PHAK Chapter 6 Flight Controls
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Questions and Answers

What are the primary control systems in an aircraft?

  • Wing flaps and trim systems
  • Ailerons, elevator, and rudder (correct)
  • Vertical stabilizers and horizontal stabilizers
  • Spoilers and leading edge devices

    • Which of the following are secondary control systems in an aircraft?

  • Trim systems (correct)
  • Ailerons
  • Spoilers (correct)
  • Rudder

    • What is the function of ailerons?

    Control roll about the longitudinal axis.

    Define adverse yaw.

    <p>The tendency of an airplane to yaw away from the direction of aileron roll input.</p> Signup and view all the answers

    What are differential ailerons?

    <p>Ailerons that are rigged such that the aileron moving up moves a greater distance than the aileron moving down.</p> Signup and view all the answers

    What is meant by coupled ailerons and rudder?

    <p>Rudder and ailerons are connected to counteract adverse yaw.</p> Signup and view all the answers

    What is a flaperon?

    <p>A control surface that combines the functions of ailerons and flaps.</p> Signup and view all the answers

    Describe the elevator's function.

    <p>Regulates an aircraft's pitch.</p> Signup and view all the answers

    What is a T-tail design?

    <p>An aircraft with the horizontal stabilizer mounted on the top of the vertical stabilizer.</p> Signup and view all the answers

    Define a stabilator.

    <p>A single-piece horizontal tail surface that pivots around a central hinge point.</p> Signup and view all the answers

    What is a canard?

    <p>A horizontal stabilizer located in front of the main wings.</p> Signup and view all the answers

    What does the rudder control?

    <p>Yaw of an aircraft.</p> Signup and view all the answers

    Describe the function of plain flaps.

    <p>They increase airfoil camber, significantly increasing lift and drag.</p> Signup and view all the answers

    What is a split flap?

    <p>A flap deflected from the lower surface of the airfoil, producing greater lift than plain flaps.</p> Signup and view all the answers

    What do slotted flaps do?

    <p>Provide greater increases in maximum coefficient of lift.</p> Signup and view all the answers

    What is the purpose of trim tabs?

    <p>To adjust the angle of the control surface for maintaining desired aircraft orientation.</p> Signup and view all the answers

    What are balance tabs?

    <p>They are designed to decrease the control forces on flight surfaces.</p> Signup and view all the answers

    How do servo tabs function?

    <p>They help move the entire flight control surface in the desired direction.</p> Signup and view all the answers

    What are antiservo tabs used for?

    <p>To decrease sensitivity of control surfaces and function as a trim device.</p> Signup and view all the answers

    Study Notes

    Flight Control Systems

    • Primary Control Systems: Include ailerons, elevators (or stabilators), and rudders.
    • Secondary Control Systems: Consist of wing flaps, leading edge devices, spoilers, and trim systems.

    Ailerons

    • Function: Control aircraft roll about the longitudinal axis.
    • Operation: Moving the control stick/yoke right deflects the right aileron upwards and the left aileron downwards.
    • Effects: Upward aileron deflection decreases lift on that wing while downward deflection increases lift on the opposite wing, causing the aircraft to roll right.

    Adverse Yaw

    • Definition: The tendency of an airplane to yaw away from the intended direction due to differential lift and drag from aileron deflections.
    • Characteristics: More pronounced at lower airspeeds.

    Differential Ailerons

    • Design: Up aileron moves a greater distance than the down aileron, creating additional drag.
    • Purpose: Balances drag forces to minimize adverse yaw.

    Frise-Type Ailerons

    • Design: Aileron pivots on an offset hinge when raised, increasing drag.
    • Effect: Equalizes drag from the opposing lowered aileron, reducing adverse yaw and maintaining airflow over the lowered aileron.

    Coupled Ailerons and Rudder

    • Mechanism: Rods and springs connect rudders and ailerons to counteract adverse yaw.
    • Flexibility: Can be overridden for intentional aircraft slipping.

    Flaperons

    • Integration: Combine functions of ailerons and flaps, enhancing both roll control and lift.

    Elevator

    • Function: Controls aircraft pitch by regulating airflow over the tail.
    • Action: Up-elevator position decreases camber and pushes the tail down.

    Tail Designs

    • T Tail: Features a horizontal stabilizer mounted atop the vertical stabilizer.
    • V-Tail: Comprises two slanted tail surfaces that act as horizontal and vertical stabilizers.

    Stabilator

    • Definition: A horizontal tail surface that pivots around a central hinge, functioning as both stabilizer and elevator.

    Canard

    • Description: A horizontal stabilizer positioned in front of the main wings, enhancing control.

    Rudder

    • Function: Regulates yaw direction.
    • Operation: Pushing a pedal moves the rudder, affecting airflow and changing yaw direction. Most effective at higher speeds.

    Flap Types

    • Plain Flap: Increases airfoil camber for greater lift and drag, moving the center of pressure aft.
    • Split Flap: Extends from the lower surface, yielding a greater lift increase than plain flaps but generating significant drag.
    • Slotted Flap: Features a ducted design that enhances lift by preventing airflow separation at high angles of attack.
    • Fowler Flap: Slides backwards to increase both camber and wing area, significantly enhancing lift while minimizing drag initially.

    Leading Edge Devices

    • Components: Include fixed slots, movable slats, leading edge flaps, and cuffs.
    • Functionality: Enhance lift by directing airflow and delaying separation at high angles of attack.

    Spoilers

    • Purpose: Increase drag and reduce lift to control aircraft descent and roll, often used on gliders and some aircraft for roll control.

    Trim and Control Tabs

    • Trim Tabs: Adjust airflow to maintain control surface positions, reducing control effort.
    • Balance Tabs: Decrease control forces by moving in the opposite direction of the primary surface when deflected.
    • Servo Tabs: Assist control surfaces to move in the direction of pilot input, reducing workload.
    • Antiservo Tabs: Move similarly to control surfaces to decrease sensitivity and provide trim.

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    Description

    This quiz covers the key concepts from Chapter 6 of the PHAK, focusing on flight control systems. It includes definitions and functions of primary and secondary control systems, as well as details on ailerons and other components. Test your knowledge on how these controls impact aircraft movement.

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