Federal Register/Vol. 86, No. 142/Wednesday, July 28, 2021
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Federal Register / Vol. 86, No. 142 / Wednesday, July 28, 2021 / Proposed Rules 40379 is being withdrawn, the commenters’ ADDRESSES: You may send comments, following paragraph, and other requests are no longer necessary. using the procedures found in 14 CFR information as described in 14 CFR Withdrawal of the NPRM constitutes 11.43 and 11.45, by any of the following 11.35, the FAA will post all comments only such action and does not preclude methods: received, without change, to https:// the FAA from further rulemaking on • Federal eRulemaking Portal: Go to www.regulations.gov, including any this issue, nor does it commit the FAA https://www.regulations.gov. Follow the personal information you provide. The to any course of action in the future. instructions for submitting comments. agency will also post a report • Fax: (202) 493–2251. summarizing each substantive verbal Regulatory Findings • Mail: U.S. Department of contact received about this NPRM. Since this action only withdraws an Transportation, Docket Operations, M– Confidential Business Information NPRM, it is neither a proposed AD nor 30, West Building Ground Floor, Room a final rule. This action, therefore, is not W12–140, 1200 New Jersey Avenue SE, CBI is commercial or financial covered under Executive Order 12866 or Washington, DC 20590. information that is both customarily and the Regulatory Flexibility Act. • Hand Delivery: Deliver to Mail actually treated as private by its owner. Under the Freedom of Information Act List of Subjects in 14 CFR Part 39 address above between 9 a.m. and 5 p.m., Monday through Friday, except (FOIA) (5 U.S.C. 552), CBI is exempt Air transportation, Aircraft, Aviation Federal holidays. from public disclosure. If your safety, Incorporation by reference, For service information identified in comments responsive to this NPRM Safety. this NPRM, contact Learjet Inc., One contain commercial or financial information that is customarily treated The Withdrawal Learjet Way, Wichita, KS 67209; phone: (316) 946–2000; email: ac.ict@ as private, that you actually treat as ■ Accordingly, the notice of proposed aero.bombardier.com; website: https:// private, and that is relevant or rulemaking, which published in the businessaircraft.bombardier.com/en/ responsive to this NPRM, it is important Federal Register on July 27, 2018 (83 FR aircraft/Learjet.html. You may view this that you clearly designate the submitted 35568), is withdrawn. referenced service information at the comments as CBI. Please mark each FAA, Airworthiness Products Section, page of your submission containing CBI Issued on July 21, 2021. as ‘‘PROPIN.’’ The FAA will treat such Gaetano A. Sciortino, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information marked submissions as confidential Deputy Director for Strategic Initiatives, under the FOIA, and they will not be Compliance & Airworthiness Division, on the availability of this material at the FAA, call (816) 329–4148. placed in the public docket of this Aircraft Certification Service. NPRM. Submissions containing CBI [FR Doc. 2021–15952 Filed 7–27–21; 8:45 am] Examining the AD Docket should be sent to Tara Shawn, Aviation BILLING CODE 4910–13–P You may examine the AD docket at Safety Engineer, Wichita ACO Branch, https://www.regulations.gov by FAA, 1801 Airport Road, Wichita, KS 67209. Any commentary that the FAA DEPARTMENT OF TRANSPORTATION searching for and locating Docket No. FAA–2021–0157; or in person at Docket receives which is not specifically Federal Aviation Administration Operations between 9 a.m. and 5 p.m., designated as CBI will be placed in the Monday through Friday, except Federal public docket for this rulemaking. 14 CFR Part 39 holidays. The AD docket contains this Background NPRM, any comments received, and In December 2018, the FAA received [Docket No. FAA–2021–0157; Project other information. The street address for a report from Learjet of corrosion found Identifier AD–2020–00483–T] Docket Operations is listed above. in the center wing area of a Model 45 FOR FURTHER INFORMATION CONTACT: Tara RIN 2120–AA64 (Learjet 45) airplane. Exfoliating Shawn, Aviation Safety Engineer, corrosion was found on the upper Airworthiness Directives; Learjet Inc. Wichita ACO Branch, FAA, 1801 surface of the lower center wing mid Airport Road, Wichita, KS 67209; spar splice plate during unrelated AGENCY: Federal Aviation phone: (316) 946–4141; fax: (316) 946– maintenance. The corrosion appeared to Administration (FAA), DOT. 4107; email: [email protected]. extend half way through the thickness ACTION: Notice of proposed rulemaking SUPPLEMENTARY INFORMATION: of the splice plate. Since the initial (NPRM). Comments Invited report, the FAA has received 23 additional reports of corrosion from SUMMARY: The FAA proposes to adopt a The FAA invites you to send any Learjet. The FAA determined areas of new airworthiness directive (AD) for written relevant data, views, or the wing center section are not sealed certain Learjet Inc. (Learjet) Model 45 arguments about this proposal. Send against the elements; in addition, the airplanes. This proposed AD was your comments to an address listed fuselage has drain holes that allow prompted by reports of corrosion found under ADDRESSES. Include ‘‘Docket No. condensation to drain into the center on the upper surface of the lower center FAA–2021–0157; Project Identifier AD– wing. The accumulation and retention wing mid spar splice plate. This 2020–00483–T’’ at the beginning of your of moisture in the center wing section proposed AD would require repetitively comments. The most helpful comments may lead to corrosion. This condition, if inspecting the center wing area for reference a specific portion of the not addressed, could result in failure of corrosion and deterioration of protective proposal, explain the reason for any the wing centerline joint and lead to treatments, removing any corrosion, and recommended change, and include partial wing separation with consequent treating any deteriorated areas. The FAA supporting data. The FAA will consider loss of control of the airplane. is proposing this AD to address the all comments received by the closing unsafe condition on these products. date and may amend this proposal FAA’s Determination DATES: The FAA must receive comments because of those comments. The FAA is issuing this NPRM after on this proposed AD by September 13, Except for Confidential Business determining that the unsafe condition 2021. Information (CBI) as described in the described previously is likely to exist or VerDate Sep<11>2014 16:59 Jul 27, 2021 Jkt 253001 PO 00000 Frm 00011 Fmt 4702 Sfmt 4702 E:\FR\FM\28JYP1.SGM 28JYP1 khammond on DSKJM1Z7X2PROD with PROPOSALS 40380 Federal Register / Vol. 86, No. 142 / Wednesday, July 28, 2021 / Proposed Rules develop on other products of the same As applicable to the model course of business or by the means type design. configuration specified, each service identified in the ADDRESSES. bulletin contains procedures for Related Service Information Under 1 inspecting for corrosion and Proposed AD Requirements in This CFR Part 51 deterioration of protective treatments of NPRM The FAA reviewed the following the center wing area from the front spar This proposed AD would require service documents proposed for to the rear spar between wing stations accomplishing the actions specified in compliance with this NPRM: 33.00L to 33.00R, treating deteriorated • the service information already Bombardier Learjet 40 Service areas, and removing any corrosion. described. This proposed AD would Bulletin 40–57–06, Revision 1, dated Bombardier Learjet 75 Service Bulletin also require reporting the inspection October, 26, 2020; 75–57–01, Revision 2, dated April 19, • results to the FAA by email at Wichita- Bombardier Learjet 45 Service 2021, does not apply to newly- [email protected]. Bulletin 45–57–13, Revision 1, dated manufactured airplanes, since Learjet October, 26, 2020; added this inspection to the Costs of Compliance • Bombardier Learjet 70 Service Airworthiness Limitation Section, Bulletin 70–57–02, Revision 1, dated which will be delivered with new The FAA estimates that this AD, if October, 26, 2020; and airplanes starting at S/N 45–597. adopted as proposed, would affect 450 • Bombardier Learjet 75 Service This service information is reasonably airplanes of U.S. registry. Bulletin 75–57–01, Revision 2, dated available because the interested parties The FAA estimates the following April 19, 2021. have access to it through their normal costs to comply with this proposed AD: ESTIMATED COSTS Cost per Cost on U.S. Action Labor cost Parts cost product operators Inspection .......................... 7.50 work-hours × $85 per hour = $637.50 .............. Not applicable .................. $637.50 $286,875 Reporting to FAA .............. 1 work-hour × $85 per hour = $85 ............................ Not applicable .................. 85 38,250 The extent of corrosion and estimate or any other aspect of this States, on the relationship between the deterioration of protective treatments collection of information, including national government and the States, or may vary significantly from airplane to suggestions for reducing this burden, to: on the distribution of power and airplane. The FAA has no way of Information Collection Clearance responsibilities among the various determining how much damage may be Officer, Federal Aviation levels of government. found on each airplane, the cost to Administration, 10101 Hillwood For the reasons discussed above,