Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above with certain part number (P/N) fan rotor spinners installed. This proposed AD would require removing from service certain fan rotor blade retainers, and removing from service the fan rotor spinner support that was installed with those fan rotor blade retainers. This proposed AD was prompted by a fan rotor spinner support found cracked at the attachment lugs. We are proposing this AD to prevent high-cycle fatigue cracking of the fan rotor spinner support attachment lugs, leading to separation of the fan rotor spinner assembly, uncontained failure of the engine, and damage to the airplane.