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Question about altitude

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    Question about altitude

    I setup a flight and set the curse altitude 6000 in the overhead panel as well as the landing. However I forgot to change it in the MPC and it was 10000. When I used VNAV the 737 reach 6000 and leveled off. Does the overhead take priority over the MCP.

    never mind I set 6000 in the FMC and that is what vnav uses
    Last edited by dsalman1; 26May2023, 23:09.
    Dean Salman

    The autopilot will use what is set in the FMC and on the MCP during cruise these should be the same). The altitude set on the overhead panel is for the pressurization system. The overhead setting has nothing to do with the altitude at which the autopilot will attempt to fly the aircraft. The aircraft will, however, complain if you don't cruise at the altitude that is set in the overhead panel.
    Tim Lincoln
    My YouTube Channel


      I forgot to set the MPC so it was at 10000 where as the FMC was set too 6000. So that is what it used. I dont usually do that and they are the same but it was a quick test flight
      Dean Salman


        That is exactly correct. If you set 6,000 feet in the FMC and leave the MCP set to 10,000, then the autopilot will climb to 6,000 feet and cruise at that altitude (if you are in VNAV). It will just be wondering the whole time why you have 10,000 set in the MCP.

        If you do the opposite, so set 10,000 in the FMC and set the MCP to 6,000, the aircraft will climb to 6,000 feet and level off, then wonder when you will allow it to continue to climb to 10,000.

        If you are in a VNAV climb, then the autopilot will climb to whichever altitude is the lowest between the FMC and MCP. In a VNAV descent, the autopilot will descend to whichever altitude is highest between the FMC and MCP.
        Tim Lincoln
        My YouTube Channel


          That is all explained in the FCOM. Try to find yourself an FCOM to see what the pressurization panel does (pressurization) and what the MCP or the FMC does (navigation).
          Omar Josef
          737 FO
          757/767 rated