Principles of Flight - AC

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Flashcards	149
Language	English
Category	Technology
Level	University
Created / Updated	25.12.2024 / 20.01.2025
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Differential aileron deflection is used to...

reduce wake turbulence.

avoid a stall at low angles of attack.

keep the adverse yaw low.

increase the rate of descent.

Which constructive feature reduces adverse yaw?

Differential aileron deflection

T-tail

Winglets

Wing dihedral

The right aileron deflects upwards, the left downwards. How does the aircraft react?

Rolling to the left, no yawing

Rolling to the left, yawing to the right

Rolling to the right, yawing to the right

Rolling to the right, yawing to the left

The aerodynamic rudder balance...

reduces the control surfaces.

reduces the control stick forces.

delays the stall.

improves the rudder effectiveness.

Which constructive feature provides less stick forces?

Differential aileron deflection

Aerodynamic rudder balance

Vortex generators

T-tail

What is the function of the static rudder balance?

To prevent control surface flutter

To limit the control stick forces

To increase the control stick forces

To trim the controls almost without any force

How can flutter at the controls be prevented?

Static rudder balance

Aerodynamic rudder balance

Higher speed

Lower speed

During cruise flight with constant power setting, an aircraft shows a permanent tendency to raise the nose. How can this tendency be eliminated?

By shifting the center of gravity backwards

By elevator deflection upwards

By deflecting the elevator trim tab downwards

By deflecting the elevator trim tab upwards

What is a bendable trim tab?

A balance mass at a control surface

A term for a rudder balance

A trim device adjustable in flight

A fixed tab attached to the rudder or the aileron

What is the task of trim tabs?

Reduction of adverse yaw

Ensuring dynamic stability

Avoiding permanent stick forces

Adjusting bank angle to center of gravity position

The trim tab at the elevator is deflected upwards. In which position is the corresponding indicator?

Neutral position

Laterally trimmed

Nose-up position

Nose-down position

What describes "wing loading"?

Wing area per weight

Drag per wing area

Drag per weight

Weight per wing area

What has to be considered regarding VNE?

It must not be exceeded in any case

It may be exceeded only in smooth air

It may be briefly exceeded in turbulent air

It depends on loading and turbulence whether it may be exceeded

Through which factor listed below does the load factor increase during cruise flight?

An upward gust

Higher aeroplane weight

A forward centre of gravity

Lower air density

Through which factor listed below does the load factor decrease during cruise flight?

A downward gust

An aft centre of gravity

Higher air density

Lower aeroplane weight

Which statement regarding the "constant-speed propeller" is correct?

The propeller keeps the airspeed constant

The pitch of the propeller rises with higher speeds

The RPM decreases with lower speeds

The set RPM is kept constant by the motor power (MAP)

What is the advantage of a "constant-speed propeller" compared to a "fixed-pitch propeller"?

It is more efficient over a greater speed range

It is less susceptible to interference by technical defects

It is designed to generate a higher thrust

It has a larger surface area and produces more thrust

The change in pitch at a propeller blade from the root to the tip ensures...

a nearly constant load by a constant effective angle of attack over the entire length of the blade.

the largest possible angle of attack at the blade tip.

that the most thrust is produced at the blade root.

that the most thrust is produced at the blade tip.

After an engine failure, the windmilling propeller...

generates drag rather than thrust.

generates neither thrust nor drag.

improves the properties of the glide.

has a greater pitch in feathered position.

During a descent at idle power with constant speed, the propeller lever is moved backwards. How do the propeller pitch and sink rate change?

Propeller pitch is increased, sink rate is decreased

Propeller pitch is increased, sink rate is increased

Propeller pitch is decreased, sink rate is decreased

Propeller pitch is decreased, sink rate is increased

Point number 4 in the figure indicates which flight state? See figure (PFA-008)

Minimum drag

Best gliding angle

Inverted flight

Stall

Point number 1 in the figure indicates which flight state? See figure (PFA-008)

Minimum drag

Best gliding angle

Inverted flight

Stall

Point number 3 in the figure indicates which flight state? See figure (PFA-008)

Minimum drag

Best gliding angle

Inverted flight

Stall

To keep speed and altitude constant during a turn, compared to horizontal flight, the pilot has to...

increase the angle of attack and increase the thrust.

keep the angle of attack constant and increase the thrust.

decrease the angle of attack and increase the thrust.

increase the angle of attack and keep the thrust constant.

The bank in a two-minute turn (rate one turn) depends on the...

TAS.

weight.

load factor.

wind.

In a co-ordinated turn, how is the relation between the load factor (n) and the stall speed (Vs)?

N is greater than 1, Vs is greater than in straight and level flight.

N is greater than 1, Vs is smaller than in straight and level flight.

N is smaller than 1, Vs is smaller than in straight and level flight.

N is smaller than 1, Vs is greater than in straight and level flight.

Which statement concerning a flight during a turn is correct?

More lift than in straight and level flight is needed

The same amount of lift as in straight and level flight is needed

Less lift than in straight and level flight is needed.

Less lift than in a descent is needed.

How is the balance of forces affected during a turn?

Lift force must be increased to compensate for the sum of centrifugal and gravitational force

A lower lift force compensates for a lower net force as compared to level flight

The horizontal component of the lift force during a turn is the centrifugal force

The net force results from superposition of gravity and centripetal forces

The elevator deflection during take-off rotation...

is increased for a front centre of gravity.

is increased at high speeds.

is increased for a rear centre of gravity.

is independent of the speed.

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Principles of Flight - AC

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