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Auto throttle issue after last update

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    Auto throttle issue after last update

    Hello,

    After updating to version 30.0.44, Im having issues with the auto throttles engaged in MCP SPD or FMC SPD. If speed drops just a knot or two less than the commanded speed, the auto throttle increases N1 to between 75 and 80. There is then a rapid acceleration to approximately 20 knots above the magenta bug on the speed tape. Thrust then decreases to idle and speed decreases towards commanded speed. This will repeat it self again should the actual speed drop below the magenta bug by any amount. I did not have this issue prior to the latest update. Flown three flights with the update, and all three flights had the same issue.

    Dean Cole

    #2
    I do not know if it is a failure. But if it is, I have the same error. Since the last update, it is no longer possible for my aircraft to maintain the desired speed.


    I set 248ktn, the plane throttles down to 246 and then gives full thrust. Something 20ktn above the set 248ktn.

    Speed drops again, aircraft accelerates again. This happens infinitely often


    Sven Telljohann

    Comment


      #3
      Had this exact issue tonight on flight SLC-SEA ..only happened during decent and approach phases. occurs using both vnav and selected speed.
      Last edited by psimmons4; 03Nov2022, 10:21.
      Philip Simmons

      Comment


        #4
        Are you using FSRealistic? During testing I found that it can cause some pretty serious issues as it changes the MSFS atmosphere. Removed it and it worked perfectly again.

        Comment


        • psimmons4
          psimmons4 commented
          Editing a comment
          excellent point, thanks for the insight. I am using FSRealistic. Never had an issue before but will defintely test tomorrow.

          Phil

        • BaxterChico
          BaxterChico commented
          Editing a comment
          I don't have FSrealistic on. And I have encountered this problem.
          Last edited by BaxterChico; 03Nov2022, 10:37.

        • phatcat213
          phatcat213 commented
          Editing a comment
          Thank You for the post. I just turned it off for PMDG flights and now tings work great. I was on a 4 hour flight and two thirds of way through things went crazy and i couldn't find a solution. Now I have one. Thank you again this worked like a charm.

        #5
        Hi

        I'd like to report AT issues too. No FSR installed.

        I did a test flight just now and found out (so far) that:

        1. During climbing using FLCH and maintian 250 knot (3500ish fpm VS) then switch to VS and reduce to 1500 fpm VS, throttle stayed until IAS reach 260+ knots then started to move back.
        2. Upon reach target altitude using VS mode, once vertical mode chaged from VS to ALT ACQ, the throttle roughly moved forward and then back.
        3. During approach with AP on, the AT was unable to maintain selected IAS (always 10+ knots away from selected IAS) and kept moving foward and back.
        Bai Jian

        Comment


        • Crabby
          Crabby commented
          Editing a comment
          1. without knowing your speed settings on the MCP this means nothing. 260+ knots is not a setting. If you are in anything other than VNAV you have to manage the speed/mach number in the window.
          2. If you were climbing at a speed lower than the calculated climb speed (for example 0.75M and calculated cruise is 0.79) then this be normal as the airplane wants to capture the correct speed, then engines slow to maintain.
          3. Wind will cause this to occur in the sim and in real life.

          Need more info and a video would be best.

        #6
        I have made a video where you can see the problem quite well.

        Here it is not an external tool, what accesses the A/T. This happens with and without FS Realistic.
        Also Pro-ATC has nothing to do with the inputs. I could exclude this in a total of 4 test flights.


        I hope that this problem can be solved quickly.​ https://youtu.be/OnuTgvHr0VY
        Sven Telljohann

        Comment


          #7
          Hi everybody!

          Reporting the same issue.... Happened twice (made 2 flights), and it happens during Descend... when speed restrictions of 240kts is in place.

          Warm regards,

          Rafael A. Reca
          Buenos Aires, Argentina
          Rafael A. Reca
          Buenos Aires, Argentina

          Comment


            #8
            I have experienced this same issue. Level at 4000, MCP speed set to 180, flaps 5. Aircraft decelerates to about 175, auto-throttle advances to approx. 80% N1, aircraft accelerates to approx 210, auto-throttle reduces to idle, airspeed drops to about 175, auto-throttle advances to approx. 80% N1 ... ad infinitum. (stock sim).
            Last edited by PositiveZero; 03Nov2022, 15:15.
            Charles Vomacka

            Comment


              #9
              I have the exact same problem!! (Stock sim)

              Comment


                #10
                By coincidence, anybody is using AIGround and AIFlow as well? Those 2 programs are available at Flightsim.to and manages AI Traffic via SimConnect....

                Thank you!

                Rafael A. Reca
                Rafael A. Reca
                Buenos Aires, Argentina

                Comment


                  #11
                  Hi All,

                  I have the same issue.

                  Happy Landings!
                  KR, Ehmjo

                  Comment


                    #12
                    And I will confirm I have the same issue. No other add-ons, no FSR, no AI, just me. It happened on descent as I was slowing to meet a 250 kt speed restriction going in to KIAD on the CAVLR STAR. Live weather, but only modest crosswind. LNAV/VNAV guidance on AP. I'm running SU 10.
                    John Wiesenfeld - KPBI
                    PPL/IFR, VATSIM C1 (ZNY)

                    Comment


                      #13
                      Had the same problem as well..
                      Michel Jobe - ATCO ret. - EBBR

                      Comment


                        #14
                        I had the same issue performing a flight from KBUR to KSJC today.
                        I am NOT using any addons--just the stock simulator with its live weather.

                        The auto throttle was erratic and especially on descent when there was a 250 knot restriction, N1 went to 90%. I shut off the auto throttle and tried to manage the speed manually. A few moments later, I turned on the AT and it went ballistic. Even when I set the speed in the MCP to 250 knots, it didn't respond.

                        Yes, I did a reset of the AT, the Flight Directors and the autopilot, but none of that helped.

                        The rest of the flight was performed manually and I did manage to perform a safe landing at KSJC.

                        On another note....not a PMDG issue but an ASOBO issue...
                        Before my flight, I check the weather using Aviation Center Weather website to check the winds aloft and turbulence. The winds were coming from the north about 320 degrees around 90 knots.
                        I use Simbrief for my flight plan and when I expanded the route chart to look at the winds, it agreed 100% with the aviation forecast.
                        When I passed the COREZ waypoint, the wind did a violent shift to 270 degrees within milliseconds. My aircraft did a violent roll to the right and all hell broke loose. All the bells and whistles went off and I took manual control. Mind you, there were no winds coming from 270 degrees at FL360.

                        I ran into this behavior during the FSX days before Active Sky came into play.

                        All I can say is that I am mentally exhausted from this flight. There was so much going on and with no co-pilot to help I need to take a long break. 😁





                        Bob Fresco

                        Comment


                          #15
                          I can confirm same A/T issue with two separate flights. The good news is I have had good opportunity to practice missed approach procedures.
                          Dustin Moss

                          Comment


                            #16
                            BTW, our friend Emi is currently on YT demonstrating the new update and he has repeatedly run into the same AT problem on descent as has been reported here. He said he would report it to the PMDG team.

                            Cheers.
                            John Wiesenfeld - KPBI
                            PPL/IFR, VATSIM C1 (ZNY)

                            Comment


                              #17
                              Flaps 40, Vref 144, Autoland FAIL OP....AT held consistently around 154, could not slow it down even with speedbrake, that just trigger more power. No add-ons, 737-800 PAX. The only time I saw AT improvement was holding 250 on climbout, it was worse than the previous version in all other regimes.
                              Mike Murphy
                              Commercial, Instrument, Rotorcraft-Helicopter

                              Comment


                                #18
                                Do you guys report this via ticket? The devs are not always monitoring the forums.
                                Klaus Schmitzer

                                Comment


                                  #19
                                  There is no need for ticket we are aware and under investigation
                                  Chris Makris (Olympic260)
                                  PMDG Technical Support
                                  http://www.pmdg.com

                                  Comment


                                    #20
                                    I did a flight this morning from Huntington, WV, to Charlotte, NC, using the FMS. The autothrust did not disengage when I turned off the autopilot near the Charlotte airport. I've flown this flight dozens of times under these exact conditions and FMS plan. I don't know whether it's the PMDG update or my SU11 beta. But something is different. I did notice, however, that the bobbing up and down of the 737 was better. It's still present and annoying, but there's definite improvement.
                                    David Mills
                                    Huntington, WV

                                    Comment


                                    • Aeromar
                                      Aeromar commented
                                      Editing a comment
                                      The autothrottle is not supposed to disengage when you disengage the autopilot. You have to disengage it yourself. Make sure you have an controller assignment for that and, just like when disengaging the autopilot, the first click does the job and the second click shuts it up.

                                    #21
                                    I can report the same problem and no FSRealistic. On decent and speed continually went up and down on AT. Never happened with previous updates.
                                    Rudy Fattal

                                    Comment


                                      #22
                                      Have the same issue
                                      ADSMarinho

                                      Comment


                                        #23
                                        Add me to the list, first flight, AT bugged.
                                        Sergio Naiberg

                                        Comment


                                          #24
                                          Same issue here in descent yesterday. And as i flew a second route without loading a new flight, the issue persists for the whole flight, from climb to descent.
                                          Regards from EDKF,
                                          Markus Hardt

                                          Comment


                                            #25
                                            same issue here, plus unable to respect altitude constraint, and during approach with a medium cross wind plane goes left to right strongly, never saw that plane fly like an AS plane since i flew it
                                            Frédéric Giraud

                                            Comment


                                              #26
                                              Same issue with me and FSR turned off.
                                              Dan Schneider
                                              ATP B737 CL-65

                                              Comment


                                                #27
                                                yepp same here.... will we have to wait 18 days for an update or it could come sooner as a hotfix ?

                                                Cheers
                                                Miguel de Gonzalo

                                                Comment


                                                  #28
                                                  Autothrottle messed up here as well, hope to get hotfix soon, aircraft is unflyable with AP on approach..
                                                  Teofilo Homsany

                                                  Comment


                                                    #29
                                                    HotFix required!!!

                                                    Back to Fenix i guess ....

                                                    Comment


                                                    • Boeing 25-01
                                                      Boeing 25-01 commented
                                                      Editing a comment
                                                      Crabby same for me. Parking the NG in the hangar until they get these issues sorted out. I want to enjoy my sim, so I will fly an aircraft that more correctly simulates the model.

                                                    • Crabby
                                                      Crabby commented
                                                      Editing a comment
                                                      That's just terrible. I sure hope PMDG learn their lesson.

                                                    • Boeing 25-01
                                                      Boeing 25-01 commented
                                                      Editing a comment
                                                      From Crabbys mouth to their ears...

                                                    #30
                                                    Hotfixxxxxx
                                                    Miguel de Gonzalo

                                                    Comment


                                                    • Crabby
                                                      Crabby commented
                                                      Editing a comment
                                                      The correct term is Hotchixxxxxx.
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