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PERF/VNAV not available msg (Read 6703 times)
dc9man
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PERF/VNAV not available msg
Apr 12th, 2008 at 5:52pm
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After takeoff and after engaging the autopilot I select LNAV which works just fine then push the VNAV button and everytime I get a FMC message that says 'PERF/VNAV not available'. What am I doing wrong........................help!!!!!

                   Tom
  
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signmanbob
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Re: PERF/VNAV not available msg
Reply #1 - Apr 12th, 2008 at 10:08pm
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Are you sure you have all of the performance information loaded in the FMC/CDU correctly?  My VNAV works very well.
  
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w4fej
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Re: PERF/VNAV not available msg
Reply #2 - Apr 13th, 2008 at 12:39am
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Are you sure you haven't done something like put a 15000' crossing restriction 2-3 miles after takeoff?  If it can't hack the climb based on the route programmed it will barf on you .

  I have found MANY things wrong in the 757 package but the FMC system isn't one of them.  Programmed properly it works without error.  (so far)

  Mike B.
  
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dc9man
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Re: PERF/VNAV not available msg
Reply #3 - Apr 13th, 2008 at 5:33pm
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Thanks guys for the VNAV tips after being a little more meticulous with perf loading it finally worked for Ol' Tom, I appreciate it.

                Tom Smiley
  
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signmanbob
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Re: PERF/VNAV not available msg
Reply #4 - Apr 13th, 2008 at 6:16pm
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Glad to hear that you got your problem fixed Tom.
  
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fowler
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Re: PERF/VNAV not available msg
Reply #5 - Jun 1st, 2024 at 11:46am
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I haver the same issue and I have yet to discover where the issue is. I normally enter all required fields in the FMS prior to pushback and it works with the CS 767 all the time (I have never had this PERF/VNAV UNAVIALBLE message) Yet I do the same FMS setup in the CS 757III and I get these messages.
  
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