[Federal Register Volume 64, Number 167 (Monday, August 30, 1999)] [Proposed Rules] [Pages 47144-47146] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 99-22393] ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 99-NM-186-AD] RIN 2120-AA64 Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, - 30, -40, and -50 Series Airplanes, and C-9 (Military) Airplanes AGENCY: Federal Aviation Administration, DOT. ACTION: Notice of proposed rulemaking (NPRM). ----------------------------------------------------------------------- SUMMARY: This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes, and C-9 (military) airplanes. This proposal would require a one-time general visual inspection to detect certain discrepancies in the wiring of the fuel quantity indicating system (FQIS) in the forward cargo compartment; and corrective actions, if necessary. This proposal is prompted by a report indicating that several discrepancies were found in the wiring of the FQIS due to maintenance or alteration practices. The actions specified by the proposed AD are intended to prevent excessive electrical energy from entering the fuel tanks through the FQIS wiring, which could result in a potential ignition source in the fuel tanks. DATES: Comments must be received by October 14, 1999. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-114, Attention: Rules Docket No. 99-NM-186-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 Aircraft Group, Long Beach Division, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Technical Publications Business Administration, Dept. C1-L51 (2-60). This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California. FOR FURTHER INFORMATION CONTACT: Robert Baitoo, Aerospace Engineer, Propulsion Branch, ANM-140L, FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137; telephone (562) 627-5245; fax (562) 627-5210. 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 [[Page 47145]] 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 99-NM-186-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-114, Attention: Rules Docket No. 99-NM-186-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. Discussion The FAA has received a report indicating that, during an inspection of 12 randomly selected McDonnell Douglas DC-9 series airplanes, certain discrepancies were found in the wiring of the fuel quantity indicating system (FQIS) in the forward cargo compartment area due to maintenance or alteration practices. These discrepancies include missing, loosely installed, or incorrectly sized wiring run attachment clamps; FQIS wiring that is string-tied in direct contact with other airplane wiring; and non-FQIS wires routed with the FQIS segmented conduit. Such conditions, if not corrected, could permit the wires to chafe against each other, which could permit excessive electrical energy to enter the fuel tanks through the FQIS wiring. This condition could result in a potential ignition source in the fuel tanks. Explanation of Relevant Service Information The FAA has reviewed and approved McDonnell Douglas Service Bulletin DC9-28-077, dated June 8, 1999, which describes procedures for a one-time visual inspection to detect discrepancies (i.e., missing, loosely installed, or incorrectly sized wiring run attachment clamps; FQIS wiring that is string-tied in direct contact with other airplane wiring; and non-FQIS wires routed with the FQIS segmented conduit) in the wiring of the FQIS, and repairing or rerouting the wires, if necessary. Accomplishment of the action specified in the service bulletin is intended to adequately address the identified unsafe condition. Explanation of Requirements of Proposed Rule 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 require accomplishment of the actions specified in the service bulletin described previously, except as discussed below. The proposed AD also would require that operators report results of inspection findings to the FAA. Differences Between Proposed Rule and Service Information Operators should note that, although the service bulletin recommends accomplishing the visual inspection at the earliest practical heavy maintenance period (after the release of the service bulletin), the FAA has determined that such an interval would not address the identified unsafe condition in a timely manner. In developing an appropriate compliance time for this AD, the FAA considered not only the manufacturer's recommendation, but the degree of urgency associated with addressing the subject unsafe condition, the average utilization of the affected fleet, and the time necessary to perform the inspection (less than one hour). In light of all of these factors, the FAA finds an 18-month compliance time for initiating the required actions to be warranted, in that it represents an appropriate interval of time allowable for affected airplanes to continue to operate without compromising safety. Additionally, operators should note that, although the service bulletin specifies that the inspection findings should be sent to the manufacturer, this proposal would require the inspection findings to be sent to the FAA. Cost Impact There are approximately 815 airplanes of the affected design in the worldwide fleet. The FAA estimates that 577 airplanes of U.S. registry would be affected by this proposed AD, that it would take approximately 1 work hour per airplane to accomplish the proposed inspection, and that the average labor rate is $60 per work hour. Based on these figures, the cost impact of the proposed AD on U.S. operators is estimated to be $34,620, or $60 per airplane. The 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. Regulatory Impact 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), 40113, 44701. Sec. 39.13 [Amended] 2. Section 39.13 is amended by adding the following new airworthiness directive: McDonnell Douglas: Docket 99-NM-186-AD. Applicability: Model DC-9-10, -20, -30, -40, and -50 series airplanes, and C-9 (military) airplanes; as listed in McDonnell Douglas Service Bulletin DC9-28-077, dated June 8, 1999; 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 [[Page 47146]] owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance: Required as indicated, unless accomplished previously. To prevent excessive electrical energy from entering the fuel tanks through the fuel quantity indicating system (FQIS) wiring, which could result in a potential ignition source in the fuel tanks, accomplish the following: Inspection and Corrective Actions (a) Within 18 months after the effective date of this AD, perform a one-time general visual inspection to detect discrepancies in the wiring of the FQIS in the area of the forward cargo compartment in accordance with McDonnell Douglas Service Bulletin DC9-28-077, dated June 8, 1999. If any discrepancy is detected, prior to further flight, perform the corrective actions specified in the service bulletin, except as provided in paragraph (b) of this AD. Note 2: For the purposes of this AD, a general visual inspection is defined as ``A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.'' Reporting Requirement (b) Where the service bulletin specifies to submit a report of inspection findings to Boeing: Within 10 days after accomplishing the inspection required by paragraph (a) of this AD, submit a report of the inspection results (both positive and negative findings) to the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate, 3960 Paramount Boulevard, Lakewood, California 90712-4137; ATTN: Robert Baitoo; fax (562) 627-5210. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120- 0056. Note 3: Accomplishment of the inspection, corrective action, and reporting in accordance with McDonnell Douglas All Operator Letter (AOL) 9-2584, dated February 19, 1999; and Interim DC-9 Forward Cargo Compartment FQIS Inspection and Information Procedure, Revision 1, dated February 11, 1999; is acceptable for compliance with the actions required by paragraphs (a) and (b) of this AD. Alternative Methods of Compliance (c) 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, Los Angeles 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, Los Angeles ACO. Note 4: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. Special Flight Permits (d) 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 23, 1999. Vi L. Lipski, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-22393 Filed 8-27-99; 8:45 am] BILLING CODE 4910-13-P