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#11
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On Nov 8, 8:23*pm, "Jon Woellhaf" wrote:
Do any of you have experience repairing a slight, but annoying, leak in a wet wing tank? Mine's on a 1980 182Q. The basic procedure is to drain the tank and open up access panels in the tank. Then you should clean off the sealant in the area of the leak and apply new sealant and allow to dry. Cessna access panels typically require sealant when being installed, others use gaskets or orings. There are two types of sealant, low adhesion for panels that need to be removed and a tougher high adhesion for the actual tank structure. Part numbers vary but there are a number of different makers of these two part sealants. Make sure that what you are using is correct number for the application and that it traces to the manufacturer's part number. In an older aircraft it can be difficult to precisely locate the leaking area as sometimes the fuel will run along the structure and appear some ways away from the actual leak. If it is a fastener that is leaking that is easier to determine. It is possible to lay new sealant on top of old but sometimes the new sealant doesn't take. Thorough mixing and accurate measuring of sealant components is very important if it is to cure properly. On a lot of older aircraft, particularly Mooneys, eventually there is nothing to be done but completely open up the tanks and remove all existing sealant and reseal every seam and joint, not a job for the faint of heart. It is sometimes possible to drain the tank as above and drill out a leaking fastener and replace it with a blind rivet coated in sealant. John Dupre' |
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