The FAA proposed to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) with an AD to supersede AD 2001-14-06, amendment 39-12316 (66 FR 36445, July 12, 2001). The existing AD applies to all Boeing Model 737-300, -400, and -500 series airplanes. The proposed AD was published in the Federal Register on November 5, 2004 (69 FR 64539), to mandate a modification of the electrical connectors located in the main wheel well. \n\nComments \n\n\tWe provided the public the opportunity to participate in the development of this AD. We have considered the comments that have been submitted on the proposed AD. One commenter, the airplane manufacturer, concurs with the contents of the proposed AD. \n\nRequest to Change Preamble \n\n\tOne commenter states that the wrong AD number is referenced in the "Differences Between Proposed AD and Service Bulletin" section in the preamble of the proposed AD. The commenter notes that AD 2001-14-16 was referenced, but the correct AD number is AD 2001-14-06. \n\n\tWe acknowledge and agree with the commenter's remarks, in that there was a typographical error in the referenced section of the preamble of the proposed AD; however, that section is not restated in this final rule. \n\nObservation on Costs of Compliance Section \n\n\tOne commenter states that the modification identified in Boeing Special Attention Service Bulletin 737-28-1196, Revision 3, dated April 1, 2004 (referenced as the appropriate source of service information for accomplishing the proposed modification), has been accomplished on all of its Model 737-300 and -500 series airplanes. The commenter adds that the Accomplishment Instructions in the service bulletin specify approximately 15 man hours or 10 elapsed hours per airplane (including the operational tests) for accomplishing the modification, which is the amount of time the commenter used to accomplish the modification. The commenter does not provide a specific request. \n\nConclusionWe have carefully reviewed the available data, including the comments that have been submitted, and determined that air safety and the public interest require adopting the AD as proposed. \n\nCosts of Compliance \n\n\tThere are about 1,974 Model 737-300, -400, and -500 airplanes worldwide of the affected design. This AD affects about 755 airplanes of U.S. registry. \n\n\tThe new modification (including the operational tests) takes about 9 work hours per airplane, at an average labor rate of $65 per work hour. Required parts cost is minimal. Based on these figures, the estimated cost of the modification specified in this AD for U.S. operators is $441,675, or $585 per airplane. \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\tWeare 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 Findings \n\n\tWe have determined that this AD will not have federalism implications under Executive Order 13132. This AD will 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. \n\n\tFor the reasons discussed above, I certify that this AD: \n\n\t(1) Is not a "significant regulatory action" under Executive Order 12866; \n\n\t(2) Is not a "significant rule" under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and \n\n\t(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. \n\n\tWe prepared a regulatory evaluation of the estimated costs to comply with this AD. See the ADDRESSES section for a location to examine the regulatory evaluation. \n\nList of Subjects in 14 CFR Part 39 \n\n\tAir transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. \n\nAdoption of the Amendment \n\nAccordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: \n\nPART 39--AIRWORTHINESS DIRECTIVES \n\n1. 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. The FAA amends Sec. 39.13 byremoving amendment 39-12316 (66 FR 36445, July 12, 2001) and by adding the following new airworthiness directive (AD):