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TAKE-OFF THRUST PROBLEM

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    TAKE-OFF THRUST PROBLEM

    Good evening, I’m David and I’m new.
    One question: why when I use the 737-800 and every time I start the flight in Cold And Dark after setted up the FMC correctly, when I press TOGA the left engine and sometimes both go down and I'm forced to do a Rejected TakeOff and take off again? Always at the first Flight and TOGA, gives me this problem. On the second attempt no loss of power. Why?

    David Carannante

    #2
    Hi David,

    At what speed does this occur?
    At 84 knots the A/T mode changes to THR HLD and the autothrottle servos release the throttles. If the throttles on your hardware provide any input it can move the thrust levers and possibly engage the RTO autobrakes.
    Somewhere there is an option under "simulation" where you can change if your hardware throttles override the A/T system. Make sure that one says "NEVER" and see if that solves your problem!
    Jasper Tillaar
    FO 737-700/800/8200

    Comment


      #3
      To add make sure your thrust levels are the same and not split prior to TOGA. I recommend letting N1 thrust levels settle at 40% prior to engaging TOGA.

      Split thrust levels will cause A/T to disengage during TOGA.
      Last edited by Falcon99; 30Nov2022, 17:34.
      George Morris

      Comment


        #4
        I had similar problem where A/T was disconnecting as soon as I hit TOGA. What helped me was as mentioned above set override to never and stabilise engines close to 50 N1. When I stabilised them on 40 N1 I had same problem after hitting TOGA.
        Damian Banaszczyk

        Comment


          #5
          Ok, thanks a lot to both of you for the replies. Falcon99 and Jaspert0109 The problem occurs when I'm on the runway for the take off phase. Once I put the thrust to 40% and it stabilizes, I engage the toga. The engines start to increase the thrust, but everything fails me immediately… I'll try to see (as you say Falcon99 ) if the thrust levels at stabilization are different. If they are different then I put them on the same level. After that, I'll see if the problem goes away. If not, and the problem persists, I will write to you again.
          Thank you very much and good evening.

          David Carannante​

          Comment


            #6
            David, one other thing, after you stabilize your engines and hit TO/GA, push your thrust levers up to take-off power. On the actual airplane, the thrust levers would move automatically when you hit TO/GA, but obviously not possible for this to happen in the simulator since a lot of the throttle quadrants that are out there aren't motorized.
            Captain Kevin

            Kevin Yang

            Comment


              #7
              Originally posted by CaptainDave93 View Post
              Ok, thanks a lot to both of you for the replies. Falcon99 and Jaspert0109 The problem occurs when I'm on the runway for the take off phase. Once I put the thrust to 40% and it stabilizes, I engage the toga. The engines start to increase the thrust, but everything fails me immediately… I'll try to see (as you say Falcon99 ) if the thrust levels at stabilization are different. If they are different then I put them on the same level. After that, I'll see if the problem goes away. If not, and the problem persists, I will write to you again.
              Thank you very much and good evening.

              David Carannante​
              One other item I just thought of that could be helpful. I have enabled the show my throttle indicators in the options page. This helps set each throttle to 40. It is important to ensure no split prior to engaging TOGA. Both indicators should be at 40%.
              George Morris

              Comment


                #8
                Good morning Jaspert0109 Falcon99 I had a flight last night and I must say that the problem was solved by you. I have aligned both engines as I was told. I aligned them around 42/43% (the left was around 43.80% and the right around 43.56%). Once they stabilized I pressed the TOGA. A good roar of the engines and a good rotation and we left the runway of Barcelona El Prat without any Rejected Take-off.

                Thank You
                David Carannante

                Comment


                  #9
                  Originally posted by CaptainDave93 View Post
                  Good morning Jaspert0109 Falcon99 I had a flight last night and I must say that the problem was solved by you. I have aligned both engines as I was told. I aligned them around 42/43% (the left was around 43.80% and the right around 43.56%). Once they stabilized I pressed the TOGA. A good roar of the engines and a good rotation and we left the runway of Barcelona El Prat without any Rejected Take-off.

                  Thank You
                  David Carannante
                  I am glad we could assist, thanks for letting us know. Watching engine output is a core skill that is learned for multi engine operations. While my real word experience is in piston multi engine aircraft, I have never experienced a throttle quadrant that didn’t have some level of throttle position differential.

                  Just wait until we get to the 747.
                  George Morris

                  Comment


                    #10
                    Originally posted by Falcon99 View Post

                    I am glad we could assist, thanks for letting us know. Watching engine output is a core skill that is learned for multi engine operations. While my real word experience is in piston multi engine aircraft, I have never experienced a throttle quadrant that didn’t have some level of throttle position differential.

                    Just wait until we get to the 747.
                    I hope that PMDG will be able to make a nice 787-10 Dreamliner with EFB and a very high level of detail as you can do that is comparable to reality. Quality Wings as 787 didn't blow my mind as much ☺️

                    Comment


                      #11
                      Dave, hopefully some day they will tackle a 787. My comment was more towards monitoring and balancing differential thrust across four engines.
                      George Morris

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