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  1. #1
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    Boeing Starter Cutout (correct N2 value) ...

    Hello folks !

    First, is it a correct statement that, on a B737-700, the starter cut-out should happen at 56 % N2 ?

    Second, and if so, can anyone of you point me to the line of code where this is programmed within the PMSystems, in order to rectify it ?

    Thanks and always three greens !

    Eu

  2. #2
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    Yes, for the NG series it is 56% n2, classics series are 52%, don't know why in Pmsystems it is programmed wrongly also they use N1 value >10 for cut engine starters, normally i delete those lines 'cause i have SIOC that handle the code, but you can modify the value to >20 for example that contains,
    For Engine 1:

    else
    manengstart1 = (fs1n1 > 10)
    endif

    And the for the engine2:

    else
    manengstart2 = (fs2n1 > 10)
    endif

    For your reference the section in .lgc file is below:


    //EngStart-Begin
    if ManEngStart1 = 0
    if fsstartflag1 = 0
    if bleed1ref > 0
    fsStarter1 = 1
    else
    fsStarter1 = 0
    endif
    else
    manengstart1 = (fs1n1 > 10)
    endif
    else
    if elecbus1 and drive1cover
    fsstarter1 = 2
    else
    fsstarter1 = 0
    endif
    endif
    if ManEngStart2 = 0
    if fsstartflag2 = 0
    if bleed2ref > 0
    fsStarter2 = 1
    else
    fsStarter2 = 0
    endif
    else
    manengstart2 = (fs2n1 > 10)
    endif
    else
    if elecbus2 and drive2cover
    fsstarter2 = 2
    else
    fsstarter2 = 0
    endif
    endif
    //EngStart-End

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