49 Questions
With respect to differential aileron control, which of the following is true?
The down going aileron moves through a smaller angle than the up going aileron.
The aircraft fin is of symmetrical airfoil section and will therefore provide a side-load:
if a suitable angle of attack develops due either yaw or rudder movement.
If the left wing of an aircraft is flying low, the aileron trimmer control in the cockpit would be:
moved up causing the left aileron to move down.
The purpose of a slot in a wing is to:
act as a venturi, accelerate the air and re-energize the boundary layer.
Large flap deployment causes:
increased spanwise flow towards the tips on the wing lower surface.
On a swept-wing aircraft, which part of the wing stalls first?
The tip stalls first.
During flight, if an aircraft is yawing to the right, the aircraft would have a tendency to fly:
right wing low.
With a drop in ambient temperature, an aircraft's service ceiling will:
rise.
Extending a leading edge slat will have what effect on the wing's angle of attack?
Decrease the angle of attack.
To ensure a wing stalls at the root first, stall wedges are installed:
on the wing leading edge at the wing root.
As a subsonic aircraft increases speed, what happens to its Centre of Pressure?
Moves aft
Which flight control surfaces are associated with asymmetric wing spoiler deployment?
Ailerons
If an aircraft is yawing to the left, which way should the trim tab on the rudder be positioned?
To the left
If an aircraft is flying with a left wing low, how should the left aileron trim tab be adjusted?
Moved up
What is the purpose of the slot in the wing when a leading edge flap is fully extended?
To re-energize the boundary layer
Which of the following statements about the Centre of Pressure is true for a subsonic aircraft?
It moves aft as angle of attack decreases
What happens to the drag on the outer wing when the ailerons are deflected?
Drag increases on the outer wing
What movement is controlled by the Dutch roll?
Yaw and roll
What happens when an aircraft is aerodynamically stable?
The aircraft returns to the trimmed attitude
What plane do the ailerons control the aircraft in?
The lateral plane
What is the main purpose of an anti-balance tab?
To give more feel to the controls
What is the primary function of slats?
Keep the boundary layer from separating for longer
What should the pilot do to the aircraft's nose when extending the flaps?
Lower the nose to reduce the angle of attack
What is the primary use of flight spoilers?
To decrease lift and allow a controlled descent without reducing airspeed
If the aircraft is flying nose-heavy, which direction should you move the elevator trim tab?
Down to move the elevator up
When are wing tip vortices the strongest?
When flying slowly at high angles of attack
What type of instability is characterized by roll and yaw?
Dutch roll
What is the primary function of vortex generators on an aircraft?
Move the transition point forwards
How do leading edge flaps affect the stalling angle of a wing?
Increase the stalling angle
Where are Krueger flaps typically located on an aircraft?
On the leading edge
How does sweepback affect the lateral stability of an aircraft?
Increases lateral stability
What is the effect of a plain flap on the wing area?
It does not increase the wing area on deployment
What is the primary cause of a roll to the right on an aircraft fitted with spoilers for lateral control?
Right spoilers extending, left spoilers remaining retracted
What does a Dutch roll refer to in aircraft dynamics?
A combined yawing and rolling motion
In what direction will an aircraft pitch when the trailing edge flaps are lowered?
Pitch nose down
What causes pitch up on an aircraft with an all-moving tailplane?
Decreasing tailplane incidence
Which option correctly describes a leading edge slat's effect on the stalling angle of the wing?
Decreasing the stalling angle of the wing
What is the function of a Krueger flap on an aircraft?
A leading edge slat which extends forward
What is the layer of air over the surface of an aerofoil that is slower moving called?
'Boundary layer'
When the airflow velocity over an upper cambered surface of an aerofoil decreases, what happens to pressure and lift?
Pressure increases, lift decreases
What is the primary effect of increasing the weight of an aircraft?
Increasing the stall speed
In a banked turn, what is required to maintain level flight?
Extra lift
What is the primary function of flaps on an aircraft wing?
To increase the lift of the wing
If one wing flap is partially extended, what effect would it have on the aircraft?
A steady rolling tendency
How does increasing flap deployment affect the stalling angle of a wing?
Decreases the stalling angle
What is the effect of downward displacement of an aileron on the stalling angle of that wing?
Decreases the stalling angle
How does flap extension affect the tailplane angle of attack?
Causes a nose-up pitch
To maintain constant lift when extending flaps, what pitch adjustment is necessary?
Lower the nose
Which leading edge device improves laminar flow over the wing?
Slats
Study Notes
Aircraft Performance and Control
Centre of Pressure
- As a subsonic aircraft speeds up, its Centre of Pressure moves aft.
- This occurs when the aircraft reduces its angle of attack to remain at a constant altitude.
Wing Spoilers
- Wing spoilers, when used asymmetrically, are associated with ailerons.
- This is stated in the Pallett Automatic Flight Control 4th Edition and Jeppesen A&P Technician Airframe Textbook.
Trim Tabs
- If an aircraft is yawing to the left, the trim tab on the rudder should be positioned to the left.
- If an aircraft is flying with a left wing low, the left aileron trim tab should be moved up.
Leading Edge Flaps
- The slot in a wing, when a leading edge flap is fully extended, is used to re-energize the boundary layer.
- This is stated in the Pallett Automatic Flight Control 2nd Edition and Jeppesen A&P Technician Airframe Textbook.
Differential Aileron Control
- The down-going aileron moves through a smaller angle than the up-going aileron.
- This reduces the induced drag, which causes adverse aileron yaw.
Aeroplane Fin
- The aeroplane fin is of symmetrical aerofoil section and will provide a side-load if a suitable angle of attack develops due to either yaw or rudder movement.
Aircraft Stability
- If an aircraft is aerodynamically stable, it will return to its trimmed attitude.
- A drop in ambient temperature will increase an aircraft's service ceiling.
Flight Control
- Ailerons control the aircraft in the lateral plane.
- An anti-balance tab is used to give more feel to the controls.
Flaps and Slats
- Slats keep the boundary layer from separating for longer.
- Large flap deployment causes increased spanwise flow towards the wing tips.
- Leading edge flaps increase the stalling angle of the wing.
- Split flaps increase drag with little lift coefficient increase.
- Fowler flaps increase wing area and camber.
Aircraft Instability
- Dutch roll is a combined yawing and rolling motion.
- Sweepback will increase lateral stability.
- A split flap will increase drag with little lift coefficient increase.
Airflow and Lift
- The boundary layer is the layer of air over the surface of an aerofoil that is slower moving.
- When airflow velocity over an upper cambered surface of an aerofoil decreases, pressure increases, and lift decreases.
Weight and Drag
- Changes in aircraft weight cause corresponding changes in total drag due to the associated lift change.
- An increase in aircraft weight will increase the stalling speed.
Stalling
- When an aircraft stalls, lift decreases, and drag increases.
- The angle of attack at which stall occurs can be varied by using flaps and slats.
- The primary function of a flap is to alter the lift of an aerofoil.
Miscellaneous
- The tropopause exists at about 36,000 ft.
- Induced drag curve characteristics of a slender delta wing are such that there is a decrease in gradient with wing speed.
- If an aircraft is yawing left, the trim tab on the rudder would be positioned to the left, moving the rudder right.
Test your knowledge of aircraft aerodynamics with questions on variables like Centre of Pressure and Wing Spoilers. Learn about the effects of speed changes and asymmetric spoiler use on aircraft performance.
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