACE and L2 ACE each receive signals from one wheel position transducer. After they change the signals to digital format, the ACEs send these signals to the PFCs. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 飞行操纵 Flight Controls 1(40)
