February 26, 200422 yr Currently on a flight from KSFO to KSLC.Cruise alt was set in the FMC & MCP at FL330, real time weather supplied by ActiveSky2.Once above about FL200 I left the a/p to get on with it and have just checked the flightdeck and got a surprise.The PFD was showing FL370 as was FS via SHIFT-Z. The MCP was still set at FL330 as was the cruise page of the FMC.Std pressure was set at FL180.Can anyone suggest why the 737-700 climbed to FL370 ?TIADave
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