Direct law A330

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Questions and Answers

What is the relationship described by pitch direct law?

  • Elevator deflection is proportional to stick deflection. (correct)
  • Elevator deflection is independent of stick deflection.
  • Elevator deflection is affected only by airspeed.
  • Elevator deflection is inversely proportional to stick deflection.

What happens to the maximum elevator deflection as the CG shifts?

  • It remains constant regardless of CG position.
  • It varies based on the position of the CG. (correct)
  • It only increases with forward CG.
  • It only decreases with aft CG.

What does the pilot need to adjust since there is no automatic trim available?

  • Flight path vector.
  • Elevator deflection automatically.
  • Throttle settings for power management.
  • Manual trim. (correct)

What is displayed on the PFD when manual pitch trim is needed?

<p>USE MAN PITCH TRIM (C)</p> Signup and view all the answers

Which function is inoperative under pitch direct law?

<p>The α floor function. (A)</p> Signup and view all the answers

What is displayed when MAN PITCH TRIM is activated in the presence of elevator faults( L + R )

<p>MAN PITCH TRIM ONLY (red) (D)</p> Signup and view all the answers

Under what condition does Vsw replace Vα prot and Vα max?

<p>When pitch direct law is active (A)</p> Signup and view all the answers

What does an amber 'USE MAN PITCH TRIM' indication in flare law signify?

<p>Pilot should adjust trim manually (A)</p> Signup and view all the answers

When is MAN PITCH TRIM ONLY displayed in red?

<p>When both left and right elevator faults are detected (C)</p> Signup and view all the answers

Flashcards

Pitch direct law

Elevator deflection is proportional to stick deflection.

Max elevator deflection

Changes based on the aircraft's center of gravity (CG).

Manual trim

Pilot adjusts trim to maintain stable flight.

PFD message (USE MAN PITCH TRIM)

Indicates the need for manual trim adjustment.

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Inoperative protections in pitch direct law

Certain safety features are disabled during use of pitch direct law.

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Vα prot and Vα max

These are replaced by Vsw, which is the maximum speed at which the aircraft can be flown in direct law or flare law without the need for the autopilot to intervene.

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USE MAN PITCH TRIM

A message displayed on the PFD (Primary Flight Display) indicating that manual pitch trim is required.

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MAN PITCH TRIM ONLY

A message displayed on the PFD indicating a failure in the left and right elevator systems, requiring manual pitch trim.

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Flare law

A special flight mode that provides a gentle descent for landing.

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Study Notes

Pitch Direct Law

  • Pitch direct law has a direct link between stick and elevator position; elevator movement is directly proportional to stick movement.
  • Maximum elevator deflection varies based on the aircraft's center of gravity (CG).
  • Controllability is optimal at forward CG and less sensitive at aft CG; this design is a compromise.
  • No automatic trim system; pilots must use manual trim.
  • A "USE MAN PITCH TRIM" amber message appears on the primary flight display (PFD) when the direct law is active.
  • All pitch protection systems are disabled when pitch direct law is engaged.
  • The alpha floor function (stall protection) is also disabled.
  • Alternate law (another pitch control system) provides overspeed and stall warnings.

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