Pitch Trim Runaway

While automated flight systems generally are reliable, we need to be vigilant and prepared to disable them.

After the primary flight controls—elevator, rudder and ailerons on conventional airplanes—the most frequently used secondary control is pitch trim. That’s because a typical flight in any airplane involves a range of speeds, and pitch trim is used to minimize control forces throughout the operating envelope. Even if the pilot can supply that force, it’s fatiguing. […]
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