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Dear,

I am using custom radiator with my Rotax 914. Since it is without suffix 01, so I am using EVANS NPG PLUS. Its flight hours are around 2 hrs. Today when I opened pressure cap of radiator after 30 mins of flight I found white gray sludge in my radiator neck and on pressure cap as shown in picture in the attachment.

I don't know why and how it happened as I never found this type of material in cooling system of my old aircrafts and other aircrafts of flying club using rotax with waterless coolant.

Expert opinion is requested.

Regards

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IMG-20190219-WA0001.jpg (You do not have access to download this file.)
IMG-20190219-WA0003.jpg (You do not have access to download this file.)
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