Aerodynamic Balences

Question 1

How does an inset hinge work?

Answer 1

Hinge is moved aft.

Question 2

What do horn balances do?

Answer 2

Create a moment force.

Question 3

How does an internal balance do?

Answer 3

An internal chamber that is exposed to static pressure.

Question 4

How does a balance tab work?

Answer 4

Control surface and balance move opposite directions.

Question 5

What does an anti balance do?

Answer 5

Tab deflects same way as control surface.

Question 6

When would you use a servo tab to move control surfaces?

Answer 6

Hydraulic failure.

Question 7

Spring tab is like a servo tab but is effective blank blank blank.

Answer 7

At low speeds.

Question 8

What does a mass balance prevent?

Answer 8

Flutter.

Question 9

Mass balance is not a what?

Answer 9

Aerodynamic balance.

Question 10

If the centre of gravity moves forward, the stick force (1) _____ and the elevator authority (2) _____.

Answer 10

Increased decreased

Question 11

An aircraft departs with MTOW and with the CG on the aft limit. On the return flight, due to no payload being carried the CG shifts to the forward limit. How will the static stability have changed on the second leg?

Answer 11

Increased

Question 12

Consider a large transport jet aircraft with a conventional tail design in straight and level flight. The horizontal stabiliser (tailplane) will be producing a force (1) _____, which will (2) _____ as the indicated airspeed increases.

Answer 12

Downwards increase

Question 13

Consider a large transport jet aircraft with a conventional tail design in straight and level flight. The horizontal stabiliser (tailplane) will be producing a force (1) _____, which will (2) _____ as the indicated airspeed increases.

Answer 13

Downwards increase

Question 14

If the thrust line is above the CG, how will this affect the airplane? Pitch up/down and stabilising/destabilising.

Answer 14

Pitch down stabilising.

Question 15

For a given elevator deflection, aeroplane longitudinal manoeuvrability decreases when CoG moves blank.

Answer 15

Forward.

Question 16

A T-Tail is more/less stabilising because it is more/less affected by downwash from the wing.

Answer 16

More - less

Question 17

An aeroplane, being manually flown in the speed unstable region, experiences a disturbance that causes a speed reduction. If the altitude is maintained and thrust remains constant, the aeroplane speed will:

Answer 17

Further decrease

Question 18

An aircraft is flying through the Intertropical Convergence Zone (ITCZ) at the planned cruising altitude when it experiences severe turbulence, which causes buffeting. Which action(s) should be taken?

1. Accurately maintain altitude,
2. Increase altitude,
3. Set turbulence speed,
4. Descend to a lower level.

Answer 18

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