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THE CONSTRUCTUREOF PRIMARY

FLIGHT CONTROL SURFACE BOEING

7771.AILERON

2.FLAPERONS

3.SPEEDBRAKES

4.ELEVATOR

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AILERON

The control wheel (also known as control stick or yoke)is connected to the ailerons by cables, bellcranks,pulleys and/or push-pull tubes. It is used to controlaircraft rolling movement.

hen the control wheel is turned! the aileron on onewing de"ects upward, while the aileron on the otherwing goes down. This increases and decreases lift onthe wings. Increased lift on the left wing and thedecreased lift on the right wing cause the airplane toroll to the right. Increased lift on the right wing andthe decreased lift on the left wing cause the airplane toroll the left.

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FLAPERON

•

A flaperon is a type of aircraft control surface that combines aspects ofboth flaps and ailerons . In addition to controlling the roll or bank of an aircraft, as do

conventional ailerons, both flaperons can be lowered together to function similarly to a

dedicated set of flaps. Both ailerons could also be raised, which would give spoilerons .

• The pilot has separate controls for ailerons and flaps. A mixer is used to combine the

separate pilot input into this single set of control surfaces called flaperons. The use of

flaperons instead of separate ailerons and flaps can reduce the weight of an aircraft. The

complexity is transferred from having a double set of control surfaces (flaps and ailerons to

the mixer.

• !any designs that incorporate flaperons mount the control surfaces away from the wing to

provide undisturbed airflow at high angles of attack or low airspeeds.

http://en.wikipedia.org/wiki/Flight_control_surfaceshttp://en.wikipedia.org/wiki/Flap_(aircraft)http://en.wikipedia.org/wiki/Aileronhttp://en.wikipedia.org/wiki/Flight_controlshttp://en.wikipedia.org/wiki/Spoileronhttp://en.wikipedia.org/wiki/Flap_(aircraft)http://en.wikipedia.org/wiki/Aileronhttp://en.wikipedia.org/wiki/Flight_controlshttp://en.wikipedia.org/wiki/Spoileronhttp://en.wikipedia.org/wiki/Flight_control_surfaces

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• "laperons are a specialised type of aircraft flight control surface that combine aspects of

both flaps and ailerons . "laperons respond to roll commands, made by the pilot via the control wheelin the same manner as conventional ailerons. #owever, the flaperons can also be symmetricallylowered to function similarly to a dedicated set of flaps. $ilot controls for lowering or raising theflaperons are separate from those controlling the aileron function. A mixer is incorporated in the designto combine the two pilot inputs appropriately

http://www.skybrary.aero/index.php/Flight_Controlshttp://www.skybrary.aero/index.php/Flapshttp://www.skybrary.aero/index.php/Aileronshttp://www.skybrary.aero/index.php/Flight_Controlshttp://www.skybrary.aero/index.php/Flapshttp://www.skybrary.aero/index.php/Ailerons

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RUDDER PEDAL

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#oving the left or right rudder pedal controls the rudder. hen therudder is de"ected into the air"ow, a hori$ontal force is e%erted inthe opposite direction. &y pushing the left pedal, the rudder movesleft and creates a sideward lift that moves the tail to the right andyaws the nose of the airplane to the left. 'imilarly when the rightpedal is pushed, the rudder moves to the right that moves the tailto the left and yaws the nose of the airplane to the right .

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SPEED BRAKES

The &oeing is e uipped with three hydraulic systems.The left, center and right systems deliver hydraulic "uidat a rated pressure of *+++ psig ( + bar) to operate "ightcontrols, "ap systems, actuators, landing gear and brakes.

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0T12 levators are hinge--mounted at the trailing

edge of the hori$ontal stabiliser. They are

operated by fore-and-aft movements of thecontrol column.

levators provide the longitudinal controlabout the lateral a%is. In the neutral positionof the control column the elevators are alsoat neutral. The aircraft maintains a steadyaltitude.

If the control column is moved back theelevators move up. This creates a loss of liftat the tail making it moving down. This down-

movement of the tail causes the nose of theaircraft to pitch upwards. The aircraftassumes a climbing attitude.

If the control is moved forward the elevators movedown. There is an increase in stabiliser lift, whichmakes the tail to move upwards. hen the tail movesup the nose of the aircraft pitches down and theaircraft assumes a diving attitude.

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#alaysian Institute of 0viation Technology

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