Originally Posted by
SpazSinbad
"The low pressure section of the F-135 has bediveled the program before. The fleet was grounded from Feb. 21- March 1, 2013, due to the discovery of a 0.6 in. crack discovered on a third-stage low-pressure turbine blade on AF-2, an F-35A used for testing, at Edwards AFB, California.
Pratt officials attributed it to a one-off manufacturing issue and not related to high-cycle fatigue."