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Thread: Carb Ice with the 0-200A

  1. #1
    Member stroutmail's Avatar
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    Default Carb Ice with the 0-200A

    This is my second year with the S1 (SN 28). Plane came from Michigan and previous owner claims to never have had carb ice. I have not experienced it either.

    Yet, I read so many stories of the 0-200 being an "ice maker" that I am always careful and vigilant. I try not to fly unless ambient and dew point differential is 15F (8C). I always use carb heat while decending in the pattern (turn it off on short final). On days that I suspect risk (see photo) carb-ice-potential-chart.jpg I also test carb heat just before takeoff if I have taxied a long way. (Like when doing pattern practice to a full stop.)

    Just did a cross country with ambient of 45F and dewpoint of 28F. At 2500 AGL, outside temp had fallen to 37F. Clouds forming at 4000 AGL. Seemed like high risk (Serious icing while cruising per red chart) for carb ice when crusing at 2250 rpm, so I kept pulling carb heat about every ten minutes or so---and noticed no carb ice. (I run the 52 cartridge on the Sensenich adjustable--so 2250 is my 90-93 mph cruise. If I push the RPM up to 2500, I am way outside of the green arc. Not sure what condiitions are OK outside the green arc---I do know that in central PA below 4000 feet, my little cub moves around a lot--up/down, side to side. ( I dared not let the engine run below 2250. My preferred flying is a little slower 80-85 mph at 2150 RPM. )

    Am I being too careful?

    Is there an CC approval for a carb temp gauge or the optical sensor type for our cc11-100's?

    Appreciate comments and discussion....
    Last edited by stroutmail; 11-04-2019 at 03:57 PM.

  2. #2
    Senior Member Pete D's Avatar
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    Default Re: Carb Ice with the 0-200A

    I am not sure if there is a carb ice gauge approved for the Sport Cub. I have seen them in other airplanes but very rarely.

    I have quite a bit of time in different Sport Cubs, mostly our Sn 71 which is an S2. I have had carb ice a few times, always in very wet conditions and typically only on the ground. My normal SOP is to taxi at a higher power setting in those conditions, turning the carb heat on to clear it as needed then turn it off. When I line up to take off I will set full power, turn carb heat on as long as needed to clear it up then carb heat off and release the brakes for the takeoff roll. I've never had it ice back up doing that. The conditions I had to do this in were heavy rain over night which soaked the grass so lots of water everywhere (vapor trails off everyone's props) but not actually raining when I was departing so once clear of the ground the moisture level went down significantly.
    Pete Dougherty
    R & D Shop Manager
    Cub Crafters Inc

  3. #3
    Member stroutmail's Avatar
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    Default Re: Carb Ice with the 0-200A

    Wow. "vapor trails from props". That would be a sure sign of 100% humidity!

    SA_029.pdf

    Above is a link to a NTSB Alert that got my attention. The Alert provides links to FAA Advisories.
    Last edited by stroutmail; 11-05-2019 at 05:36 PM.

  4. #4
    Member stroutmail's Avatar
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    Default Re: Carb Ice with the 0-200A

    Here is a pretty good video on carb ice..the Cessna 140 he is flying, with a Continental C85 is pretty close comparison to the Sport Cub. Note it is the increase in RPM after using carb heat in cruise that confirms ice was there. It was the small drop in RPM (almost simulating throttle reduction) when throttle was fixed (in conditions where ice is possible) that created suspicion that carb ice was present in cruise.



    In my part of the country, that range of temp and humidity where carb ice is possible covers most of the whole calender.

  5. #5
    Member stroutmail's Avatar
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    Default Re: Carb Ice with the 0-200A

    https://airfactsjournal.com/2019/11/that-other-ice/

    This article showed up in my inbox. This guy was plagued with carb ice.

  6. #6
    Member stroutmail's Avatar
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    Default Re: Carb Ice with the 0-200A

    http://https://www.reddit.com/r/flying/comments/du3rvx/i_declared_an_emergency_today/?utm_medium=android_app&utm_source=share

    Another article about carb ice with 0-200. Central Texas is not a place you normally think has high humidity.
    Last edited by stroutmail; 11-10-2019 at 02:04 PM.

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