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  1. #1
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    Wink 737 OHD Systems basic IRS logic

    Somebody in another thread asked me about transplanting the IRS function from the 747 overhead logics to the 737 overhead logics.
    Here’s what I did.
    First, in the 737 graphics, I converted the DispSource knob to be the IRSSelector1 knob by simply renaming it. I kept the old line as a remark for backup sake. Here’s what I added:

    //element knob3,-184.8,-44.0,DispSource
    element knob3,-184.8,-44.0,IRSSelector1

    You may wanna additionally play with the “text” instructions around the knob and re-label them according to the three IRS knob positions (OFF – ALIGN – NAV), which have logic values of 0, 1 and 2.

    Then, in the 737 logics:
    - in the [consts] section, I added one line for the timer duration:
    irstimer = 1200
    (where this value is equivalent to the standard 10 mins. of a full alignment cycle).
    - in the [logics] section, I added these lines, grossly taken from the 747 Systems:
    if IRSSelector1=0 then
    IRSAligned1=0
    endif

    if ((IRSSelector1=2) or (IRSSelector1=1)) then
    IRSAligned1 = counter irstimer 2
    endif

    if (IRSSelector1=1) and (IRSAligned1 = irstimer) then
    IRSAligned1=irstimer - 2
    endif

    if (IRSAligned1 >= irstimer) then
    IRSNotAligned = 0
    else
    IRSNotAligned = 1
    endif

    Take it as it is, a basic inspiration; I am aware that this is not the full logic, and that it is based on a single IRS System, but it does anyway give you something to do about IRS when you’re setting up the cockpit before departure … any suggestion, correction, further development is absolutely welcome.


    Have fun !!!

    Happy landings and always three greens !!

    Eu

  2. Thanks Trevor Hale thanked for this post
  3. #2
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    To be precise ...

    737 users know that the IRS System has two knobs, with four positions each: OFF - ALIGN - NAV - ATT

    I had forgotten one, sorry !

    Happy landings and always three greens !!

    Eu

  4. #3
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    What's a knob or two, among friends?!
    VANCOUVER
    Jet fighter / single pilot sim, plus thinking of a 777 as a secondary sim.

  5. #4
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    Wink

    Hey there Paul ...

    maybe you meant "what are three positions or four, among friends ?" ... ?

    Happy landings and always three greens !!

    Eu

  6. #5
    75+ Posting Member PeterH's Avatar
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    Hi,

    just to add my 2 cts worth idea: have you ever tried Thomas Richter´s very neat program called "Cockpit Systems B737" yet?
    There you can find also the IRS part with offsets for the 2 kobs.
    It´s really worth buying it. No messing around with offsets anymore as the entire overhead can be tested.

    Best regards

    Peter

  7. #6
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    Yes ...

    ... I've recently bought Thomas' 737NG, and am now focused on the Autoflight Annunciators function.

    Having no physical overhead (I keep PMSystems on a flat display hanging over the pedestal, coupled with a few GoFlight modules), I must depend on the graphic development of PMSystems.

    Thanks for the suggestion, anyway !

    Happy landings and always three greens !!

    Eu

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