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CAPTAIN SIM FORUM › 757 Captain › 757 version 4.x (FSX ONLY) › PERF/VNAV not available msg

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PERF/VNAV not available msg (Read 7077 times)

dc9man Full Member Offline Posts: 18 Location: Livingston, Montana USA Joined: Apr 10^th, 2008 Gender:	PERF/VNAV not available msg Apr 12^th, 2008 at 5:52pm	Print Post
	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 Senior Member Offline Posts: 274 Location: Alabama, USA Joined: Feb 1^st, 2008 Gender:	Re: PERF/VNAV not available msg Reply #1 - Apr 12^th, 2008 at 10:08pm	Print Post
	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 Full Member Offline Posts: 13 Joined: Nov 23^rd, 2006	Re: PERF/VNAV not available msg Reply #2 - Apr 13^th, 2008 at 12:39am	Print Post
	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 Full Member Offline Posts: 18 Location: Livingston, Montana USA Joined: Apr 10^th, 2008 Gender:	Re: PERF/VNAV not available msg Reply #3 - Apr 13^th, 2008 at 5:33pm	Print Post
	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


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signmanbob Senior Member Offline Posts: 274 Location: Alabama, USA Joined: Feb 1^st, 2008 Gender:	Re: PERF/VNAV not available msg Reply #4 - Apr 13^th, 2008 at 6:16pm	Print Post
	Glad to hear that you got your problem fixed Tom.


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fowler Full Member Offline Posts: 80 Joined: Oct 31^st, 2009	Re: PERF/VNAV not available msg Reply #5 - Jun 1^st, 2024 at 11:46am	Print Post
	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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