Summary
The FAA proposes to revise an existing airworthiness directive (AD) for General Electric Company (GE) CF6-50C series turbofan engines. That AD currently requires reworking certain forward fan stator cases and installing a fan module secondary containment shield. This proposed AD would require the same actions but would eliminate a certain service bulletin from the compliance method. This proposed AD results from a review that shows that only one of the service bulletins referenced in the original AD is applicable as a compliance method. We are proposing this AD revision to prevent uncontained fan blade failures, which can result in separation of airplane hydraulic lines, damage to critical airplane systems, and possible loss of airplane control.