Two operators of Boeing Model 747-400 series airplanes equipped with Rolls Royce engines have reported five incidents of worn engine fuel feed tubes found in the engine struts. In each case, the worn tube was found to be touching the engine power feeder cable conduit in the front of the engine strut. This touching created worn (chafed) areas on the fuel tubes; the worn areas were between 0.0055 and 0.014 inch deep. Investigation revealed that the currently-installed bracket and clamps for the power feeder conduit allow the conduit to rotate and consequently come into contact with the engine fuel feed tube. If this is not prevented, the conduit can wear a hole in the fuel tube, which could result in a fuel leak in the forward strut area. A fuel leak such as this, if not corrected, could pose a fire hazard. \n\n\tBoeing has issued Alert Service Bulletin 747-28A2190, dated March 23, 1995, which describes procedures for inspecting the fuel tube in each strut for wear or damage, and repairing it, if necessary. It also describes procedures for installing a new support bracket and two new clamps on the power feeder conduit in all four engine struts. The service bulletin also describes procedures for inspecting the power feeder conduit for proper positioning, and adjusting it to obtain maximum clearance between it and the fuel tube. \n\n\tSince an unsafe condition has been identified that is likely to exist or develop on other airplanes of the same type design, this AD is being issued to prevent a fuel leak in the forward engine strut. This AD requires (1) an inspection for wear of the fuel tube in the forward engine strut, and repair, if necessary; (2) the installation of a new support bracket and two new clamps on the power feeder conduit; and (3) an inspection for proper positioning of the power feeder conduit, and adjustment, if necessary. The actions are required to be accomplished in accordance with the service bulletin described previously. \n\n\tNone of the Model 747-400 series airplanes affected by this action are on the U.S. Register. All airplanes included in the applicability of this rule currently are operated by non-U.S. operators under foreign registry; therefore, they are not directly affected by this AD action. However, the FAA considers that this rule is necessary to ensure that the unsafe condition is addressed in the event that any of these subject airplanes are imported and placed on the U.S. Register in the future. \n\n\tShould an affected airplane be imported and placed on the U.S. Register in the future, it would require approximately 8 work hours to accomplish the required actions, at an average labor charge of $60 per work hour. The cost of required parts would be $368 per airplane. Based on these figures, the cost impact of this AD would be $848 per airplane. \n\n\tSince this AD action does not affect any airplane that is currently on the U.S. register, it has no adverse economic impact andimposes no additional burden on any person. Therefore, notice and public procedures hereon are unnecessary and the amendment may be made effective in less than 30 days after publication in the Federal Register.\n\n Comments Invited \n\n\tAlthough this action is in the form of a final rule and was not preceded by notice and opportunity for public comment, comments are invited on this rule. Interested persons are invited to comment on this rule by submitting such written data, views, or arguments as they may desire. Communications shall identify the Rules Docket number and be submitted in triplicate to the address specified under the caption "ADDRESSES." All communications received on or before the closing date for comments will be considered, and this rule may be amended in light of the comments received. Factual information that supports the commenter's ideas and suggestions is extremely helpful in evaluating the effectiveness of the AD action and determining whether additional rulemaking action would be needed. \n\n\tComments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify the rule. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. A report that summarizes each FAA-public contact concerned with the substance of this AD will be filed in the Rules Docket. \n\n\tCommenters wishing the FAA to acknowledge receipt of their comments submitted in response to this rule must submit a self-addressed, stamped postcard on which the following statement is made: "Comments to Docket Number 95-NM-274-AD." The postcard will be date stamped and returned to the commenter. \n\n\tThe regulations adopted herein will not have substantial direct effects 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. Therefore, in accordance with Executive Order 12612, it is determined that this final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment. \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 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 from the Rules Docket at the location provided under the caption "ADDRESSES."\n\n List of Subjects in 14 CFR Part 39 \n\n\tAir transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. \n\nAdoption ofthe Amendment \n\n\tAccordingly, 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\n PART 39 - AIRWORTHINESS DIRECTIVES \n\n\t1. The authority citation for part 39 continues to read as follows: Authority: 49 USC 106(g), 40113, 44701. § 39.13 - (Amended) \n\n\t2. Section 39.13 is amended by adding the following new airworthiness directive: