Summary
The FAA proposes to adopt a new airworthiness directive (AD) for General Electric Company (GE) CF6-45A, CF6-50A, CF6-50C, and CF6-50E series turbofan engines that have not incorporated GE Service Bulletin (SB) No. CF6-50 S/B 72-1239, Revision 1, dated September 24, 2003, or that have not incorporated paragraph 3.B. of GE SB No. CF6-50 S/B 72-1239, original issue, dated May 29, 2003. This proposed AD would require inspecting the stage 1 low pressure turbine (LPT) blades for damage and replacement of the LPT module if necessary. This proposed AD results from a report of a stud that separated from a turbine mid frame (TMF) strut and from an updated analysis of strut stud failures. We are proposing this AD to prevent an uncontained failure of the engine and possible damage to the airplane caused by failure of TMF strut studs.