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dfish

VNAV

By dfish, in PMDG General Forum

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dfish    1

dfish
Posted

What does "PTH DES UNAVAILABLE" mean. After setting a lower alt, just before TOD, The aircraft goes into a '3000 desent at TOD and that Message appears in the FMC.Dave FisherCYYZ

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Guest cboyes   

Guest cboyes
Posted

Doesn't it mean that the aircraft isn't able to meet your next altitude constraint without exceeding a certain V/S. Can't remember offhand what the limit is but I think I've seen it mentioned here somewhere before.

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