this creates excess drag in the direction to the "outside" of the turn, so aileron differential is used to. C. Control roll about longitudinal axis. The FBW system evolved as a way to reduce the system weight of the hydromechanicalsystem, reduce maintenance costs, and improve reliability. Without aileron differential, most airplanes require a certain amount of coordinated rudder to prevent—or at least minimize—adverse yaw. nose into the wind. B. An example of a moving earth axis system is an inertial navigation platform. Ailerons are used in pairs to control the aircraft in roll (or movement around the aircraft's longitudinal axis ), which normally results in a change. Design Process: Aileron Types. Scenario: Sat on the right wing. The most basic flight control system design and operate with a collection of mechanical parts such as rods, cables, pulleys, and sometimes chains to transmit the forces of the flight deck controls to the control surfaces. Discussion Aileron Differential? Electric Plane Talk. Study with Quizlet and memorize flashcards containing terms like 1 - Movement about the longitudinal axis (roll) in a helicopter is affected by movement of the A- collective pitch control. Differential control on an aileron system means that A- one aileron on one wing travels further up than the aileron on the opposite wing to adjust for wash in and wash out. Control Surfaces. 1. Roll or bank is the aircraft’s movement about its. Differential control on an aileron system means that a pulling tool. In this system the aileron and rudder systems are interconnected, so that when the ailerons are deflected the rudder automatically moves to counter the adverse yaw. Though not entirely eliminating adverse yaw, the "differential type" aileron system raises one aileron a greater distance than the other aileron is lowered for a given movement of. In the other, one aileron is jammed in a deflected position while the other responds normally. One aileron on one wing travels further up than the aileron on the opposite wing to adjust for wash-in and wash-out 45. The ailerons, elevator (or stabilator), and rudder constitute the primary control system and are required to control an aircraft safely during flight. Adverse yaw is the tendency of an airplane, when turning and banked, to go the opposite direction. then use the balance and sub-trim functions to fix any minor binding. Aerodynamics - Aileron Differential - Gentlemen, I have a 1/3 scale Sopwith pup and I just set up the ailerons to where the ailerons move 2. Rigging and alignment checks should not be undertaken in the open. 0) = -2. 0*aileron = 1. While. an unsteady flow from turbulence. I need to determine if my current 6 channel radio set from Hobbyking will be able to be pr. Finite element analyses were assessed for properly sizing the load-bearing structure and actuation systems and for. At low AOA (where control stick was forward), left right motion caused only aileron deflection. Note. Two aileron types. A full length aileron is more drag than a tip length aileron when deflected. Adverse yaw is the natural and undesirable tendency for an aircraft to yaw in the opposite direction of a roll. RE: Gyro for ailerons questions. Primary control systems. Aircraft flight control trim systems must be designed and installed so that the: A. B64C13/00 — Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes. The primary control surfaces of an airplane include the ailerons, rudder, and elevator. The differential is needed because the down aileron has more drag than the up aileron. 5 Mach number. Ailerons are used to control a plane’s longitudinal axis by altering the lift generated by each wing, with a pilot controlling the ailerons using a control wheel in the cockpit. Learn the definition of 'differential aileron'. The elevator, ailerons and rudder are known as control surfaces and the picture below shows where these are located on a plane: Above: location of ailerons, elevators and rudder on an rc plane. More camber means more lift, ie. Spoilers Sometimes called a lift dumper that is intended to intentionally reduce the lift of the component of an airfoil in a controlled way. Differential control on an aileron system means that A- one aileron on one wing travels further up than the aileron on the opposite wing to adjust for wash in and wash out. ”. Minimum recommended torque puls friction drag torque. Placing a piece of cloth around a stainless steel control cable and running it back and. It is caused by the difference in lift and drag of each wing. Differential ailerons With differential ailerons, one aileron is raised a greater distance than the other aileron is lowered for a given movement. Rigging and alignment checks should not be undertaken in the open, however, if this cannot be avoided, the aircraft should be positioned. The pilot changes the lift each wing produces to roll the aircraft in. This is a vital and crucial aspect of flight control. Ailerons are small hinged sections on the outboard portion of a wing. Differential Ailerons With differential ailerons, one aileron is raised a greater distance than. 71- If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move A- up and the elevator will move down. For those not aware of the reason for differential and why some of us want to eliminate it I'll explain. Differential control on an aileron system means that a. Fig. assist the pilot in moving the control surfaces. By turning an aileron one direction, and the opposite aileron the opposite direction, this will create roll in. Adverse yaw is caused by a lift and drag differential between your two wings. Although similar in concept, aircraft can be classified as fixed and rotary wing structures. Study with Quizlet and memorize flashcards containing terms like In a hovering helicopter equipped with a tail rotor, directional control is maintained by, If a single-rotor helicopter is in forward horizontal flight, the angle of attack of the advancing blade is, The dihedral angle of a wing may be measured by placing a straightedge and level protractor on the and more. B. An aileron (French for 'little wing') is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft. Once the designer has defined these parameters, it’s time to pay attention to the design details of the ailerons and the control forces needed to fly the airplane. This is how we turn the airplane. Oscillating glyph connected to the third rib segment of the morphing aileron [ 7 ]. In this case, since the raised aileron has as much or more surface area exposed to the airflow (thus increased drag) than. Today we look at aircraft design features that reduce aileron drag. Check out the pronunciation, synonyms and grammar. Introduction The primary flight control system uses conventional control wheel, column and pedals linked mechanically to hydraulic power control units which command the primary flight control surfaces; ailerons, elevators and rudder. 2. On outboard trailing edge of each wing. Secondary flight control. Aircraft Systems and Aviation – Concorde-1 ; Aircraft Maintenance Questions and Answers – Aircraft. 1. Roll is one of three ways of controlling airplanes. This produces an increase in drag on the descending wing, which reduces adverse yaw. Ailerons are used in pairs to control the aircraft in roll (or movement. at the servo arm, at the control surface horn, and by offsetting the surface hinge line to the top or bottom of the wing. g. This force causes the. Note: For the learning process any Dual Rate settings must be disabled, to ensure that the maximum control surface travels are learned. , 3 - The. Movement around this axis is called 'rolling' or 'banking'. 5. Pulley misalignment. Superior ergonomics that fit the way you fly. (Normal would mean more up than down. Half of a wing with defined control surface is defined in Figure 2. I need to determine if my current 6 channel radio set from Hobbyking will be able to be pr. The trim tab reduces hinge moment and control surface efficiency. The F-15 control system is powered by three separate hydraulic systems: Power Control One (PC-1) driven by the left engine. This adverse yaw can also be prevented by the use of, Frise ailerons During inspection of the flight control system of an airplane equipped with differential-type aileron control, side to side movement of the control stick will cause A each aileron to have greater up travel (from the streamlined position) than down travel. Washing-in the left wing of a monoplane, for purposes of rigging corrections after flight test, will have what effect on. Typically, the downward-deflected aileron creates more drag than the upward-deflected one, which causes adverse yaw (that is, the nose moves opposite the intended direction of turn). Increases force needed by. With ailerons, things are a bit different because they are part of a lifting surface. The zero force or "hands-off-stick" position may be varied as the pilot requires by activation. Contents hide. The behavior of the trailing edge when the surface is suspended from its hinge points. However, note that the use of a modal basis is not a. Differential control on a aileron system means that. Adverse yaw. 2Figure 3 shows a representative control stick with differential aileron gearing. Applying this technique to the airplane flight dynamics near stall, a new rolling mechanism is discovered through nonlinear interactions between. An example ofThe autopilot overpowers the trim and holds the control wheel where it is required for heading/track control. This balancing of the drag forces helps minimize adverse yaw. 30. My thinking is that if you split the flaperon into 2 sections you might have more aileron control at lower speeds. using a dihedral board and bubble level along the front spar of each wing. primary flight controls. 250-model internal memory. 1. Adjust clevis to center transmitter trims, or reset computer trims. 257 studied the influence of flap camber on the wing flutter bounds, and designed an LQG compensator to control the flap deflection to actively suppress the aeroelastic response. In the present research, in order to improve aileron effectiveness, several. interconnection Patented Dec. 8, 1925. Adverse yaw is a bunch of drag that gliders can do without. . One aircraft I can think of which merges both worlds together is the V-22. 1. In models there's three places. It is located on the outboard section of each wing and works in tandem with other control surfaces to control the aircraft’s roll during flight. Typically, an elevator on the horizontal tail is used to control the pitch. On the outer rear edge of each wing, the two ailerons move in opposite directions, up and down, decreasing lift on one wing while increasing it on the other. I can't remember the exact figures, but lets say it required 10mm up aileron and 5mm down. If the engines are mounted under the centre of gravity, as in underwing passenger jets, then increasing the thrust will raise the nose while decreasing the thrust will lower it. Brenden and Edward M. 23390 Lateral control is given by A the ailerons around the lateral axis B the from AEROSPACE, 123 at Institute of Technology, CarlowAileron differential simply means that the ailerons move more in one direction than the other, with the greater deflection being upwards. The amount of differential is sufficient to balance the drag between the ailerons, thus eliminating the yaw effect. Direct access to system setup from function menu - no need to. Elevons or tailerons are aircraft control surfaces that combine the functions of the elevator (used for pitch control) and the aileron (used for roll control), hence the name. 1 76 Answer B JSAT 1 45 AC65 15A When cables are rigged excessively tight it from AMT DEPART 425 at PATTS College of AeronauticsForums; Magazine; Blogs; Classifieds; Places; More; Search; Sign Up. Checking for equal distribution of weight throughout the control surface. Guess I should have said a little more in my last post. Aileron differential helps keep the model’s tracking straight. In this paper, we review the concept of Lie brackets and how it can be exploited in generating motion in unactuated directions through nonlinear interactions between two or more control inputs. Control Centering: Fly straight and level. The rudder is one (or more than one) movable flap, located on the trailing edge of the vertical. The aileron control system preliminary. an elevator controls _____ about the____ axis. C. The tail drops. limit the extension stroke. (The aileron can deflect up more than it can deflect down, reducing amount of drag on the upper wing and the rudder pressure required for compensation for adverse yaw). In a turn most DLG want to spiral into the turn, so opposite aileron is given to maintain bank angle. The aileron, designated as AIL in the Boeing 737’s flight control system, is a movable surface on the wings of the aircraft. C. A total of four ailerons are attached to the main wing and grouped into inner. Explanation. Google has not performed a legal analysis and makes no representation as to the accuracy of the. Differential ailerons function in the same manner as symmetrical. The system (10) forms a generalized linear eigenproblem. D) left aileron: 5° down Right aileron: 2° up. roll) control of an aircraft; however, it also affects the directional control. wing flaps, leading edge devices, spoilers, and trim systems. You might also hear this setup being called differential ailerons. When you roll right, the opposite happens. The AR636 in the Pitts can be configured for a two-servo aileron setup, which would then allow you to manage differential in the TX. Also, for a given control input, the servo has to work harder. A. The aileron sectors transmit move- ment of the cable control system to the aileron control tabs and the aileron bus. Though not entirely eliminating adverse yaw, the "differential type" aileron system raises one aileron a greater distance than the other aileron is lowered for a given movement of the control stick or wheel. 1) Differential Ailerons: One aileron is raised a greater distance than the other aileron is lowered. Explanation: The ailerons are used to control the aircraft in roll. The airfoil generates the lift force Y. Differential is usually more up, less down. 8284-During inspection of the flight control system of an airplane equipped with differential type aileron control, side to side movement of the control stick will cause? Each aileron you have a greater up travel (from the streamlined position) than down travel. fairleads should never deflect the alignment of a cable more than. Control roll about longitudinal axis. This form of cross-coupling was often built into the cable-and-pulley control systems of older aircraft. With which system is differential control associated. Servo power is effectively reduced when the total servo movement (termed travel volume by Futaba) is reduced. How Ailerons Work. In very. The aileron shape modification is then implemented by means of an actuation system, based on a classical quick-return mechanism, opportunely suited for the presented application. Once the designer has defined these parameters, it’s time to pay attention to the design details of the ailerons and the control forces needed to fly the airplane. Ailerons that are set up this way are called differential ailerons. Marcot3ch. Like the differential aileron, the Frise-type aileron does not eliminate adverse yaw entirely. Control deals with the issue of whether the aerodynamic and propulsive controls are adequate to trim the vehicle (i. Some control systems are so poorly designed 4 that they may only achieve 25% of the maximum deflection. 79- Differential control on B- the up travel is more than the down travel. e. I have heard things like to help rolll straight to asssist in scale like turns etc. I haven't seen anything in print to explain what it does for me or how far I can go with it. , Differential control on an aileron system means that. RECREATION253 - During Inspection Of The Flight Control System Of An Airplane Equipped With. 9. It’s very difficult to roll your model in a straight line. e, assymetrical induced drag on the inside and outside wing during a turn. Mechanical Flight Control System. , cruise with an initial heading angle) to another trim condition (e. In flight there is little difference in control feel or sensitivity the only difference is on the ground. Control is defined as the process to changing the flight condition from one trim condition (e. This paper evaluates the flight quality of an aileron-free full-wing configuration UAV and proposes a highly robust attitude controller considering the typical control problems (i. The aircraft control system controls the whole flight movement process. This block takes the input u and produces the output α. A gust lock system is provided for the aileron controls to protect the aileron sur-Individually operable ailerons pivotable to extend a forward end below a bottom wing surface and a rearward end above a top wing surface. This movement is referred to as "roll". Typically, this means you need to deflect your rudder in the opposite direction of your ailerons (away from the crosswind) to stay on the runway centerline. In this paper, the design concept of the aileron with a fixed connector and a moving connector has been explored due to the improvement of aileron effectiveness. 1924 2 Sheets-Sheet 2 HIM INVENTOR ATTORNEY HARVEY CMUMMERT. Ailerons. Thus, the fault diagnosis of aileron actuators is vital in the enhancement of the reliability and fault tolerant capability. Study with Quizlet and memorize flashcards containing terms like The _________ are controlled by pushing or pulling the control yoke forward or aft. c ontrol activation. Rigging and alignment checks should not be undertaken in the open, however, if this cannot be avoided, the aircraft should be positioned. The normal convention for aileron differential is that increased aileron differential means that the upward going aileron has increased travel as compared to the downward moving aileron (the opposite of the sign convention in the quote). induced drag (that's why that wing goes up!) The increased drag on the down aileron causes a yaw in that wings direction, thus the need for differential. Contents hide. The aileron shape can be, in this way, adaptively controlled to realize camber variations. around or about the longitudinal axis controlled by the ailerons. Buffeting is the intermittent application of forces to a part of an airplane. A raised spoileron also increases the drag on the wing where it is deployed, causing the aircraft to yaw. Most aircraft have some means of preventing, or. Use transmitter trims for hands off straight and level flight. . The vertical axis but not the longitudinal axis. Aileron differential simply means that the ailerons move more in one direction than the other, with the greater deflection being upwards. Ailerons designed to reduce adverse yaw. 1. Washed out. In light aircraft the control surfaces. They are critical for the safe operation of the aircraft. Moreover, the cascade control system has been exercised in developing roll attitude control for the aircraft with multiple aileron segments. Differential ailerons work by equalising drag on up going and down going wings. , An airplane that has a tendency to gradually increase a pitching moment that has been set into motion has. roll, longitudinal. Consists of a mechanical circuit and a hydraulic. Hi Ken, The main reason for the differential, is to help make the turns smooth, the greater travel on the up aileron helps yaw the airplane in the intended direction. A flaperon system is somewhat simpler than a flap plus drooping aileron system, but it has similar issues with adverse yaw. Forums; Magazine; Blogs; Classifieds; Places; More; Search; Sign Up | Log InWhen two aileron servos and the flaperon function are used, adverse yaw can be lessened by programming a small amount of differential aileron travel (for example, approximately 5° less down aileron than up), consequently improving control and producing cleaner axial rolls. The pilot controls the forces of flight and the aircraft’s direction and attitude by means of flight controls. Para 1 - confirming the question is a valid one and confirming it is actually the case. The concept of differential ailerons is straightforward. Rotation – Control Axes. As the name implies, they deflect by different amounts: When the stick or yoke is moved to the right, for example, the aileron on the right (descending) wing is deflected up much more than the left (ascending) wing’s. 73- During inspection of the flight control system of an airplane equipped with differential-type aileron control, side-to-side movement of the control stick will cause A- each aileron to have a greater up travel (from the streamlined position) than down travel. Select a Model Memory using Model SEL in the SYSTEM Menu. Autopilot is an automatic flight control system that keeps an aircraft in level flight or on a set course. With reference to differential aileron control. Wrote historian C. August 31, 2020. (The aileron can deflect up more than it can deflect down, reducing amount of drag on the upper wing and the rudder pressure required for compensation for adverse yaw). When you execute a right turn in the air, you’ll turn the control wheel or stick to the right, and the right aileron will deflect upward. B. Nothing1235. This causes the airplane to roll to the left or right. The primary function of the aileron is to provide lateral control. This would necessitate a major alteration of which I have not been able to figure out a simple solution. *C- down and the elevator will move down. 4, laterally/directionally motions are highly coupled, so the control of these two motions are discussed together. Cieslak,. Each aileron has two sectors, a top and a bottom. Do ailerons increase drag? The extra upward aileron movement produces more drag change than. For most designs, though, the trailing edges of the flap, wingtip and aileron should fair together to form a straight line or. The aileron control surface is hinged to the wing frame; the links between the servo and the aileron hinge are also taken into account and their positions with respect to the l F wing station are defined as l a 1 and l a 2, see Fig. Study with Quizlet and memorize flashcards containing terms like Improper rigging of the elevator trim tab system will affect the balance of the airplane about which axis?, What is lateral control?, What is longitudinal control? and more. Does not change when in flight. The idea is to have the servo arm command the ailerons movement. 7 Flight Control Computers Computer systems are now a common and essential part of many modern flight. Frise type ailerons. . The differential control causes the up-moving aileron to move a greater distance than the down-moving aileron. This somewhat mathematical term aims to describe the reaction of an airplane to a given aileron input, for the moment ignoring the coupling effects (which we deal with later). Secondary control systems. The elevators of a conventional airplane are used to provide rotation about the lateral axis longitudinal axis vertical axis. DIFFERENTIAL AILERONS With differential ailerons, one aileron is raised a greater distance than the other aileron is lowered for a given An aircraft 'rolling', or 'banking', with its ailerons. Excessive wear on both of the sides of a control cable pulley groove is evidence of. The purpose in checking main rotor blade tracking is to determine the. Thus, it is a good practice to design aileron and rudder concurrently. With the nose into the wind. Anti-balance or Anti-servo. Principal axes. If you don't have aileron differential, you may see a bit of adverse yaw, that means that the nose of the airplane will actually turn a bit opposite of the bank. When the ailerons deflect. drag increases on the outer wing. With the control lock engaged, the maximum deflection of the nosewheel is restricted to 60° either side of center. As the total servo throw is decreased, the proportion of play, or slop, in the control system is effectively increased. The ailerons are the flight controls that roll the airplane around its longitudinal axis. Differential ailerons function in the same manner as symmetrical ailerons except that the upward deflecting aileron is displaced a greater distance than is the downward deflecting aileron. In this paper, by taking advantage of the strong leaning and intelligent. The flap conforms to the shape of the upper surface of the wing when not in use and is designed reduce the flow of air through the slot. The direct adjust function lets you make changes to a given parameter in flight so you can get instant feedback. Differential control on an aileron system means that The up travel is more than the down travel A tension regulator in the flight control cable system of a large all-metal aircraft is. Differential ailerons function in the same manner as. Aierons, elevator (or stabilator), and rudder. The airplane is controllable around its lateral, longitudinal, and vertical axes by. Use the greater of the two throws whenDiscussion Aileron differential Electric Plane Talk. Aileron differential helps keep the model’s tracking straight. This helps equalize the drag created by the lowered aileron on the opposite wing and thus reduces adverse yaw. A: Ailerons control the roll of an aircraft. YOUR MODEL IS EXPERIENCING ADVERSE YAW IF: The model skids through turns. , Differential control on an aileron system means that. This movement is referred to as "roll". 3. Finite element analyses were assessed for properly sizing the load-bearing structure and actuation systems and for. Because of the need for both roll and high lift from the same set of surfaces, the flaperon symmetric deflection is limited by the need to retain some capability for roll control. 71- If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move A- up and the elevator will move down. Around or about the lateral axis and controlled by the ailerons. Discussion The Differential Pressure is controlled by the differential control to ensure that it does not exceed the maximum for which the aircraft is designed. Conventional flight controls consist of a stick or wheel control column and rudder pedals, which control the movement of the elevator and ailerons and the rudder, respectively, through a system of cables or rods. Study with Quizlet and memorize flashcards containing terms like Primary Control Surfaces, Secondary Control Surfaces, Ailerons and more. The pilot changes the lift each wing produces to roll the aircraft in. If a pilot reports that an airplane flies left wing heavy, this condition may be corrected by increasing the angle of incidence of the left wing, or decreasing the angle of incidence of the right wing, or both. It has differential ailerons & a mass balance or paddle to counteract adverse yaw. 14. Some aircraft aileron systems are rigged so that when there is no airload both ailerons will be a few degrees below the trailing edge of. This means when the control column is moved in any direction right or left, the up-going aileron moves through a greater angle of attack than the down-going aileron. This preview shows page 5 - 10 out of 18 pages. 8270. In its most basic form, a pilot could enter what is called aileron differential, which means that the up travel of a given aileron will be greater than the downward travel, which for most. > Activate the flaperon wing type or, depending on your radio system, the dual aileron function. The nose swings out of the turn. The cable rotates the right aileron bellcranks, and the push-pull tube connected to it raises the right aileron. Tobin, Seattle, Wash. Aileron. The most common aircraft cable diameters are 1/16 through 5/32 with 7x7 or 7x19 construction. rigging and alignment checks should not be undertaken in the open. These flight control surfaces create a differential in the amount of lift each wing. Example: Let's say I want to change the sub trim on the left wing ailerons [2]. >The FO SIDE controls the SPOILERS. Trim. It also sounds like the control response will be hotter than with normal ailerons, which might mean your throws become too. An ideal behavior would be one that goes to zero as time goes to infinity. The aileron control system preliminary. They are frequently used on tailless aircraft such as flying wings. ( I think the first aircraft to use this technique was F-15, where it was implemented using mechanical linkages in the flight controls). You can see that when the stick is pushed full over, the up aileron cable from the control stick moves farther than the down aileron cable, so this results in a change of cable tension due to this built-in stretching, which is dependent upon the geometry. > If differential mix is backwards (more down than up. l F06 Why is it generally necessary to jack an. the atmosphere, based on dry atmosphere is made of of largely nitrogen, oxygen and other gases. Ailerons are mounted on the outboard trailing edge of the wings. The extra upward aileron movement produces more drag change than an increase in AOA on the downward aileron. The aileron moving upward moves approximately twice as far as the aileron moving downward, as shown in Fig. The advantages of PID control could be concluded as simple structure, robustness of system inertia matrix, specific physical meaning, and so on. When the rudder pedals are depressed, the ruddervators move differently and act as a rudder. An example of differential aileron deflection during initiation of left turn is: A) left aileron: 2° up Right aileron: 5° down. Figure 7:Pulley system, Elevator ,aileron and rudder control The pulley system depends on the pilots muscles. co. The aileron shape modification is then implemented by means of an actuation system, based on a classical quick-return mechanism, opportunely suited for the presented application. B. The instructions say to adjust the servo arms to set the ailerons up for less travel down than up (presumably to reduce adverseNote that the control system will stretch in flight reducing the maximum ground deflection. The ailerons are used to bank the aircraft; to cause one wing tip to move up and the other wing tip to move down. As usual, aileron reversal or the blocking phenomenon of multijoint fixed ailerons is a hard nut to crack. The wing with the UP aileron has had its angle of attack with respect to the stab reduced more then the other side was increased because it started out with a positive angle initially. Option C. g. It is also much less efficient at producing roll. 0*aileron Left control surface: 1. (8)An aileron is a moving section at the back end of a plane that deflects upwards or downwards. Tech Log - 737-800 Aileron Movement - Hi, Recently flew return sectors in the pax cabin of a 738. This would require squaring off the tips. Differential ailerons. As the name implies, they deflect by different amounts: When the stick or yoke is moved to the right, for example, the aileron on the right (descending) wing is deflected up much more than the left (ascending) wing’s. BEE/VDE/V @MQQWJ United States Patent AIRCRAFT WING AND AILERON CONTROLS Kermit E. e. Its fault detection can assist the aircraft PHM system in making decisions and completing the targeted maintenance, which is of great significance to improve the safety and reliability of the aircraft. The down-going aileron is normally deflected through a greater angle than the up-going ailerons; hence, the differential drag they produce results in the yaw. Aileron actuators are pivotal components for aircraft flight control system. SEL function of the SYSTEM. C. Collective pitch. It was mentioned that conventional monoplanes are equipped with two ailerons, one being attached to the trailing edge.