Publisher's Synopsis
An eight-inch-long (0.2 m) crack was found in an external fuel-tank pylon of a U.S. Coast Guard HH-60 helicopter. The damaged pylon was removed from service and destructively examined at NASA Langley Research Center (LaRC) to determine the cause of the crack. Results of the analysis revealed that crack initiation occurred at corrosion pits in a fastener hole and crack propagation was a result of cyclic loading. Newman, John A. and Piascik, Robert S. and Lindenberg, Richard A. Langley Research Center NASA/TM-2002-211645, L-18164, NAS 1.15:211645, ARL-TR-2711...
