ATA 28

Wing Fuel Leak Repair
Fuel leak repairs on the Westwind should be a straightforward issue, but, unfortunately, we have found that to be untrue. Case in point – a Westwind was going through a pre-purchase inspection and 26 #30 holes were found drilled through the upper wing skins at the W.S. 62.0 and 126.0 ribs, both sides. These are the main ribs that form the inner and outer bulkheads of the wheel wells. The holes were put there to inject sealant to fix some leaks, I assume, because some other aircraft were designed to be sealed that way.
I can not find that anywhere as an approved procedure for the Westwind. There wasn’t even a logbook entry. What is so hard about doing these repairs right? We have installed a lot of bushings in wings over the last few years due to misdrilled holes, oversized fasteners, wrong hardware, and just plain negligence.
Watch the fuel crews, ask questions, and if you need to have a repair scheme, contact Worthington Aviation for engineering. They are there to assist you with problem solving. Don’t let sloppy repairs cost you more money down the road.