For altitude constraints that are described as 'at or above', which altitude should be used for MCP control?

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Multiple Choice

For altitude constraints that are described as 'at or above', which altitude should be used for MCP control?

ATC clearance governs what you should hold on the MCP when an altitude constraint is described as “at or above.” You are required to stay at least at that constraint, but your current vertical target is the altitude you have been cleared to maintain. Setting the MCP to the clearance altitude keeps you compliant with ATC and the constraint, ensuring you don’t descend below what you’ve been authorized. If you used the next constraint’s altitude or the active-leg or published procedure altitude, you risk stepping below the clearance or not staying above the required point, which could violate the ATC clearance or the constraint timing.

ATC clearance governs what you should hold on the MCP when an altitude constraint is described as “at or above.” You are required to stay at least at that constraint, but your current vertical target is the altitude you have been cleared to maintain. Setting the MCP to the clearance altitude keeps you compliant with ATC and the constraint, ensuring you don’t descend below what you’ve been authorized. If you used the next constraint’s altitude or the active-leg or published procedure altitude, you risk stepping below the clearance or not staying above the required point, which could violate the ATC clearance or the constraint timing.

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