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Principles Of Flight > Longitudinal Control > Flashcards

Longitudinal Control Flashcards

1
Q

What happens to the elevator when you pull back on the stick?

A

They go up.

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2
Q

What should you do to the twim wheel and tab to push the nose down?

A

Put them up.

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3
Q

What does the use of trim tab do to elevator authority?

A

Reduces it,

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4
Q

What does THS stand for?

A

Trim able horizontal stabiliser.

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5
Q

What does a THS allow for in regards to C of G?

A

Forward.

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6
Q

What happens if you trim the aircraft mose down with a forward C of G?

A

Hard to rotate.

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7
Q

What happens if you trim an aircraft with a nose up trim whilst having an aft C of G?

A

Rotate early therefore possible stall or tailstrike.

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8
Q

The trim position should blank the C of G positon?

A

Counter.

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9
Q

If the C of G is forward, what should the trim position be?

A

Nose up.

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10
Q

If the C of G is aft, what should the trim position be?

A

Nose down.

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11
Q

What will hapen to the pitch of the aircraft if the leading edge of the trim in pitched down?

A

Pitch up.

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12
Q

What should you do to reduce the effects of a nose down jammed trim?

A

Fly slower and increase flaps.

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13
Q

What should you do to reduce the effects of a nose up jammed trim?

A

Increase thrust.

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14
Q

If a trim is jammed pitched nose up, what happens to the pitch of the aircraft?

A

Pitch down.

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15
Q

Which of the following affect the setting of the stabiliser trim for take-off?

  1. Flap setting
  2. CG position
  3. Actual take-off mass
  4. Outside air temperature
A

123

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16
Q

Aileron reversal can occur at high speeds when the wing with the down-going aileron twists, reducing that wing’s blank.

A

CL

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17
Q

You are in the cruise, allowing the aircraft to accelerate with the autopilot engaged. The pilot observes the control trim moving continuously, and the aircraft is struggling to maintain level flight. What could be occurring in this situation?

A

Trim runaway or faulty autopilot.

18
Q

If the elevator becomes jammed, the blank blank will work as a small elevator itself and so its effect will be reversed.

A

Trim tab.

19
Q

Stick forces, provided by an elevator feel system, depend on blank deflection, blank pressure.

A

Elevator and dynamic.

20
Q

On a jet transport aircraft flying at (1) _____ speeds, the outboard ailerons are (2) _____ to prevent (3) _____.

A

High - locked - control reversal

21
Q

In a fully powered flight control system, the pilot supplies the force to…

A

Move the servo valve.

22
Q

Which of the following aerodynamic balancing device enables big control surface change/movement with relatively small force needed to apply?

A

Servo tab

23
Q

A jet transport aeroplane exhibits pitch up when thrust is suddenly increased from an equilibrium condition, because the thrust line is below the:

A

C of G

24
Q

For a given aeroplane mass, a more aft CG position will blank the take-off distance and blank the take-off climb performance.

A

Decrease and improve.

25
Q

For a given aeroplane mass, a more aft CG position will blank the take-off distance and blank the take-off climb performance.

A

Decrease and improve.

26
Q

Rotation about the longitudinal axis of an aeroplane can be achieved by aileron deflection and

A

Rudder

27
Q

What axis is roll?

A

Longitudinal.

28
Q

Preparing to make a flight in a B737, you notice that the yaw damper is INOP, and after consulting the Minimum Equipment List (MEL), you see that flight without the yaw damper is restricted to not above FL170. Aerodynamic damping blanks with altitude.

A

Decreases.

29
Q

If the elevator becomes jammed, then the: elevator trim tab will be blank.

A

Reversed.

30
Q

Which of the following are reasons for trimming an aircraft in pitch?

  1. Changes of speed
  2. Changes of power
  3. Varying CG positions
  4. Lateral displacement of CG
  5. Changes of configuration
A

1235

31
Q

Comparing the differences between a horizontal trimmable stabiliser and an elevator trim tab, which of these statements are correct or incorrect?

I. A elevator trim tab is more suitable to cope with the large trim changes generated by the high lift devices on most jet transport aeroplanes.
II. A trim tab runaway causes less control difficulty.

A

Incorrect - correct.

32
Q

An elevator trim system is more sensitive to blank.

A

Flutter

33
Q

If the elevator becomes jammed, then the: Elevator trim tab’s effect will be blank.

A

Reversed

34
Q

Consider two elevator control systems:

  1. is fitted with a trim tab.
  2. is fitted with fully powered hydraulic controls and an adjustable horizontal stabiliser.

For both cases and starting from a trimmed condition, how will the neutral position of the control column change, after trimming for a speed decrease?

A

1 moves aft, 2 does not change.

35
Q

In the cruise, the pilot of a large commercial jet aircraft notices the trim wheels turning in one direction whilst the aircraft yoke moves in the opposite direction. What should the pilot do?

(1) Disengage the autopilot because the autopilot may be defective.
(2) Disengage the electric trim switches, as the autopilot masks the trim runaway and a problem with controlling the aircraft may arise.

A

Both correct

36
Q

One of the main disadvantages of stabiliser trim system, compared to a conventional trim tab system, is that… it is more complex and blank

A

Heavy

37
Q

What is the position of the elevator in relation to the trimmable horizontal stabiliser of an aeroplane with fully hydraulically operated flight controls that is in trim?

A

Zero

38
Q

The forward CG limit is mainly determined by the amount of pitch control available from the blank.

A

Elevator.

39
Q

A jet transport aeroplane exhibits pitch up when thrust is suddenly increased from an equilibrium condition, because the thrust line is below the:

A

CofG

40
Q

When an aeroplane wing’s angle of attack is increased, downwash causes the horizontal tailplane to experience… lower/higher AoA

A

Lower

41
Q

Rolling is the rotation of the aeroplane about the: axis

A

Longitudinal

Principles Of Flight (24 decks)

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