We had a couple of reports of the fuel return lines that pass through the TKS tanks in the wings experiencing some corrosion and leaking small amounts of fuel into the TKS tank. It was initially noticed due to blue staining at the vent for the TKS fluid. When the fuel lines were inspected there was some noticable pitting on the tube and when put under pressure caused some leaking.
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| Fuel return line |
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| Typical Pitting |
To solve this problem, we recently released Service Bulletin
SB2X-28-11 which installs a new anodized fuel return line and then covers the line with sealant after installation.
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| Sealed Fuel Return Line |
