In dual-channel autopilot operation on the A321, which statement is correct?

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Multiple Choice

In dual-channel autopilot operation on the A321, which statement is correct?

Explanation:
Dual-channel autopilot on the A321 uses two independent control paths, AP1 and AP2. Both can be engaged at the same time, feeding the flight control system to operate in parallel. This arrangement provides redundancy and cross-checking: if one channel has a fault or drift, the other maintains control, and the combined signals improve stability and accuracy. Describing AP1 or AP2 operating alone would imply single-channel operation, which is not the dual-channel setup. Therefore, AP1 and AP2 may operate in parallel to provide dual-channel control.

Dual-channel autopilot on the A321 uses two independent control paths, AP1 and AP2. Both can be engaged at the same time, feeding the flight control system to operate in parallel. This arrangement provides redundancy and cross-checking: if one channel has a fault or drift, the other maintains control, and the combined signals improve stability and accuracy. Describing AP1 or AP2 operating alone would imply single-channel operation, which is not the dual-channel setup. Therefore, AP1 and AP2 may operate in parallel to provide dual-channel control.

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