04 Lift Augmentation & Stability

If a landing is to be made without flaps the landing speed must be:

• Reduced.

• Increased.

• The same as for a landing with flaps.

• The same as for a landing with flaps but with a steeper approach.

With a forward Centre of Gravity, an aircraft will have:

• Reduced longitudinal stability.

• Lighter forces for control movements.

• Decreased elevator effectiveness when flaring.

• Shorter take off distances.

Yawing is movement around the _____ axis.

• Longitudinal

• Lateral

• Normal

• Horizontal

During a manoeuvre, the ailerons are deflected and returned to neutral when the aircraft has attained a small angle of bank. If the aircraft then returns to a wings-level attitude without further control movement, it is:

• Neutrally stable.

• Statically and dynamically stable.

• Statically stable but dynamically neutral.

• Statically stable.

The maximum gliding distance from 6000 feet, for an aircraft in clean configuration, with a lift/drag ratio of 8:1, is approximately 8 nautical miles. If flaps are deployed:

• The maximum gliding distance will increase.

• The maximum gliding distance will be less.

• Lift/Drag ratio will be unaffected but will be achieved at a lower airspeed.

• The maximum gliding distance will be unaffected.

An aeroplane which is inherently stable will:

• Require less effort to control.

• Be difficult to stall.

• Not spin.

• Have a built-in tendency to return to its original state following the removal of any disturbing force.

An aircraft wing is constructed with positive dihedral in order to give:

• Lateral stability about the longitudinal axis.

• Longitudinal stability about the lateral axis.

• Lateral stability about the normal axis.

• Directional stability about the normal axis.

Which of the following four options describes the consequence of taking off with the manufacturer's recommended take-off flap setting selected?

• An increase in the length of the take-off run compared to a non-flap take-off.

• A decrease in the length of the take-off run compared to a non-flap take-off.

• A greater angle of climb.

• Easier avoidance of obstacles at the end of a runway.

Wing leading-edge devices such as slots, designed to allow flight at higher angles of attack, do so by:

• Providing an extra lifting surface and hence increase the lift available.

• Changing the shape and hence the lift characteristics of the wing.

• Re-energising the airflow over the top of the wing, delaying separation.

• Decreasing lift and hence induced drag.

If a disturbing force causes an aircraft to roll:

• Wing dihedral will cause a rolling moment which tends to correct the sideslip.

• The fin will cause a yawing moment which reduces the sideslip.

• Wing dihedral will cause a yawing moment which tends to correct the sideslip.

• Wing dihedral will cause a nose up pitching moment.