Hi,I have installed the service pack for fs2002, but now I can't engage the VNAV, when I push the button, and in the FMC appears the following message : "UNABLE CRZ ALT". I used the FL250 from LGAV to LGRP about 250miles. So there are "zero" estimated fuel quantity at some waypoint until arrival airport in the PROG page.Thank you very muchFriendlyPaul

Hi Paul,Seems like something in your FMC setup is wrong, please check to ensure you have set-up everything correctly. Could you send some further details and I will see if I can help?George

Hidouble click on the first waypoint to "reload" it again and now VNAV should have any problem to engagecoimbra

Hi George,I send you some further details from my fmc set up. I want to information you that I have 2.97 version of Fsuipc. The route is LGAV-LGRP (259miles). Look at the photo.It is entering automatically altitude until waypoint RIPLI (315/FL250), from this waypoint and down no entering speed/altitude. Thank you very muchFriendly Paul

Are you getting this message on the ground or in climb? Once you set your CRZ Alt, the FMC always calulates the PATH alts unless you input something different. Is there a reason your MCP is set to 10000'? If your TOC is too close to your TOD you will get this message...[h5]Best Wishes,Randy J. Smith [h4]P M D G 7 3 7 NG[/h4] [h3] Realism on the horizon [h5]AMD XP 2200 |MUNCHKIN 512 DDR RAM |ECS[/b ][i] K7S5A MB[/i] |GF2 MX 32 MEG and still runs GOOD!|WIN XP PRO |MITSUBISHI DIAMOND PLUS 91 19"[/h5]

Hi Randy,I getting this message in the climb,but I think understand something about this problem. When the half waypoints in the legs page don't put the speed/altitude restriction than I have this message when I push the VNAV button. Look at the photo that I have send the previus message and you understand. Thank you for the help you Friendly Paul