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​Boeing photo of a KC-46A.

​Boeing has sued two of its suppliers for allegedly mislabeling chemicals that damaged the refueling systems in a KC-46A, which delayed its first flight in 2015 by a month. The lawsuit, filed Friday in a California federal court, calls for at least $10 million in damages from Able Aerospace Adhesives and AflaKleen Chemical Labs, The Seattle Times reported. Boeing claims that the suppliers provided them with a chemical labeled that it met an Air Force requirement, though it did not, the paper reported. “When the liquid was introduced into the aircraft’s fuel boom and fuel system, the l​iquid damaged the components it touched,” the lawsuit states. “The fuel boom and fuel system were damaged, and a number of the components comprising the fuel boom and fuel system had to be replaced.” Boeing confirmed it had filed the lawsuit, but said it could not comment further on a pending legal matter. Able Aerospace Adhesives and AflaKleen Chemical Labs also declined to comment.