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Typo in heavy maintenance manual - fuses

in 912iS Technical Questions 6 years ago
Hi, the fuses listing on page 351 states that F20 should be 30 amps, but my board has 20A fitted and the board is marked as 20A for that one so looks to be a typo in the manual.




Interestingly though, this led does not light up even though the fuse is fine. It's purpose is listed as "ATO" fuse. Any idea what ATO means in this context, and is it intentional that this led does not light up? Engine has over 140 hours and runs fine.

TIA, David
IMG_2821.JPG (You do not have access to download this file.)
912iHeavyMaintenanceManual-fuses.pdf (You do not have access to download this file.)

  • Re: Typo in heavy maintenance manual - fuses

    by » 6 years ago

    Blade fuses (also called spade or plug-in fuses), with a plastic body and two prongs that fit into sockets, are mostly used in automobiles. Each fuse is printed with the Rated Current in Amperes on the top. These types of fuses come in four different physical dimensions: low-profile mini (APS), mini (APM / ATM), regular (APR / ATC / ATO), and maxi (APX) heavy-duty. Unofficially, the APS fuse is sometimes called "micro" since the term means smaller than mini. Regular blade type fuses, also known as standard fuse, were developed in 1976 for low-voltages use in motor vehicles. The mini fuses were developed in the 1990s. Blade type fuses can be mounted in fuse blocks, in-line fuse holders, or fuse clips. The ATC fuse has a fuse element that is closed or sealed inside the plastic housing and the ATO fuse has a fuse element that is open or exposed on the bottom of the fuse between the blades.

    So, basically the ATO has an exposed fusible element.

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

      
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  • Re: Typo in heavy maintenance manual - fuses

    by » 6 years ago

    The little LED on each fuse only lights up when the fuse has FAILED.
      
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  • Re: Typo in heavy maintenance manual - fuses

    by » 6 years ago

    Thanks Roger, so for F20 and F21 we don't know the function of these if ATO refers just to the fuse type. I'm very interested to know if anyone else sees this one lit up when they are powered up.

    Hopefully Rotax will spot my reference to the manual and get the typo amended.
      
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  • Re: Typo in heavy maintenance manual - fuses

    by » 6 years ago

    Thanks DHeal, but these LED's are on the circuit board within the fusebox and not on the fuse itself. They all light up when you switch on start power and lanes A and B. You can't see that very well in the previous picture as sunlight was too bright. I don't have a good pic with the cover off, but you can see them through the cover all lit up in this pic:
    IMG_2807.JPG (You do not have access to download this file.)
    IMG_2804.JPG (You do not have access to download this file.)
      
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  • Re: Typo in heavy maintenance manual - fuses

    by » 6 years ago

    Note: To the General population...
    This issue is specific only to the 912is and 915 Fuse Box.
    If you have any other engine, this will not affect you.

    The Fuses are the Main Generator Fuses.

    Gen A = 220W (14.2v @16A) Fused at 20A, (30A would be Over-Fused!)
    Gen B = 420W (14.2v @ 30A) Fused at 35A

    Just Guessing...
    The lights come ON when the Generator Output is Present.
    The Gen B is connected to the Battery before engine start, so it will see power.
    The Gen A Lamp will be dark until the engine starts.

    And I Agree, ATO just refers to the Physical size of the Fuse.
    They are specifically called out because they are the only ATO size fuses on the board.
    If you have an automobile that is less than 30 years old, you have dozens of ATO fuses under the dash.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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