FAA proposes airworthiness directive for CFM56 engines over HPT seal honeycomb separation

The FAA is proposing a new airworthiness directive for certain CFM56-5B, -5C, and -7B engines following multiple reports of honeycomb separation from HPT inner stationary seals. The directive would mandate initial and repetitive borescope inspections of the rotating air HPT front seal, with replacement if cracks are found. This is a regulatory safety action affecting commercial aviation maintenance, with potential operational and cost implications for airlines.