WASHINGTON, Sept. 14 -- Federal Aviation Administration has issued a proposed rule called: RIN 2120-AA64.
The proposed rule was published in the Federal Register on Sept. 14 by Brian Knaup, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service.
Summary: The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model CFM56-5B, CFM56-5C, and CFM56-7B engines with a certain high-pressure turbine (HPT) inner stationary seal installed. This proposed AD was prompted by multiple reports of honeycomb separation from the surface of HPT inner stationary seals. This proposed AD would require initial and repetitive borescope inspections (BSIs) of the rotating ai...