Gleim Study unit 1 – Flashcards
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What determines the longitudinal stability of an airplane?
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The location of the CG with respect to the center of lift.
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When are the four forces that act on an airplane in equilibrium?
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During unaccelerated flight.
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The acute angle A is the angle of.....
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attack.
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What is not a primary flight control surface?
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flaps, trim tabs, leading edge devices, spoilers
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The angle of attack at which an airplane wing stalls will...
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remain the same regardless of gross weight.
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During an approach to a stall, an increased load factor will cause the aircraft to
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stall at a higher airspeed
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Changes in the center of pressure of a wing affect the aircraft's
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aerodynamic balance and controllability
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Angle of attack is defined as the angle between the chord line of an airfoil and the
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direction of the relative wind
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How does frost affect the lifting surfaces of an airplane on takeoff?
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Frost may prevent the airplane from becoming airborne at normal takeoff speed.
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The angle between the chord line of an airfoil and the relative wing is known as the angle of
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attack
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Loading an airplane to the most aft CG will cause the airplane to be
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less stable at all speeds
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Trim systems are designed to do what?
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They relieve the pilot of the need to maintain constant back pressure on the flight controls.
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What is one purpose of wing flaps
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To enable the pilot to make steeper approaches to a landing without increasing the airspeed
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Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?
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Turns
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The left turning tendency of an airplane caused by P-factor is the result of the
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propeller blade descending on the right, producing more thrust than the ascending blade on the left
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Ground effect is most likely to result in which problem?
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Becoming airborne before reaching recommended takeoff speed
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An airplane said to be inherently stable will
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require less effort to control
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The elevator controls movement around which axis
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Lateral
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How will frost on the wings of an airplane affect takeoff performance?
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Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability
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When does P-factor cause the airplane to yaw to the left?
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When at high angles of attack
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The amount of excess load that can be imposed on the wing of an airplane depends upon the
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speed of the airplane
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speed of the airplane
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lift, weight, thrust, and drag.
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Which statement is true concerning primary flight controls?
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The effectiveness of each control surface increases with speed because there is more flow over them.
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Which statement relates to Bernoulli's principle?
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Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.
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Which device is a secondary flight control?
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flaps, trim tabs, leading edge devices, spoilers
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What causes an airplane (except a T-tail) to pitch nosedown when power is reduced and controls are not adjusted?
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The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.
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Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at
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less than the length of the wingspan above the surface
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In what flight condition must an aircraft be placed in order to spin?
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Stalled
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During a spin to the left, which wing(s) is/are stalled?
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Both wings are stalled
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Why is frost considered hazardous to flight?
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Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability
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The term "angle of attack" is defined as the angle
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between the wing chord line and the relative wind
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Which of the following is true concerning flaps?
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Flaps allow an increase in the angle of descent without increasing airspeed.
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What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?
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Lift equals weight and thrust equals drag
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What must a pilot be aware of as a result of ground effect?
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Induced drag decreases; therefore, any excess speed a the point of flare may cause considerable floating.
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What is ground effect?
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The result of the interference of the surface of the Earth with the airflow patterns about an airplane
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What force makes an airplane turn?
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The horizontal component of lift
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An airplane has been loaded in such a manner that the CG is located aft of the aft CG limit. One undesirable flight characteristic a pilot might experience with this airplane would be
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difficulty in recovering from a stalled condition
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What is the purpose of the rudder on an airplane?
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To control yaw
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As altitude increases, the indicated airspeed at which a given airplane stalls in a particular configuration will
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remain the same regardless of altitude
