Are there any solutions to the "UNABLE CRUZ FLT" and "VNAV DISCONNECTED" problem yet. I get it every time I take off.

HiI would really take a close look on the flight planning/FMC programming phase. I have made several flight on VNAV and never had any trouble. Check your weight, if you're heavy you can't climb to FL410 for example. I think you get the "VNAV DISCONNECT" when the FMS no longer can uphold the VNAV profile. You have something not aligned in your flight profile. Please provide us with some screen shots and other useful data and I'm sure some of the talanted guys can help you out!Hope it helps,

>Are there any solutions to the "UNABLE CRUZ FLT" and "VNAV>DISCONNECTED" problem yet. >>I get it every time I take off.Just one suggestion. Are you remembering to arm the autothrust system?I forgot to do that on one flight and had precisely the same symptoms.Mike

Hiplase see the thread "VNAV trouble shooting" - I included a complete valid flight plan (post #15), where (I think so) this problem can be reproduced - and I would be glad to get *any* response.HansJuergen

I will take screenshots nextt time I fly but:The plane was only half loaded with 9000lbs of fuel and a cruise set for FL250 so I don't think that is the problem.FMC's I have been programming for several years now.

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Sorry, my apologiesJohn Graddon

Had the same problem but when I removed the old flightplans from PMDG flightplan folder (the ones created before the update) and created new ones it all seems to work fineHope it will helpClaes Johansson