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Autodeployment speedbrakes upon touch down

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    Autodeployment speedbrakes upon touch down

    Hi guys,

    I noticed that on the -400 it seems that the speedbrakes deploy with quite some delay. On the -8 the deployment happens instantly as the weight comes on the main gear wheels. On the -400 it appears that it is triggered by activating the reversers, which would be normal when speedbrakes are not armed. When they are armed for landing, and they should, they should deploy as soon as thrust levers are idle and the main gears touch down. This seems not to be the case in the current version. Anyone else noticed this? Could not find any other topic regarding this. I know however that a buddy of mine has the same issue.

    Kind Regards,

    Harm Swinkels
    Kind Regards,

    Harm Swinkels

    PMDG 747/747/737/777

    #2
    Can't say I've ever noticed this. That said, engines completely at idle power?
    Captain Kevin

    Kevin Yang

    Comment


      #3
      Yes, engines completely idle. The issue does not occur on the -8, so the engines not being idle can not be the issue u think. On the -8, the speedbrakes deploy as soon as the wheels touch and before i get the chance to open the thrust reversers. On the -400 the speedbrake only deploys as soon as i open the reversers, which is a little later than touch down because i do not touch the reverse levers before the main gear has touched down.

      Kind Regards,

      Harm Swinkels
      Kind Regards,

      Harm Swinkels

      PMDG 747/747/737/777

      Comment


        #4
        Does your B744 do this when you autoland?

        I'm not having any problems with the B744, but I'm old and easily confused. ROFL.
        Bode Bridges

        Beta Tester XM-22/26 TOW

        Comment


          #5
          Is your speed breaks armed?


          Anthony Miller

          Comment


            #6
            Originally posted by Bluestar View Post
            Does your B744 do this when you autoland?

            I'm not having any problems with the B744, but I'm old and easily confused. ROFL.
            Affirm, no differences between manual landings with or without A/T engaged, same for autolands. Just did another test, autoland with A/T engaged and not touching the reversers at all during the entire rollout. Same delay.
            It is not a very big deal, but there is a noticable delay between touchdown and the movement of the speedbrake lever, about almost a second or so. Deployment should be instant and on the -8 it indeed is instant. I am seeing it also in all PMDG 747-400 videos i have found so far on youtube. You hear the ground roll sound, you hear some clicking noises and then after almost a second you hear the speedbrake lever servo sound. It may seem nitpicky on a small detail, but the small details are what makes this my favorite addon, besides the 747 being my favorite aircraft , and therefore it started to bother me lately .

            Kind Regards,

            Harm Swinkels
            Kind Regards,

            Harm Swinkels

            PMDG 747/747/737/777

            Comment


              #7
              Originally posted by Heffron View Post

              Affirm, no differences between manual landings with or without A/T engaged, same for autolands. Just did another test, autoland with A/T engaged and not touching the reversers at all during the entire rollout. Same delay.
              It is not a very big deal, but there is a noticable delay between touchdown and the movement of the speedbrake lever, about almost a second or so. Deployment should be instant and on the -8 it indeed is instant. I am seeing it also in all PMDG 747-400 videos i have found so far on youtube. You hear the ground roll sound, you hear some clicking noises and then after almost a second you hear the speedbrake lever servo sound. It may seem nitpicky on a small detail, but the small details are what makes this my favorite addon, besides the 747 being my favorite aircraft , and therefore it started to bother me lately .

              Kind Regards,

              Harm Swinkels
              Harm, if you have some solid evidence such as Boeing documentation to back your observation then please submit that to PMDG Product Support. There are several very high time B744 pilots on the tech team that I don't recall raising this issue but if you got the supporting technicals then that will be appreciated.
              Dan Downs KCRP

              Comment


                #8
                Originally posted by Heffron View Post
                Hi guys,

                I noticed that on the -400 it seems that the speedbrakes deploy with quite some delay. On the -8 the deployment happens instantly as the weight comes on the main gear wheels. On the -400 it appears that it is triggered by activating the reversers, which would be normal when speedbrakes are not armed. When they are armed for landing, and they should, they should deploy as soon as thrust levers are idle and the main gears touch down. This seems not to be the case in the current version. Anyone else noticed this? Could not find any other topic regarding this. I know however that a buddy of mine has the same issue.

                Kind Regards,

                Harm Swinkels
                As far as the normal Speedbrake operation and flight deck indications are concerned during the flare and landing, there is no noticeable difference between the B744 and B747-8. In both cases, when the Speedbrake lever is in the ARM position and provided the Thrust Levers 1 and 3 are near the idle position; then as the main landing gear touches down the Speedbrake lever will be driven to the UP position, extending all of the spoiler panels.

                The Speedbrake lever is also driven to the UP position from the DN position when the main gears are on the ground, Thrust levers 1 and 3 are near the idle position, AND Reverse Thrust levers 2 or 4 are pulled up to the idle detent. This automatic ground spoiler extension also works as a backup for landing if the Speedbrake lever is not armed during the approach.
                Michael Codd

                Comment


                  #9
                  Originally posted by Michael Codd View Post
                  As far as the normal Speedbrake operation and flight deck indications are concerned during the flare and landing, there is no noticeable difference between the B744 and B747-8. In both cases, when the Speedbrake lever is in the ARM position and provided the Thrust Levers 1 and 3 are near the idle position; then as the main landing gear touches down the Speedbrake lever will be driven to the UP position, extending all of the spoiler panels.

                  The Speedbrake lever is also driven to the UP position from the DN position when the main gears are on the ground, Thrust levers 1 and 3 are near the idle position, AND Reverse Thrust levers 2 or 4 are pulled up to the idle detent. This automatic ground spoiler extension also works as a backup for landing if the Speedbrake lever is not armed during the approach.
                  Yes, i too can read the FCOM. Support ticket was opened, issue has been reported before and is being looked into by the devs.

                  Kind Regards,

                  Harm Swinkels
                  Kind Regards,

                  Harm Swinkels

                  PMDG 747/747/737/777

                  Comment


                  • Michael Codd
                    Michael Codd commented
                    Editing a comment
                    Glad to be of help. You would be surprised how many users don't bother to read the manuals and similar forum posts first - and still don't understand what they all mean when they do!
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