[Federal Register Volume 60, Number 173 (Thursday, September 7, 1995)] [Proposed Rules] [Pages 46542-46544] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 95-22211] ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION 14 CFR Part 39 [Docket No. 95-NM-53-AD] Airworthiness Directives; Boeing Model 747-400 Series Airplanes AGENCY: Federal Aviation Administration, DOT. ACTION: Notice of proposed rulemaking (NPRM). ----------------------------------------------------------------------- SUMMARY: This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 747- 400 series airplanes, [[Page 46543]] that currently requires replacement of electrical wiring to the fuel shutoff valve for each engine. This action would require replacement of the fuel shutoff valve wire and sleeve with a wire in two non-metallic sleeves in the conduit in the struts of each engine. This proposal is prompted by reports of additional occurrences of chafing and shorting of the wiring of the engine fuel shutoff valves. The actions specified by the proposed AD are intended to prevent such chafing and shorting, which could result in the pilot's inability to shut off the supply of fuel in the event of an engine fire. DATES: Comments must be received by November 1, 1995. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-103, Attention: Rules Docket No. 95-NM-53-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. Comments may be inspected at this location between 9:00 a.m. and 3:00 p.m., Monday through Friday, except Federal holidays. The service information referenced in the proposed rule may be obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124-2207. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. FOR FURTHER INFORMATION CONTACT: Stephen Oshiro, Aerospace Engineer, Systems and Equipment Branch, ANM-130S, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206) 227-2793; fax (206) 227-1181. SUPPLEMENTARY INFORMATION: Comments Invited Interested persons are invited to participate in the making of the proposed 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 above. All communications received on or before the closing date for comments, specified above, will be considered before taking action on the proposed rule. The proposals contained in this notice may be changed in light of the comments received. Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the proposed 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 summarizing each FAA-public contact concerned with the substance of this proposal will be filed in the Rules Docket. Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must submit a self-addressed, stamped postcard on which the following statement is made: ``Comments to Docket Number 95-NM-53-AD.'' The postcard will be date stamped and returned to the commenter. Availability of NPRMs Any person may obtain a copy of this NPRM by submitting a request to the FAA, Transport Airplane Directorate, ANM-103, Attention: Rules Docket No. 95-NM-53-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. Discussion On June 12, 1989, the FAA issued AD 89-14-04, amendment 39-6246 (54 FR 27157, June 28, 1989), applicable to certain Boeing Model 747-400 series airplanes, to require replacement of electrical wiring to the fuel shutoff valve for each engine. That action was prompted by reports of the fuel shutoff valve wiring shorting to the surrounding electrical conduit, which resulted in circuit breaker tripping and inability to operate the associated fuel shutoff valve. The requirements of that AD are intended to preserve the pilot's ability to shut off the supply of fuel in the event of an engine fire. Since the issuance of that AD, the FAA has received reports of additional occurrences of chafing and shorting of the wiring of the engine fuel shutoff valves on Model 747-400 series airplanes. Subsequently, Boeing developed a new installation consisting of a wire in two sleeves (non-metallic, open weave braided sleeve inside industrial wall thickness teflon) that will improve the protection of the fuel shutoff valve wire. The FAA has reviewed and approved Boeing Alert Service Bulletin 747-28A2186, dated January 19, 1995, which describes procedures for replacement of the fuel shutoff valve wire and sleeve with a wire in two non-metallic sleeves in the conduit in the struts of each engine. The FAA has determined that accomplishment of this replacement of the fuel shutoff valve wire and sleeve with a wire with two non- metallic sleeves in the conduit in the struts of each engine will positively address the unsafe condition identified as inability to shut off the supply of fuel to an engine. Since an unsafe condition has been identified that is likely to exist or develop on other products of this same type design, the proposed AD would supersede AD 89-14-04 to require replacement of the wire and sleeve with a single wire in two non-metallic sleeves in the conduit in the struts of each engine. The actions would be required to be accomplished in accordance with the alert service bulletin described previously. The modification that was previously required by AD 89-14-04 will effectively be removed when the modification required by this proposed AD is installed. Additionally, those airplanes on which the previously- required modification had not been accomplished will require no additional work with the installation of the new proposed modification. As a result of recent communications with the Air Transport Association (ATA) of America, the FAA has learned that, in general, some operators may misunderstand the legal effect of AD's on airplanes that are identified in the applicability provision of the AD, but that have been altered or repaired in the area addressed by the AD. The FAA points out that all airplanes identified in the applicability provision of an AD are legally subject to the AD. If an airplane has been altered or repaired in the affected area in such a way as to affect compliance with the AD, the owner or operator is required to obtain FAA approval for an alternative method of compliance with the AD, in accordance with the paragraph of each AD that provides for such approvals. A note has been included in this notice to clarify this long-standing requirement. There are approximately 311 Model 747-400 series airplanes of the affected design in the worldwide fleet. The FAA estimates that 38 airplanes of U.S. registry would be affected by this proposed AD, that it would take approximately 80 work hours per airplane to accomplish the proposed actions, and that the average labor rate is $60 per work hour. Required parts would cost approximately $673 per airplane. Based on these figures, the total cost impact of the proposed AD on U.S. operators is estimated to be $207,974, or $5,473 per airplane. The total cost impact figure discussed above is based on assumptions that no operator has yet accomplished any of the proposed requirements of this AD action, and that no operator would accomplish those actions in the future if this AD were not adopted. [[Page 46544]] The regulations proposed herein would 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 proposal would not have sufficient federalism implications to warrant the preparation of a Federalism Assessment. For the reasons discussed above, I certify that this proposed regulation (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) if promulgated, 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 copy of the draft regulatory evaluation prepared for this action 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: PART 39--AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40101, 40113, 44701. Sec. 39.13 [Amended] 2. Section 39.13 is amended by removing amendment 39-6246 (54 FR 27157, June 28, 1989), and by adding a new airworthiness directive (AD), to read as follows: Boeing: Docket 95-NM-53-AD. Supersedes AD 89-14-04, Amendment 39- 6246. Applicability: Model 747-400 series airplanes; line positions 696 through 1046 inclusive, except airplane variable numbers RT502 and RU032 (airplane serial numbers 24062 and 25780, respectively); certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (b) to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD. Compliance: Required as indicated, unless accomplished previously. To prevent the inability to shut off the supply of fuel in the event of an engine fire, accomplish the following: (a) Within 12 months after the effective date of this AD, replace the fuel shutoff valve wire and sleeve with a wire in two non-metallic sleeves in the conduit in the struts of each engine, in accordance with Boeing Alert Service Bulletin 747-28A2186, dated January 19, 1995. Note 2: Replacements accomplished prior to the effective date of this amendment in accordance with Boeing Alert Service Bulletin 747- 54A2157, dated January 12, 1995, or Revision 1, dated August 3, 1995; or Boeing Alert Service Bulletin 747-54A2156, dated December 15, 1994, or Revision 1, dated July 20, 1995; are considered acceptable for compliance with the replacements specified in this amendment. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Seattle ACO. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. (c) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. Issued in Renton, Washington, on August 31, 1995. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 95-22211 Filed 9-6-95; 8:45 am] BILLING CODE 4910-13-U