NTSB has just issued an urgent recommendation letter (.pdf) asking FAA to order immediate inspections of GE GEnx engines. The recommendations:
Issue an airworthiness directive to require, before further flight, the ultrasonic inspection of the fan midshaft in all General Electric GEnx-1B and -2B engines that have not yet undergone inspection. (A-12-52) Urgent
Require operators to accomplish repetitive inspections of the fan midshaft (FMS) in all (on-wing and spare) General Electric GEnx-1B and -2B engines at a sufficiently short interval that would permit multiple inspections and the detection of a crack before it could reach critical length and the FMS fractures. (A-12-53) Urgent
NTSB's move comes following a preliminary look into evidence from the second GEnx failure in two months.
Plenty more to come....