A Pratt & Whitney F135 engine undergoes ground testing at Arnold Air Force Base in Tennessee. (Rick Goodfriend/U.S. Air Force)  

Defense News: Pentagon orders engine vibration fix for entire F-35 fleet worldwide 

WASHINGTON — All F-35 fighter jets should be retrofitted within 90 days with a fix intended to solve a potential engine vibration problem, the F-35 Joint Program Office said Thursday. 

The JPO issued an order Wednesday evening recommending the fleetwide retrofit — globally, not just American aircraft — over the next three months, as well as immediately putting it in place for a “small number” of fighters that have been grounded since December.  

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Update #1: US military orders fleet-wide F-35 retrofit to address F135 engine issue (Flight Global)

Update #2: JPO directive orders F-35 retrofit to return grounded jets to flight (Breaking Defense)  

WNU Editor: The Pentagon wants these fighter jets flying ASAP.