Newkentboy Posted April 8 Report Share Posted April 8 (edited) Any idea of cause of this white powder at rear of engine compartment? The plane is undergoing an annual and the A&P sent me the picture. I thought I’d ask the experts. This is a 912iS. Edited April 8 by Newkentboy Add engine type Quote Link to comment Share on other sites More sharing options...
Newkentboy Posted April 8 Author Report Share Posted April 8 Also, the residue has a yellowish tint. Quote Link to comment Share on other sites More sharing options...
DHeal Posted April 8 Report Share Posted April 8 It appears that the heat insulation tape (?) wrapped around the coolant hose (?) may be fastened with some form of adhesive (no clamps visible?) -- perhaps this adhesive is being melted by the heat and/or petroleum products and flowing aft??? Quote Link to comment Share on other sites More sharing options...
Newkentboy Posted April 8 Author Report Share Posted April 8 Thanks. I’ll pass it on to the A&P. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted April 9 Report Share Posted April 9 How new is the airplane,and what color is your coolant? Quote Link to comment Share on other sites More sharing options...
Newkentboy Posted April 9 Author Report Share Posted April 9 The plane is a 2019 with about 315 hours. The coolant is blue. The stain is yellowish. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted April 9 Report Share Posted April 9 The blueish coolant is likely the OEM that the airplane was shipped with from Europe. I am not certain what it looks like when there is a leak and it dries, but with the location I would suspect a small coolant leak from the hose at the spring clamp. I have seen this kind of leak before when the hose has been freshly installed. Normally a reseating of the clamp will fix it. Also it is unlikely to become a catastrophic failure, just a nuisance. Quote Link to comment Share on other sites More sharing options...
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