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AGK Systems > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

Primary Controls

A

Controls aircraft around its three axis.

Causes changes in aircraft’s flight path or attitude.

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2
Q

Axis and functions

A

Roll - Longitudinal

Pitch - Lateral

Yaw - Normal/Vertical

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3
Q

Mechanical Control Systems

A

System of cables, rods, levels and chains

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4
Q

Hydraulic Control Systems

A

Moved by hydraulic power but control valve may be operated mechanically

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5
Q

Electrical Control Systems

A

Cockpit controls send signal to control surface.

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6
Q

Manual Controls

A

Reversible, no artificial feel

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7
Q

Power Assisted Aontrols

A

Reversible, if loads are large enough, would give natural feel at high loads.

No artificial feel.

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8
Q

Fully Power Operated

A

Irreversible, no natural feel. Require artificial feel.

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9
Q

Manual Controls - Pitch Control

A

Cables can’t be pushed.

Therefore a system of 2 cables exists, one for up, one for down.

Cables must be set to the correct tension.

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10
Q

When are the outboard ailerons locked?

A

Upon flap retraction, where only the inboard ailerons are used.

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11
Q

Adverse Aileron Yaw

A

Yawing moment opposite to the rolling moment.

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12
Q

Preventing Adverse Aileron Yaw

A

Differential Ailerons

Frise Ailerons

Aileron-rudder coupling

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13
Q

Differential Ailerons

A

Spoilers are used.

Downgoing wing will have an increase in drag.

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14
Q

Frise Ailerons

A

Protruding up-going aileron on downgoing wing causes high drag. This will balance the adverse yaw out.

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15
Q

Aileron-rudder coupling

A

Aileron and rudder are connected automatically to counter adverse yaw

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16
Q

Effect of Temperature on Tension of Control Cables

A

Temperature increases, tension increases.

This is because the aircraft fuselage extends, therefore cables tense up more.

17
Q

Hinge Moments

A

Force x Distance.

Distance is from control surface centre of pressure.

18
Q

Duplicate Inspections

A

Any work performed on the flight controls must be inspected by an independent individual who is properly qualified.

19
Q

Set Back Hinge Line

A

Reduce Hinge Moment

Reduces effort you need.

Doesn’t reduce effectiveness.

20
Q

Horn Balance

A

No control loss effectiveness, overall moment reduces.

21
Q

Balance Tab

A

1) Control moves surface which drives a balance tab
2) Balance tab moves in opposite direction to control surface
3) Applied to TRAILING EDGE of surface

Some reduction in control effectiveness

22
Q

Servo Tab

A

Moving tab

Tab moves opposite direction to control surface

Ineffective at low speeds

23
Q

Spring Tab

A

Maximum assistance when stick forces are greatest (high speeds)

Reduce control loads at high airspeed

24
Q

Anti-balance Tab

A

Opposes control surface, tab will move in same direction.

Increase Control Effectiveness.

25
Q

Disconnect levers

A

Reduces rate of control output

26
Q

Protection against jamming of controls

A

Shear rivets can be used to allow remaining ailerons to be used following a seizure.

27
Q

Hydraulic Q feel

A

Takes pitot and static pressure, and the output of this is used to operate a Q feel actuator. The actuator then applies a force to the controls that is proportional to the dynamic forces.

28
Q

Trimmable hydraulic stabiliser (THS).

A

Less trim drag

29
Q

What does the RAT power

A

Flight controls

30
Q

Where are flight controls attached to?

A

The rear spar

31
Q

How can we reduce adverse aileron yaw?

A

Frise ailerons, differential ailerons, rudder-aileron coupling

32
Q

Fly By Wire System

A

Reduces weight, easier maintenance, prevents from exceeding flight envelope. Multiple layers of redundancy, and reversion to normal, alternate, direct modes.

33
Q

Flap Operation on Large Aircraft

A

Hydraulically Powered, electrical backup

34
Q

Auto slats

A

Extend when a certain AoA is exceeded

AGK Systems (10 decks)

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