The FAA proposed to amend 14 CFR part 39 with a proposed airworthiness directive (AD). The proposed AD applies to Hartzell Propeller Inc. (formerly TRW Hartzell Propeller) models HC- B3TN-2, HC-B3TN-3, HC-B3TN-5, HC-B4TN-3, HC-B4TN-5, HC-B4MN-5, and HC- B5MP-3 turbopropellers by revising AD 83-08-01R1, Amendment 39-4633 (48 FR 17576, April 25, 1983), which is applicable to the same turbopropellers. We published the proposed AD in the Federal Register on October 20, 2004 (69 FR 61611). That action proposed to require the same actions as AD 83-08-01R1, except that it would not be applicable to propellers installed using P/N B-3339 bolts and P/N A-2048-2 washers, and it would not require an additional onetime torque-check of P/N A-2047 bolts. This AD results from the need to make nonsubstantive wording changes and additions to clarify that terminating action is achieved by attaching propellers with P/N B-3339 bolts and P/N A-2048-2 washers or other equivalent FAA-approved serviceable bolts and washers, to the engine flange, as instructed in the compliance section of this AD. \n\nComments \n\n\tWe provided the public the opportunity to participate in the development of this AD. We have considered the one comment received. \n\nRequest To Add Parts Manufacturer Approval (PMA) Parts \n\n\tOne commenter requests that we modify the compliance section to state that PMA equivalent parts can also be used to attach the propeller. The commenter states that the proposed AD did not reference all FAA-PMA parts. \n\tWe partially agree. For clarification, we have added references to the use of other equivalent FAA-approved serviceable bolts and washers, in lieu of using only P/N B-3339 bolts and P/N A-2048-2 washers. \n\nCorrection of Petrolated Graphite Military Specification Number \n\n\tWe have corrected the Petrolated Graphite Military Specification number in the compliance section from MIL-T-5544 to MIL-T-83483. \n\n\tWe have carefully reviewed the availabledata, including the comment received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We have determined that these changes will neither increase the economic burden on any operator nor increase the scope of the AD. \n\nCosts of Compliance \n\n\tThere are about 17,000 Hartzell Propeller Inc. models HC-B3TN-2, HC-B3TN-3, HC-B3TN-5, HC-B4TN-3, HC-B4TN-5, HC-B4MN-5, and HC-B5MP-3 turbopropellers of the affected design in the worldwide fleet. We estimate that 11,900 turbopropellers installed on airplanes of U.S. registry would be affected by this AD. We also estimate that all of these propellers likely have upgraded to the P/N B-3339 bolts and P/N A-2048-2 washers, or equivalent FAA-approved serviceable bolts and washers, since issuance of the original AD. The average labor rate is $65 per work hour. Bolt and washer replacement will require about 1.5 work hours. Required parts will cost about $260 per propeller. Based onthese figures, we estimate the total cost of the AD to replace the bolts and washers for all 11,900 turbopropellers, to be $4,248,300. \n\nAuthority for This Rulemaking \n\n\tTitle 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's authority. \n\n\tWe are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, "General requirements." Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. \n\nRegulatory Analysis \n\n\tThis final rule does not have federalism implications, as defined in Executive Order 13132, because it would not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. Accordingly, the FAA has not consulted with state authorities prior to publication of this final rule. \n\n\tFor the reasons discussed above, I certify that this action (1) is not a "significant regulatory action" under Executive Order 12866; (2) is not a "significant rule" under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES. \n\nList of Subjects in 14 CFR Part 39 \n\n\tAir transportation, Aircraft, Aviation safety, Safety. \n\nAdoption of the Amendment \n\nAccordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: \n\nPART 39--AIRWORTHINESS DIRECTIVES \n\n 1. The authority citation for part 39 continues to read as follows: \n\n\tAuthority: 49 U.S.C. 106(g), 40113, 44701. \n\nSec. 39.13 (Amended) \n\n2. Section 39.13 is amended by removing Amendment 39-4633 (48 FR 17576, April 25, 1983) and by adding a new airworthiness directive, Amendment 39-14043, to read as follows: