Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines

the NPRM, the FAA proposed to require prohibiting the installation of certain lubrication/scavenge pumps unless certain installation criteria are met. The FAA is issuing this AD to address the unsafe condition on these products. You may examine the MCAI in the AD docket at regulations.gov under Docket No. FAA-2026-4640. Discussion of Final Airworthiness Directive Comments The FAA received comments from two commenters. Commenters included the Air Line Pilots Association, International (ALPA) and Delta Air Lines, Inc (DAL). ALPA supported the NPRM without change. The following presents the comments received on the NPRM and the FAA's response to each comment. Request To Prohibit Operation of an Engine With an Affected Part DAL requested that the FAA revise paragraph (h)(2) of the proposed AD to prohibit the operation of an affected part unless the installation criteria defined in RRD Non-Modification Service Bulletin (NMSB) TRENT 1000 79-AK868, Revision 3, dated December 11, 2023 (RRD NMSB TRENT 1000 79-AK868, Revision 3) are met. DAL stated that two of the installation criteria defined in RRD NMSB TRENT 1000 79-AK868, Revision 3 require knowledge of the cycles since repair (CSR), cycles since overhaul (CSO), and cycles since new (CSN) of the oil pump on the opposite engine. DAL noted that during installation of an affected part on a spare engine or during an engine shop visit for