Airworthiness Directives; Pratt & Whitney Division Engines

rioration, which can lead to erroneous Pb sensor measurements and incorrect fuel commands. In the NPRM, the FAA proposed to require replacing Pb sensors within certain compliance times. 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 10 commenters. Commenters included Air Line Pilots Association, International (ALPA), Atlas Air, Boeing Commercial Airplanes (Boeing), Delta Air Lines, Inc (DAL), European Air Transport Leipzig GmbH, FedEx, the Foundation for Aviation Safety, PW, United Airlines (United), and United Parcel Service (UPS). ALPA and Boeing supported the NPRM without change. The following presents the comments received on the NPRM and the FAA's response to each comment. Request To Include Service Material as an Approved Method of Compliance Atlas Air and UPS requested that the FAA revise the NPRM to include the use of certain service material as acceptable forms of compliance with the NPRM. Specifically, Atlas Air requested that the FAA include Collins Aerospace Service Bulletin (SB) EEC1-73-62 or PW SB PW4ENG 73- 221 as approved methods of compliance. UPS requested that the FAA include replacement of Pb sensors with new Pb sensors (in accordance with the component maintenance manual or other approved procedures) and accomplishment of Collins Aerospace SB E