In the transition layer, how should the aircraft's vertical position be expressed?

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Multiple Choice

In the transition layer, how should the aircraft's vertical position be expressed?

Explanation:
In the transition layer, the vertical position is communicated as altitude (feet MSL) during descent. The transition layer sits between the transition altitude and the transition level, where the boundary between using altitude and flight level isn’t fixed by pressure surfaces. As you descend through this region, sticking with altitude avoids ambiguity that would come from flight levels, which depend on a standard pressure reference that can shift in this layer. Therefore, expressing your position as altitude during descent provides a clear, unambiguous reference as you move toward the surface.

In the transition layer, the vertical position is communicated as altitude (feet MSL) during descent. The transition layer sits between the transition altitude and the transition level, where the boundary between using altitude and flight level isn’t fixed by pressure surfaces. As you descend through this region, sticking with altitude avoids ambiguity that would come from flight levels, which depend on a standard pressure reference that can shift in this layer. Therefore, expressing your position as altitude during descent provides a clear, unambiguous reference as you move toward the surface.

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