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sidsel.svein(at)oslo.onli
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 Posted: Mon Nov 14, 2011 11:19 am Post subject: "Flight into known icing conditions prohibited" |
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<![if !supportLists]>- <![endif]>is one of the placards on my panel, next to “VFR operations only”. We all have heard about the danger of icing, and we understand why it can be fatal.
Today I ran the engine on idle for 3-4 minutes on the ground (prior to squirting engine conservation oil into the carbs until stopping, for winter storage). It was a foggy day, air temperature just around freezing. A soft, very thin layer of frost formed on the wings and fuselage when pulling the aircraft out of hangar. I had not, however, expected to see the rapid build-up of ice on the propeller during this very short run – see the attached two photos. There was no ice on the front face of the blades, but on the sharp leading edge there was a 4 mm buildup of clear, very hard and difficult to remove ice (gradually diminishing towards the blade root). This is seen as a white stripe along the leading edge on the photos. Ice had also begun to build up on the blade back face and on the tip edge.
One can only imagine the loss of propeller efficiency and risk of vibration if flying through clouds or fog around/below the freezing point. I did not need this demonstration to heed the placard’s warning, but it does bring the message home.
Fly safely!
Regards,
Svein
LN-SKJ
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AirEupora
Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA
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| Posted: Mon Nov 14, 2011 4:16 pm Post subject: Re: Ice & fog |
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A number years ago I was flying along the Alaska coast on a job in a Hughes 500. The fog keep getting lower and I had to fly lower to the ground. Then the whole helicopter started to vibrate through the controls to the point I had to make a landing quickly. Once on the ground I shut the engine off and there was about 1/4 -3/8 of inch of ice along the leading edge and under it.
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