[Federal Register Volume 63, Number 142 (Friday, July 24, 1998)] [Proposed Rules] [Pages 39769-39771] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 98-19778] ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 97-NM-106-AD] RIN 2120-AA64 Airworthiness Directives; Short Brothers Model SD3-60 and SD3-60 SHERPA Series Airplanes AGENCY: Federal Aviation Administration, DOT. ACTION: Supplemental notice of proposed rulemaking; reopening of comment period. ----------------------------------------------------------------------- SUMMARY: This document revises an earlier proposed airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 series airplanes, that would have required repetitive inspections to detect corrosion and/or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the main landing gear (MLG), and repair, if necessary. That proposal was prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. This new action revises the proposed rule by expanding the applicability to include an additional airplane model. The actions specified by this new proposed AD are intended to detect and correct corrosion and/or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the MLG, which could result in failure of the MLG to extend or retract. DATES: Comments must be received by August 18, 1998. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-114, Attention: Rules Docket No. 97-NM-106-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 Short Brothers, Airworthiness & Engineering Quality, P. O. Box 241, Airport Road, Belfast BT3 9DZ, Northern Ireland. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. FOR FURTHER INFORMATION CONTACT: Norman B. Martenson, Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 227-2110; fax (425) 227-1149. 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 97-NM-106-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. 97-NM-106-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. Discussion A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to add an airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 series airplanes, was published as a notice of proposed rulemaking (NPRM) in the Federal Register on October 6, 1997 (62 FR 52053). That NPRM would have required repetitive inspections to detect corrosion and/or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the main landing gear (MLG), and repair, if necessary. That NPRM was prompted by reports of corrosion and/or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the MLG. Such corrosion or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the MLG, if not corrected, could result in failure of the MLG to extend or retract. Actions Since Issuance of Previous Proposal Since the issuance of that NPRM, the Civil Aviation Authority (CAA), which is the airworthiness authority for the United Kingdom, notified the FAA that the unsafe condition described in the original NPRM also may exist on all Short Brothers Model SD3-60 SHERPA series airplanes. The shear decks of the stub wings on Model SD3-60 SHERPA series airplanes are similar in design to those on Model SD3-60 series airplanes; therefore, both models are subject to the same unsafe condition. The FAA has revised the applicability of this [[Page 39770]] supplemental NPRM to add Model SD3-60 SHERPA series airplanes. New Service Information Short Brothers has issued Service Bulletin SD3-60 SHERPA-53-3, dated November 4, 1997, which describes procedures for repetitive inspections to detect corrosion and/or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the MLG, and repair, if necessary. For airplanes on which certain depths of corrosion or wear is detected, the service bulletin describes procedures for a visual inspection to detect any discrepancy of the pintle pin and sleeve. The CAA classified this service bulletin as mandatory and issued British airworthiness directive 005-11-97 in order to assure the continued airworthiness of these airplanes in the United Kingdom. The FAA has revised this supplemental NPRM to reference this service bulletin as the appropriate source of service information for accomplishment of the actions proposed by this AD for Model SD3-60 SHERPA series airplanes. Explanation of Change Made to NPRM In the original NPRM, the FAA inadvertently omitted a paragraph requiring operators to repeat the inspection for corrosion of the top and bottom shear decks of the left and right stub wings at intervals not to exceed 6 months even if no corrosion, wear, or discrepancy of the measurement of the holes for the retaining pin of the pintle pin is found. Accordingly, the FAA has included this requirement in paragraph (a)(1) of this supplemental NPRM. Conclusion Since these changes expand the scope of the originally proposed rule, the FAA has determined that it is necessary to reopen the comment period to provide additional opportunity for public comment. Cost Impact The FAA estimates that 58 Model SD3-60 series airplanes and 28 Model SD3-60 SHERPA series airplanes of U.S. registry would be affected by this proposed AD, that it would take approximately 13 work hours per airplane to accomplish the proposed actions, and that the average labor rate is $60 per work hour. Based on these figures, the total cost impact of the proposed AD on U.S. operators is estimated to be $67,080, or $780 per airplane, per inspection cycle. 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: Short Brothers PLC: Docket 97-NM-106-AD. Applicability: All Model SD3-60 and SD3-60 SHERPA series airplanes, 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 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 detect and correct corrosion and/or wear of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the main landing gear (MLG), which could result in failure of the MLG to extend or retract, accomplish the following: (a) Within 90 days after the effective date of this AD, conduct an inspection for corrosion of the top and bottom shear decks of the left and right stub wings in the area of the forward pintle pin of the MLG, and measure the retaining pin holes of the pintle pin for wear; in accordance with Part A. of the Accomplishment Instructions of Short Brothers Service Bulletin SD360-53-42, dated September 1996 (for Model SD3-60 series airplanes), or Short Brothers Service Bulletin SD3-60 SHERPA-53-3, dated November 4, 1997 (for Model SD3- 60 SHERPA series airplanes), as applicable. (1) If no corrosion, wear, or discrepancy of the measurement of the holes for the retaining pin of the pintle pin is found, repeat the inspection required by paragraph (a) of this AD thereafter at intervals not to exceed 6 months. (2) If any corrosion, wear, or measurement of the holes for the retaining pin of the pintle pin is found that is within the limits specified in Part A. of the Accomplishment Instructions of the applicable service bulletin, prior to further flight, repair the discrepancy in accordance with the applicable service bulletin. Thereafter, repeat the inspection required by paragraph (a) of this AD at intervals not to exceed 6 months. (3) If any corrosion, wear, or measurement of the holes for the retaining pin of the pintle pin is found that is beyond the limits specified in Part A. of the Accomplishment Instructions of the applicable service bulletin, prior to further flight, perform the actions required by paragraph (a)(3)(i) and (a)(3)(ii) of this AD. (i) Remove the corrosion and install bushings on the upper and lower shear webs in the retaining pin holes for the pintle pin in accordance with Part B. (left MLG) and/or Part C. (right MLG), as applicable, of the Accomplishment Instructions of the applicable service bulletin. (ii) Perform a visual inspection of the pintle pin and the sleeve for any discrepancy, in accordance with Part B. and/or Part C., as applicable, of the Accomplishment Instructions of the applicable service bulletin. [[Page 39771]] (A) If no discrepancy is detected, the pintle pin and the sleeve of the pintle pin may be returned to service. (B) If any discrepancy of the pintle pin and sleeve is detected, prior to further flight, repair the pintle pin and sleeve in accordance with a method approved by the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate. (b) Removal of corrosion and installation of bushings in accordance with Part B. and/or Part C., as applicable, of the Accomplishment Instructions of Short Brothers Service Bulletin SD360-53-42, dated September 1996 (for Model SD3-60 series airplanes), or Short Brothers Service Bulletin SD3-60 SHERPA-53-3, dated November 4, 1997 (for Model SD3-60 SHERPA series airplanes), as applicable, constitutes terminating action for the repetitive inspection requirements of this AD. (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, International Branch, ANM-116. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, International Branch, ANM-116. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116. (d) Special flight permits may be issued in accordance with Secs. 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. Note 3: The subject of this AD is addressed in British airworthiness directives 005-09-96 and 005-11-97. Issued in Renton, Washington, on July 20, 1998. S. R. Miller, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-19778 Filed 7-23-98; 8:45 am] BILLING CODE 4910-13-U