Trimmable Horizontal Stabilizer Flashcards

1
Q

How is the Trimmable Horizontal Stabilizer (THS) normally operated in flight?

A

The flight control computers control trim functions automatically.

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2
Q

If no hydraulic power is available, what is the impact on the THS?

A

The THS requires hydraulic power from the GREEN or YELLOW systems in order to function.

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3
Q

If possible, how can the THS be positioned after a complete flight control computer failure occurs?

A

Mechanical trimming is possible by manually positioning the pitch trim wheel.

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4
Q

Explain what would happen if a pilot were to reach down and move the pitch trim wheel when all systems are working normally.

A

The trim will can be turned manually. However, manual inputs have priority over computer inputs, so the autopilot would disconnect (if engaged).

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5
Q

What happens to the THS after landing?

A

The trim automatically resets to zero.

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