The FAA proposed to amend 14 CFR part 39 with an AD for certain Boeing Model 757-200 series airplanes. That action, published in the Federal Register on December 28, 2004 (69 FR 77675), proposed to require modifying the wiring of the test ground signal for the master dim and test system circuit in the flight compartment. \n\nComments \n\n\tWe provided the public the opportunity to participate in the development of this AD. We have considered the comment that has been submitted on the proposed AD. The commenter supports the proposed AD. \n\nClarification of Applicability \n\n\tIn paragraph (c) of the proposed AD we inadvertently specified "certain Boeing Model 757-200 series airplanes" without identifying the affected group. These airplanes are identified in Boeing Service Bulletin 757-33-0050, Revision 2, dated December 4, 2003. We have revised the final rule to clarify that applicability. \n\nEditorial Change \n\n\tThe FAA noted that in paragraph (g) of the proposed AD, reference was made to Boeing Service Bulletin 757-33-0050. We have revised that reference to read Boeing Special Attention Service Bulletin 757-33- 0050. \n\nConclusion \n\n\tWe have carefully reviewed the available data, including the comment that has been submitted, 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 55 airplanes of the affected design worldwide, and 30 airplanes of U.S. registry. The required modification (including the operational test) will take between 2 and 3 work hours, depending on the airplane configuration, at an average labor rate of $65 per work hour. Required parts cost will be minimal. Based on these figures, the estimated cost of the required modification for U.S. operators is between $130 and $195 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\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 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 by adding the following new airworthiness directive (AD):