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912 uls idle mixture and balance

in General Tech Discussion 6 years ago

  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    My Experiential Operating Limitations clearly state that any Major Change requires a return to Phase 1 for 5 hours. And, of course, an appropriate logbook entry. Building and installing a larger balance tube was not a major change. Going from the original 2 carb setup to a single fuel injection system probably would be. That really looks fine by the way. Not gonna do it though. :-)

    Alan
      
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  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    "Building and installing a larger balance tube was not a major change."

    Why do you think this isn't a major change. My question would be who gets to make that decision? It altered the engine from the MFG. Only a few people in the world have done this.
    I have never ever seen any test data from a reliable source for the change ever published. Many in their experimental Operating limitations have to get approval from the FAA. I've read it many times in owners paperwork.

    Plus the fact that yours doesn't come right out and say you need approval shows that there is no consistency from inspectors issuing these limitations and why everyone should read theirs word for word before any modification.

    Using one brand of hose over another for a fuel line may not be a major change, but this tube alters the engine performance which people have claimed. Altering the engine performance is a major change.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    I asked my DAR before flying the airplane. I do agree about the lack of consistency.

    Alan
      
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