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Autopilot Not Engaging After Takeoff

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    Autopilot Not Engaging After Takeoff

    Hi,

    Just reinstalled Windows + P3D v5 + 737 NGXu:

    I am now finding that the autopilot will not engage after takeoff. I have to make several attempts at engaging it, & it finally engages several minutes after takeoff.

    I did not have this issue with the previous installation. Any thoughts, please?
    Doug Boynton

    #2
    What exactly is happening when you try to engage it. Also, do you have your controls centered prior to engaging it.
    Captain Kevin

    Kevin Yang

    Comment


      #3
      Originally posted by Captain Kevin View Post
      What exactly is happening when you try to engage it. Also, do you have your controls centered prior to engaging it.
      When I select 'CMD' mode on either autopilot, the pushbutton depresses, then pops out again, with no engaged light illuminated & PFD still showing 'FD'. After several attempts, I see the engaged light illuminate for a fraction of a second, before disappearing again. After several attempts/minutes, the autopilot finally engages.

      I have tried engaging in the climb (after flaps up) & in straight & level flight. In each case the aircraft symbol is correctly straddling both FD bars, with no control input.

      Don't recall having this issue with the previous installation with the same versions of P3D & the NGXu.
      Doug Boynton

      Comment


        #4
        Originally posted by Skyrider View Post

        When I select 'CMD' mode on either autopilot, the pushbutton depresses, then pops out again, with no engaged light illuminated & PFD still showing 'FD'. After several attempts, I see the engaged light illuminate for a fraction of a second, before disappearing again. After several attempts/minutes, the autopilot finally engages.

        I have tried engaging in the climb (after flaps up) & in straight & level flight. In each case the aircraft symbol is correctly straddling both FD bars, with no control input.

        Don't recall having this issue with the previous installation with the same versions of P3D & the NGXu.

        Maybe there is some "noise" in your controllers that is interfering?

        Long shot, but easy to test...try turning off the "realistic autopilot engagement" option in the Simulation settings. If the autopilot starts engaging consistently again you'll know that was the cause.
        Matt Smith

        Comment


          #5
          Originally posted by MattS View Post


          Maybe there is some "noise" in your controllers that is interfering?

          Long shot, but easy to test...try turning off the "realistic autopilot engagement" option in the Simulation settings. If the autopilot starts engaging consistently again you'll know that was the cause.
          Hi Matt,

          Long shot or not, it worked! Can't see any reason why the AP was not engaging before. Maybe that option should be renamed 'Unrealistic autopilot engagement'? 😉
          Doug Boynton

          Comment


            #6
            Originally posted by Skyrider View Post

            Hi Matt,

            Long shot or not, it worked! Can't see any reason why the AP was not engaging before. Maybe that option should be renamed 'Unrealistic autopilot engagement'? 😉
            Not at all. It is realistic for the A/P to not engage if the controls are not neutralized (no control forces applied). In your case, you are applying a control force whether you realize it or not. Did you recalibrate your controllers after the reinstallations?
            Dan Downs KCRP
            i7-10700K 32GB 3600MHz 2080Ti

            Comment


              #7
              Originally posted by DDowns View Post

              Not at all. It is realistic for the A/P to not engage if the controls are not neutralized (no control forces applied). In your case, you are applying a control force whether you realize it or not. Did you recalibrate your controllers after the reinstallations?
              Yes, I'm aware of the requirements for autopilot engagement.

              In this case, not using any controllers, just a keyboard.
              Last edited by Skyrider; 04May2021, 14:40.
              Doug Boynton

              Comment


                #8
                Originally posted by Skyrider View Post

                Not using any controllers, just a keyboard.
                Ok THAT‘s uncommon and most likely the problem. I suppose your yoke is not centered. How would you know it is when all you can do is tap it back and forth with the keyboard? You can hardly call it unrealistic if you don‘t even meet the minimum requirements (three axes controller)
                i7-6700k, GTX 1080TI, 32GB DDR4 RAM @2666MHz, 4k
                Marc Ehnle

                Comment


                  #9
                  Originally posted by Ephedrin View Post

                  Ok THAT‘s uncommon and most likely the problem. I suppose your yoke is not centered. How would you know it is when all you can do is tap it back and forth with the keyboard? You can hardly call it unrealistic if you don‘t even meet the minimum requirements (three axes controller)
                  That's good thinking. However, there are no inputs in pitch or roll, the attitude is not changing, the aircraft is in trim, following the flight director commands. I've never used an external controller, only ever used the keyboard & it used to work okay with previous installations 🤔
                  Doug Boynton

                  Comment


                    #10
                    Originally posted by Skyrider View Post

                    That's good thinking. However, there are no inputs in pitch or roll, the attitude is not changing, the aircraft is in trim, following the flight director commands. I've never used an external controller, only ever used the keyboard & it used to work okay with previous installations 🤔
                    Just wondering, purely out of personal interest, how do you know the airplane is on trim?
                    When you change the position of the yoke of the elevator trim, since you have zero feedback and both work the same way, how can you tell that you are not for example counteracting a positive control input by trimming?

                    Comment


                      #11
                      Originally posted by Emi View Post

                      Just wondering, purely out of personal interest, how do you know the airplane is on trim?
                      When you change the position of the yoke of the elevator trim, since you have zero feedback and both work the same way, how can you tell that you are not for example counteracting a positive control input by trimming?
                      By trimming the stabiliser until I can maintain the desired attitude with the elevator at the neutral position, as shown on the flight control surface position indicator on the lower DU.

                      This is only required for the initial engagement: once the autopilot is engaged, it looks after the stabiliser trim automatically.
                      Last edited by Skyrider; 04May2021, 15:22.
                      Doug Boynton

                      Comment


                        #12
                        Originally posted by Skyrider View Post

                        By trimming the stabiliser until I can maintain the desired attitude with the elevator at the neutral position, as shown on the flight control surface position indicator on the lower DU.

                        This is only required for the initial engagement: once the autopilot is engaged, it looks after the stabiliser trim automatically.
                        But there might still be a small deflection, too little for the indication to show.

                        Comment


                          #13
                          Originally posted by Emi View Post

                          But there might still be a small deflection, too little for the indication to show.
                          Yes, that could be the case. Hard to know how accurate the indicator is, & how strictly the engagement criteria are modelled.
                          Doug Boynton

                          Comment

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