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john beirne
Joined: 02 Oct 2006
Posts: 24
Location: Ireland
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 Posted: Mon Jan 22, 2007 2:00 pm Post subject: Cooling liquid EVANS NPG+ |
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While not available on this side of the pond (at least I have never seen it) this coolant comes to the attention of the FAA in the most recent Bi-Weekly AD listing,
I have, however seen mention of it in the Rotax list so I suppose some fox owners here may be using it. Incidentally this AD refers to The Stemme S10-VT Motor glider and not to Rotax engines or kitfox aircraft
John.
Extract from FAA Bi-Weekly 2007-02
“The mandatory continuing airworthiness information (MCAI) states that:
During certification works it was found that the cooling liquid EVANS NPG+ is flammable. The liquid cooling circuit of the Stemme S10-VT is not designed to be filled with a flammable liquid without prior modifications. For that reason, this Emergency AD requires the replacement of the EVANS NPG+ cooling liquid. In addition, the operation limit of the cylinder head temperature must be temporary changed to 120ºC / 248ºF.
Actions and Compliance
(e) Prior to further flight as of January 29, 2007 (the effective date of this AD), unless already done, do the following actions.
(1) Replace the EVANS NPG+ cooling liquid in accordance with the instructions of Stemme F&D Service Bulletin A31-10-076 Am. Index: 01.a, dated October 9, 2006”
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rjdaugh
Joined: 30 Aug 2006
Posts: 195
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| Posted: Mon Jan 22, 2007 2:56 pm Post subject: Cooling liquid EVANS NPG+ |
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John,
Very interesting! Thanks for sharing this with the list.
I can testify that the 912S will boil over at random times if you use normal glycol/water antifreeze. It happened to me Christmas day of 2005 with an outside temp of about 32F. This was after flying all the previous winter and all summer with the same antifreeze. The way it was explained to me was that boiling bubbles form on the inside surfaces of the coolant openings of the heads. Most of the time these bubbles collapse, but if they don't, they can allow a hot spot to form and the steam insulates the spot and allows further over heating. I don't know, but it did happen.
I got the Evans coolant from Aircraft Spruce along with a gallon of their flush. No problems since.
It does make sense that the Evans propylene glycol based coolant is flammable. My overflow reservoir is of course plastic......
Which side of the pond are you on?
Randy
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_________________
Randy
Kitfox 5/7 912S
Black Hills, South Dakota |
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