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737 hardly reach cruising altitude and speed

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    737 hardly reach cruising altitude and speed

    Dear Members,

    I am new to the Boeing world, having only flown Airbus. After a couple of tutorial videos I started my first flight on my own today. I'm trying to find out why the plane can't reach the speed and altitude I've set. I attach some pictures of the settings I took at the time. Anyone who knows the answer please help me with what I am doing wrong.

    Thank you very much.

    Regards,

    Márton
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    This gallery has 3 photos.

    #2
    Well does the Airbus do coupled VNAV with the a/t off? Nope. Neither do Boeings. I suggest tutorial and manual.

    Comment


      #3
      PS. You also can’t have auto throttle for speed at cruise unless the a/t is turned on. Boeing’s are dumb that way.

      Comment


        #4
        As Mark mentioned, you need to turn the autothrottle on (that's the little toggle switch between the Course and Speed windows on the MCP in your second screenshot). Once you turn that on, you will be able to select the "Speed" autothrottle mode to maintain the speed that you set on the MCP, or "VNAV" (if you have properly set up the flight plan in the FMC).

        If you are climbing with the autothrottle turned on, you can use either "VNAV" where the autopilot will fly the speed and vertical profile that it computed based on what you entered in the FMC, or "LVL CHG" where the autothrottle will set the throttles to maximum, and the autopilot will adjust pitch to maintain the speed that you have set in the MCP. Be careful when using LVL CHG though, because you can get some really fast climbs if the aircraft is light.

        In a descent, LVL CHG works the opposite: The autothrottle will bring the engines to idle power, then the autopilot will adjust pitch to maintain the speed that you set in the MCP.

        There are some significant differences between Boeing and Airbus in terms of how you interact with the automation, but once you get the hang of it it isn't that bad.
        Tim Lincoln
        My YouTube Channel

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        • Crabby
          Crabby commented
          Editing a comment
          However, I was not as eloquent. LOL

        #5
        Thanks for all answers! I forgot to turn it on, but on the way I realised it wasn't on. Later then I successfully landed on my destination airport. Thank you again. This topic answered and the problem solved.

        Comment


          #6
          Originally posted by Want2BFlyin View Post
          As Mark mentioned, you need to turn the autothrottle on (that's the little toggle switch between the Course and Speed windows on the MCP in your second screenshot). Once you turn that on, you will be able to select the "Speed" autothrottle mode to maintain the speed that you set on the MCP, or "VNAV" (if you have properly set up the flight plan in the FMC).

          If you are climbing with the autothrottle turned on, you can use either "VNAV" where the autopilot will fly the speed and vertical profile that it computed based on what you entered in the FMC, or "LVL CHG" where the autothrottle will set the throttles to maximum, and the autopilot will adjust pitch to maintain the speed that you have set in the MCP. Be careful when using LVL CHG though, because you can get some really fast climbs if the aircraft is light.

          In a descent, LVL CHG works the opposite: The autothrottle will bring the engines to idle power, then the autopilot will adjust pitch to maintain the speed that you set in the MCP.

          There are some significant differences between Boeing and Airbus in terms of how you interact with the automation, but once you get the hang of it it isn't that bad.
          Thank you! This was useful information on the difference between the two.

          Comment


            #7
            Originally posted by Crabby View Post
            Well does the Airbus do coupled VNAV with the a/t off? Nope. Neither do Boeings. I suggest tutorial and manual.
            Thank you, I figured out later then. Just a little thing 😆

            Comment


              #8
              I forgot to mention using V/S or Vertical Speed when climbing/descending. This mode would be used in conjunction with the Speed mode for the autothrottles. The autothrottle system will adjust the power to maintain the speed that you set in the MCP, and the autopilot will adjust the pitch to maintain the vertical speed that you set in the MCP. I believe that vertical speed will be prioritized, so it is possible to get very close to stall speed or maximum operating speed if you aren't careful.
              Tim Lincoln
              My YouTube Channel

              Comment

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