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dfish

VNAV PTH Descent

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I'm having trouble with VNAV descent. I'll be in cruise at, say, FL320. Just before TOD I enter a lower alt. in the MCP, but when I cross TOD the aircraft fails to descend and I get a message "PTH DES UNAVAILABLE" in the FMC scratch pad. Any idea what I'm doing wrong. On the -400 I use the same method and the aircraft will descend, following the alt. and speed restrictions.Dave F.

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Yup, you need to place at least one altitude restriction otherwise what path is it going to follow?

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I had a STAR programed with altitude restrictions showing on the legs page. I must be doing something wrong. I'll scan the manuals again.Thank's anyway,Dave F.

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