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FMC and altitude


Robin Meads
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Robin Meads
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Good morning.

I have set up the FMC with speed/alts as per AIP and there are no discontinuities.

After takeoff I set the AP and it successfully follows the waypoints (altho it does lose them later, but that is another problem). My question here is why does the Xplane default 737-800 not keep to the FMC defined altitudes ? I set the main track at 8000 ft, but it climbs to over FL20. I have tried setting the required alt on the longer distance waypoint to 8000B, but it still climbs and does descend when it gets to or near to the waypoint. Any thoughts gratefully received.

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Robert Fersch
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Check that you have a vertical mode selected on the autopilot. VNAV, FLCH, Altitude Hold.

iflycapBOB.jpg
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Robin Meads
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Thanks Robert

I had both VNAV and LNAV on. It followed LNAV, but ignore VNAV

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