According to the Department of defence, all F-35s in the Air Force, Navy and Marines have been grounded after an engine inspection revealed the crack on the engine blade.
Inspectors found the crack in an F135 engine installed in an F-35A Lightning II aircraft at Edwards Air Force Base, Calif. This is the conventional take-off and landing version of the joint strike fighter.
The Air Force has shipped the cracked engine to Pratt & Whitney's engine facility (it makes the engines) in Connecticut for further evaluation. It's supposed to be only a precautionary measure but it's yet another embarrassing failure for the F-35. Whether it's parachutes being loaded the wrong way or power systems affecting the temperature or software bugging out in simulations, there's always something going wrong with these planes. Maybe some things just aren't meant to be.