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VNAV PTH or ALT

Started by ASCTU744, Mon, 30 Dec 2024 08:29

ASCTU744

https://www.youtube.com/watch?v=5O5R5MRCTH0&t=1865s

Does the FMA say VNAV PTH or ALT when passing T/D (late descent)?

Hardy Heinlin

VNAV ALT. Maybe the instructor refers to a very old FMC version from 1988 or so.

When you don't follow the predicted VNAV path but get caught in level flight at the MCP ALT, the mode changes to VNAV ALT. The long level flight segment after the T/D is not the predicted VNAV path but an MCP ALT capture.

ASCTU744

VNAV ALT does makes more sense, thx!