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Serious Problem - Autopilot not activatable

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    Serious Problem - Autopilot not activatable

    Hi,

    I experienced this the second time now and I think its a bug in the software.
    I'm flying the newest version of the NGXu under the newest version of P3D v5.1.

    This time I was not able to activate the AP after takeoff and during the whole rest of the flight.

    I tried everything I can think of.
    FD off and on again, All trimming should have been correct (pitch, roll and yaw), Different Autopilot modes, Joystick input is not present at time of AP engagement.

    I just click the AP button, I see the button is pressed, green light is lighting up as long as I keep it pressed, but when I release the button it does not leave it activated.

    Any ideas?
    It is very disappointing to prepare a flight for over an hour just to see that AP does not engage during flight forcing you to return to your departure airport.

    After this event I clicked State Panel Load NGX Cold and Dark at the gate to try it another time. Same thing happens again after takeoff.

    I closed the sim and did all the same again and then it worked without any problems as it usually does for 95% of the time.
    Maybe someone has experienced something similar?

    Thanks!

    Best regards Andreas Vavra

    #2
    Hi,

    a couple things coming to my mind here:
    Stab Trim Cutout Switches?
    Does the CWS Mode work?
    Does the FD work?
    Is the disengage bar up?

    Can you show a screenshot?

    Comment


      #3
      Calibration is another possibility. I went through a stage where I was trimming out the out of calibration. I didn’t have control ‘forces’, but the sim saw them.
      Mike Dryden
      GFO Janitor
      Retrieving lost & abandoned airframes

      Comment


        #4
        "Any ideas?
        It is very disappointing to prepare a flight for over an hour just to see that AP does not engage during flight forcing you to return to your departure airport."

        Hi Andreas, I'm sorry about your problem maybe due to, as Emi and Mike wrote, to a mistrimmed (or trim problem) condition or to a calibration problem (i.e. spike) anyway maybe you coluld continue your flight to your final destination by handflying the bird...

        In fact according with the B737 MMEL (master minimum equipment list) Rev. 60 system "22" (Autopilot) (page 60 sequence 01 B) is indicated that 0 autopilot can be operatives for dispatch IF Except for ER operations, may be
        inoperative provided:
        a) Approach minimums do not
        require their use,
        b) Enroute operations do not
        require autopilot use, and
        c) Number of flight segments and
        segment duration is acceptable
        to flightcrew.

        (I can also suppose that, regarding this full a/p failure, each airline has its own guidelines/operating procedures) and certainly maybe Emi and/or Alonso can well explain regarding the procedures to be applied..

        It happened to me once in the "Big Sim" a b738 fixed base trainer (now we can use a "full motion B738 sim, not certified) in the simulator center where I go: due to "wear and tar" of the electric parts the knobs of the MCP gave me wrong controls (i.e. in hdg mode turning the knob left caused the hdg increasing and the plane turning to the right ecc...) I had to disengage the A/Ps and handflying the bird to destination. Of course we're two "pilots" in that sim (I could use it alone but it's unrealistic and being two we can try to apply "crew coordination" and "sop" concepts)..the absurd think is that I performed my best flare and landing after that "handflown flight"...

        Best Regards
        Andrea Buono



        Andrea Buono - Como - I

        Comment


          #5
          And if all else fail as suggested above, delete and rebuild the panel state. It could be corrupted.
          André Hansson

          Comment


            #6
            Originally posted by Emi View Post
            Hi,

            a couple things coming to my mind here:
            Stab Trim Cutout Switches?
            Does the CWS Mode work?
            Does the FD work?
            Is the disengage bar up?

            Can you show a screenshot?
            I checked the cutout switches and flipped them a few times.

            CWS mode didnt work correctly during this incident. The plane banked strongly to the right when CWS was activated. Normally CWS is working fine for me!

            FD and A/T were working perfectly fine. I used them to return to EDDM.

            Disengage bar was up. I flipped it a few times though.

            Comment


              #7
              Originally posted by Mickel View Post
              Calibration is another possibility. I went through a stage where I was trimming out the out of calibration. I didn’t have control ‘forces’, but the sim saw them.
              That came also to my mind. I checked the controllers that had influence on yaw, pitch and rudder during the incidence. Setting the plane in Cold and Dark didnt help. Restarting P3D did help however. I did not change any settings before the restart of P3D.

              Comment


                #8
                Originally posted by AndreH View Post
                And if all else fail as suggested above, delete and rebuild the panel state. It could be corrupted.
                That shoulndt be the case. Just restarting P3D without changing anything helped.

                Comment


                  #9
                  Originally posted by Andrea1 View Post
                  "
                  Hi Andreas, I'm sorry about your problem maybe due to, as Emi and Mike wrote, to a mistrimmed (or trim problem) condition or to a calibration problem (i.e. spike) anyway maybe you coluld continue your flight to your final destination by handflying the bird...
                  That is good to know. The plane was flyable perfectly fine with handflying after FD bars. But I must admit that it was more fun to declare a Pan Pan Pan to return to Munich

                  Comment


                    #10
                    Priority because the autopilot doesn‘t engage?

                    i7-6700k, GTX 1080TI, 32GB DDR4 RAM @2666MHz, 4k
                    Marc Ehnle

                    Comment


                      #11
                      "The plane was flyable perfectly fine with handflying after FD bars".

                      Tje plane would be flyable also w/o FD bars..raw data..basic flying..pitch and power..using the ND for the heading reference ...a new challenge.. or maybe intercepting and following VOR radials like two decades ago...handflying with raw data is always possible..but very challenging...

                      Ciao
                      Andrea
                      Andrea Buono - Como - I

                      Comment


                        #12
                        Will do that when it happens the next time 😀

                        Comment

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