# Shared Flashcard Set

## Details

Lesson 12
lesson 12
32
Aviation
Professional
07/24/2012

Term
 Bernoulli’s Principle states: “The internal pressure of a fluid ________ at points where the speed of the fluid
Definition
 decreases; increases
Term
 When air is forced to travel at a faster speed across the top of a wing versus the bottom, this will result in ________ the wing
Definition
 lower pressure above
Term
 Which statement best expresses Newton’s Third Law of Motion
Definition
 For every action, there is an equal and opposite reaction
Term
 The three principle airfoils on an aircraft that produce lift are
Definition
 wing, propeller, and horizontal tail surfaces
Term
 An imaginary straight line drawn from the leading edge to the trailing edge of a cross section of an airfoil is called the
Definition
 chord line
Term
 The direction of the relative wind is determined by the
Definition
 flight path of the aircraft
Term
 What force in flight counteracts lift?
Definition
 Weight
Term
 What is used to determine the angle of attack
Definition
 Relative wind and chord line
Term
 9. Actual atmospheric pressure at a given time and place does not depend on which of the following
Definition
 Wind
Term
 For an aircraft to maintain a constant airspeed and maintain straight and level flight, what must be in balance?
Definition
 Thrust and drag; lift and weight
Term
 Which are the primary control surfaces on an airplane
Definition
 Rudder, ailerons, and elevator
Term
 Movement around the vertical axis is controlled by the
Definition
 rudder
Term
 Movement around the longitudinal axis is called
Definition
 roll
Term
 Which action would cause a change in pitch?
Definition
 Pushing the control yoke
Term
 Which control allows the pilot to relieve manual pressure on the primary controls?
Definition
 Trim tab
Term
 At approximately what angle of attack will air no longer flow smoothly over the wing’s upper surface?
Definition
 15-20
Term
 The most hazardous aspect of structural icing is
Definition
 airfoil distortion
Term
 What type of icing is an aircraft likely to encounter when flying in temperatures above freezing
Definition
 Carburetor icing
Term
 The forces that are acting on a helicopter in flight are lift, thrust, _______, and _______
Definition
 weight, drag
Term
 What term defines a maneuver in which a helicopter is in motionless flight over a reference point, and maintaining a constant heading and altitude
Definition
 Hovering
Term
 What is the basic purpose of the autorotation maneuver in a helicopter
Definition
 Provide a controlled landing when the engine is no longer supplying power
Term
 The pitch (angle of attack) of a helicopter rotor blade is controlled by the
Definition
 collective
Term
 The primary source of lift on an airfoil is created by a differential in ________.
Definition
 pressure
Term
 The statement, “the internal pressure of a fluid decreases at points where the speed of the fluid increases” is a part of ________.
Definition
 Bernoulli’s Principle
Term
 What are the three principle airfoils
Definition
 wings, horizontal tail, propeller
Term
 What is the curvature of the airfoil from the leading edge to the trailing edge
Definition
 Camber
Term
 Which two movements are controlled by the control yoke
Definition
 Roll and pitch
Term
 Which of the following is a primary control surface
Definition
 Rudder
Term
 The extension of flaps causes an increase in ________.
Definition
 drag
Term
 . Lift is created as air flows smoothly over an airfoil. A stall occurs when the ________ of ________ is exceeded.
Definition
 critical angle of attack
Term
 Air stops flowing smoothly over an airfoil between _________ and ________ degrees angle of attack
Definition
 15-20
Term
 What are the three primary causes of stalls?
Definition
 Airspeed, violent flight maneuvers, wind shear
Supporting users have an ad free experience!