Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to General Electric Aircraft Engines (GE) CF700 series turbofan engines. This proposal would require replacement of existing fan guards with new, improved fan guards. This proposal is prompted by a report of uncontained fan blades which separated from the engine during an overspeed. The actions specified by the proposed AD are intended to prevent an overspeed of the aft fan disk from resulting in an uncontained engine failure and damage to the aircraft.