Considering vertical modes of the flight guidance system, when using vertical navigation (VNAV) or managed climb/descent (CLB or DES), the aeroplane should...
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A
follow the vertical commands computed by the FMS, ensuring the aeroplane follows the flight path regardless of ambient conditions.
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B
only commence a climb or descent at the position computed by the FMS if a higher/lower (as appropriate) altitude is selected by the pilot first.
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C
commence a climb or descent once the aeroplane reaches the position computed by the FMS regardless of any altitude selection made by the pilot.
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D
only engage when the pilot selects it, when the aeroplane has no deviation from the calculated vertical profile in the FMS.
Vertical Navigation (VNAV)
VNAV provides vertical profile guidance through the climb, cruise, and descent phases of flight.
VNAV controls the path and speed to comply with waypoint crossing restrictions. Waypoint crossing restrictions are entered on the LEGS page waypoint line by pushing the applicable key on the right side of the CDU. Barometric altitude restrictions must be below the cruise altitude to be valid.
The speed descent normally begins automatically at the calculated Top of Descent, provided the MCP altitude is reset for the descent. At the T/D, the FMC commands pitch to maintain target descent speed.
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