On a dual autopilot approach, at what altitude is the stabilizer automatically trimmed an additional amount nose up?

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Multiple Choice

On a dual autopilot approach, at what altitude is the stabilizer automatically trimmed an additional amount nose up?

When two autopilots are engaged on an approach, the airplane’s flight control system uses a built‑in trim logic to keep the airplane on the intended path and reduce pilot workload as you near the runway. As you descend and radio altitude falls below 400 feet, the system automatically applies a little extra stabilizer trim in the nose-up direction. This helps maintain the correct pitch attitude through the final approach phase, especially with flaps and landing configuration changing the aerodynamics, and it supports a smoother transition to the flare and landing. The trim boost isn’t active at higher altitudes (above 800 feet RA) and isn’t limited to exactly 400 feet; it’s triggered once you’re below 400 feet RA.

When two autopilots are engaged on an approach, the airplane’s flight control system uses a built‑in trim logic to keep the airplane on the intended path and reduce pilot workload as you near the runway. As you descend and radio altitude falls below 400 feet, the system automatically applies a little extra stabilizer trim in the nose-up direction. This helps maintain the correct pitch attitude through the final approach phase, especially with flaps and landing configuration changing the aerodynamics, and it supports a smoother transition to the flare and landing. The trim boost isn’t active at higher altitudes (above 800 feet RA) and isn’t limited to exactly 400 feet; it’s triggered once you’re below 400 feet RA.

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