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Am I the only person feeling the autobrake weak?

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    Am I the only person feeling the autobrake weak?

    As title says…
    By Guilherme P. Wish you all the best!

    #2
    I’ve been thinking this…had my autobrakes set to 2 and it took up the full length of the runway at EGCC to stop, I had to put some manual breaking in too before I ended up running off the edge!

    Spoilers were up, reverse thrust was active, aircraft wasn’t heavy, definitely feels weak
    Tom Berry

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      #3
      I'm willing to bet they are correctly modeled. Also remember, after you reach about 60kts stow the reversers and apply manual breaks. You're not supposed to go to full stop on autobreaks alone.
      André Hansson

      Comment


        #4
        Sounds about right. When the NGXu came out one of the 737 pilots said (quoted freely):

        1 warms the brakes
        2 brakes the plane a bit but never enough
        3 is a good number to use all the time
        4 will bring the trolleys to the cockpit
        Max your pax will agree that the pilots are insane.
        Last edited by Ephedrin; 14May2022, 08:09.
        Ryzen 9 5900X, RX 6900XT, 32GB DDR4 RAM @3600MHz, 4k
        Marc Eland
        GFO Beta

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          #5
          There are more reports of no autobrakes during landing.
          It has been brought to the attention of the developers.
          Note, we did not have this issue during the beta, so maybe SU9 or hotfix broke something.
          René Moelaert EHLE

          Comment


          • Ephedrin
            Ephedrin commented
            Editing a comment
            Good to know, thanks.

          #6
          Tried out myself another time.
          RTO normal.
          Circuit EHAM RW27 AB 2 no reverse, normal deceleration.
          This will be a difficult one to solve.
          René Moelaert EHLE

          Comment


            #7
            Yea when I use autobrakes 2 it seems very weak.
            Clément Hernandez

            Comment


              #8
              Originally posted by iFlySimX View Post
              Yea when I use autobrakes 2 it seems very weak.
              The autobrakes are weak on the 737 New Generation (different thing on the Classics). On a long, dry runway you can use autobrake 2. On short runways, even autobrake MAX is sometimes used.

              Comment


                #9
                I can confirm that this was one of my first observations when testing the 737 the first couple of times. I actually took it on a couple of approaches to KMDW using autobrake 2 and it literally took the entire length of the runway to get down to 80kts..........all while using reverse and spoilers deployed. I used to fly E3's for the USAF/NATO back in the day and we were always instructed to not tap the brakes until you're down to 80kts or risked crystalizing the brakes. On the NG's however, I found this piece of info..........

                There is an "on ramp" period where autobrake pressure is applied over a period of time. Approximately 750psi is applied in 1.75 sec, then the pressures above are reached in another 1.25sec for autobrakes 1, 2, or 3 and approx. 1.0 sec for autobrake MAX.

                Notice that autobrake Max does not give full brake pressure. For absolute maximum braking on landing, select autobrake Max to assure immediate application after touch down then override with full toe brake pressure. Using high autobrake settings with idle reverse is particularly hard on the brakes as they will be working for the given deceleration rate without the assistance of full reverse thrust.

                To cancel the autobrake on the landing roll with toe brakes you must apply a brake pressure in excess of 800psi (ie less than that required for autobrake 1). This is more difficult on the NG's because the feedback springs on the brake pedals are stiffer. Autobrake can also be cancelled by putting the speedbrake lever down or by switching the autobrake off. I would advise against the latter in case you accidentally select RTO and get the full 3000psi of braking!

                Occasionally you may see the brakes (rather than the cabin crew!) smoking during a turnaround. This may be due to hard braking at high landing weights. But the most common reason is that too much grease is put on the axle at wheel change so that when the wheel is pushed on, the grease is deposited inside the torque tube; when this gets hot, it smokes. It could also be contamination from hydraulic fluid either from bleeding operation or a leak either from the brakes or another source.

                Source: http://www.b737.org.uk/landinggear.htm

                Hope this helps!
                Last edited by DMullert; 14May2022, 13:51.
                Sincerely,

                Dennis D. Müllert

                Comment


                  #10
                  I can confirm with autobrake 2 and once I idle the reverse thrust at 70 kts the plane just maintain that speed until I switched to manual brake.
                  Bai Jian

                  Comment


                    #11
                    Anyone know if this is being looked into? After several flights, I feel pretty similarly that Autobrake 2 is way weaker than expected. If the new practice is to use Autobrake 3 all the time, then I guess that's the work around?... seems excessive.
                    Antonio King

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