Airworthiness Directives; Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines

 an HPC IBR-7 separation that resulted in an aborted takeoff. In the NPRM, the FAA proposed to require repetitive AUSIs of the HPC 15th-stage disks, front turbine hubs, HPT 1st-stage air seals, and HPT 2nd-stage hubs for crack indications, and removal from service and replacement if necessary. The FAA also proposed to require removal from service and replacement of the HPT 1st-stage air seal for certain serial numbers. The FAA is issuing this AD to address the unsafe condition on these products. Discussion of Final Airworthiness Directive Comments The FAA received comments from six commenters. The commenters were the Air Line Pilots Association, International (ALPA), All Nippon Airways (ANA), The Boeing Company (Boeing), PW, United Airlines (United), and an individual. The following presents the comments received on the NPRM and the FAA's response to each comment. Support for the NPRM ALPA, Boeing, and United expressed support for the NPRM. Request To Include ``Or Later'' Following Date of Material Citations ANA requested that the FAA revise the material citations specified in paragraphs (g)(2)(i) through (iv) of the proposed AD to read ``or later'' following the revision date. ANA stated that if the material is revised in the future, an AMOC would be required for implementation. The FAA disagrees with the request. To incorporate by reference (IBR) the material specified in thi