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is being withdrawn, the commenters’ ADDRESSES: You may send comments, following paragraph, and other requests are no longer necessary.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, , 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 You may view this that you clearly designate the submitted 35568), is withdrawn.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 () 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

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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 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, I remove the corrosion or treat Parkway, Fort Worth, TX 76177–1524. certify this proposed regulation: deteriorated areas (or replacing the part, Authority for This Rulemaking (1) Is not a ‘‘significant regulatory if needed), or the number of airplanes action’’ under Executive Order 12866, that may require repair. Title 49 of the United States Code (2) Would not affect intrastate If corrosion is found and removed, the specifies the FAA’s authority to issue aviation in Alaska, and FAA estimates that it would take 2 rules on aviation safety. Subtitle I, (3) Would not have a significant work-hours per airplane to provide data section 106, describes the authority of economic impact, positive or negative, to Learjet. With an average labor rate of the FAA Administrator. Subtitle VII: on a substantial number of small entities $85 per work-hour, the FAA estimates a Aviation Programs, describes in more under the criteria of the Regulatory cost of $170 per airplane. detail the scope of the Agency’s Flexibility Act. authority. Paperwork Reduction Act The FAA is issuing this rulemaking List of Subjects in 14 CFR Part 39 A federal agency may not conduct or under the authority described in Air transportation, Aircraft, Aviation sponsor, and a person is not required to Subtitle VII, Part A, Subpart III, Section safety, Incorporation by reference, respond to, nor shall a person be subject 44701: General requirements. Under Safety. to a penalty for failure to comply with that section, Congress charges the FAA a collection of information subject to the with promoting safe flight of civil The Proposed Amendment requirements of the Paperwork aircraft in air commerce by prescribing Accordingly, under the authority Reduction Act unless that collection of regulations for practices, methods, and delegated to me by the Administrator, information displays a current valid procedures the Administrator finds the FAA proposes to amend 14 CFR part OMB Control Number. The OMB necessary for safety in air commerce. 39 as follows: Control Number for this information This regulation is within the scope of collection is 2120–0056. Public that authority because it addresses an PART 39—AIRWORTHINESS reporting for this collection of unsafe condition that is likely to exist or DIRECTIVES information is estimated to take up to 3 develop on products identified in this hours per response, including the time rulemaking action. ■ 1. The authority citation for part 39 for reviewing instructions, searching continues to read as follows: Regulatory Findings existing data sources, gathering and Authority: 49 U.S.C. 106(g), 40113, 44701. maintaining the data needed, and The FAA determined that this completing and reviewing the collection proposed AD would not have federalism § 39.13 [Amended] of information. All responses to this implications under Executive Order ■ 2. The FAA amends § 39.13 by adding collection of information are mandatory. 13132. This proposed AD would not the following new airworthiness Send comments regarding this burden have a substantial direct effect on the directive:

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Learjet Inc.: Docket No. FAA–2021–0157; (2) For airplanes that have accumulated (l) Alternative Methods of Compliance Project Identifier AD–2020–00483–T. more than 8 years since the date of issuance (AMOCs) of the original airworthiness certificate or the (a) Comments Due Date (1) The Manager, Wichita ACO Branch, date of issuance of the original export FAA, has the authority to approve AMOCs The FAA must receive comments on this certificate of airworthiness, whichever date is for this AD, if requested using the procedures airworthiness directive (AD) by September earlier: Within 12 months after the effective found in 14 CFR 39.19. In accordance with 13, 2021. date of this AD. 14 CFR 39.19, send your request to your (b) Affected ADs (i) Service Information Exception principal inspector or local Flight Standards None. District Office, as appropriate. If sending Where Bombardier Learjet 40 Service information directly to the manager of the (c) Applicability Bulletin 40–57–06, Revision 1, dated October certification office, send it to the attention of This AD applies to Learjet Inc. Model 45 26, 2020, Bombardier Learjet 45 Service the person identified in Related Information. (Learjet 40), Model 45 (Learjet 45), Model 45 Bulletin 45–57–13, Revision 1, dated October (2) Before using any approved AMOC, (Learjet 70), and Model 45 (Learjet 75) 26, 2020, Bombardier Learjet 70 Service notify your appropriate principal inspector, airplanes, serial numbers 45–002 through 45– Bulletin 70–57–02, Revision 1, dated October or lacking a principal inspector, the manager 596 and 45–2001 through 45–2146, 26, 2020, and Bombardier Learjet 75 Service of the local flight standards district office/ certificated in any category. Bulletin 75–57–01, Revision 2, dated April certificate holding district office. 19, 2021, specify contacting Learjet Inc. for (3) An AMOC that provides an acceptable (d) Subject appropriate action: Before further flight, level of safety may be used for any repair, Joint Aircraft System Component (JASC) repair using a method approved in modification, or alteration required by this Code 5714, Wing, Center Box. accordance with the procedures specified in AD if it is approved by a Learjet Inc. (e) Unsafe Condition paragraph (l) of this AD. Designated Engineering Representative, or a Unit Member of the Learjet Organization This AD was prompted by reports of (j) Reporting Requirement Designation Authorization, that has been corrosion found on the upper surface of the Within 30 days after completing the initial authorized by the Manager, Wichita ACO lower center wing mid spar splice plate. The inspection required by paragraph (h) of this Branch, to make those findings. To be FAA is issuing this AD to detect and correct AD or within 30 days after the effective date approved, the repair, modification, or corrosion or deterioration of protective of this AD, whichever occurs later, submit a alteration method must meet the certification treatments on the center wing area. The report of the findings (both positive and basis of the airplane, and the approval must unsafe condition, if not addressed, could negative) of the inspection to: Wichita-COS@ specifically refer to this AD. result in failure of the wing centerline joint faa.gov; or Ann Johnson, Wichita ACO and lead to partial wing separation with (m) Related Information consequent loss of control of the airplane. Branch, 1801 Airport Road, Wichita, KS 67209. This reporting requirement is limited (1) For more information about this AD, (f) Compliance to the initial inspection results only. The contact Tara Shawn, Aviation Safety Engineer, Wichita ACO Branch, FAA, 1801 Comply with this AD within the report must include: The name of the owner; Airport Road, Wichita, KS 67209; phone: compliance times specified, unless already the address of the owner; the name of the done. organization doing the actions required by (316) 946–4141; fax: (316) 946–4107; email: this AD; the date the inspection was [email protected]. (g) Applicable Service Bulletins completed; the name of the person (2) For service information identified in Use the following service bulletins, as submitting the report; the address, telephone this AD, contact Learjet Inc., One Learjet applicable to your airplane model number, and email of the person submitting Way, Wichita, KS 67209; phone: (316) 946– configuration, to perform the actions required the report; the airplane serial number; the 2000; email: [email protected]; by paragraph (h) of this AD: date of issuance of the original airworthiness website: businessaircraft.bombardier.com/ (1) Bombardier Learjet 40 Service Bulletin certificate, or the date of issuance of the en/aircraft/Learjet.html. You may view this 40–57–06, Revision 1, dated October 26, original export certificate of airworthiness referenced service information at the FAA, 2020; (whichever date is earlier); whether Airworthiness Products Section, Operational (2) Bombardier Learjet 45 Service Bulletin protective treatments are deteriorated, and if Safety Branch, 901 Locust, Kansas City, MO 45–57–13, Revision 1, dated October 26, so, the location of deteriorated areas; whether 64106. For information on the availability of 2020; corrosion was detected, and if so, the this material at the FAA, call (816) 329–4148. (3) Bombardier Learjet 70 Service Bulletin location of corrosion; and a list of parts Issued on July 21, 2021. 70–57–02, Revision 1, dated October 26, replaced if the level of corrosion required Gaetano A. Sciortino, 2020; and replacement of parts. (4) Bombardier Learjet 75 Service Bulletin Deputy Director for Strategic Initiatives, 75–57–01, Revision 2, dated April 19, 2021. (k) Credit for Previous Actions Compliance & Airworthiness Division, Aircraft Certification Service. (h) Wing Center Spar Inspection, Related You may take credit for the initial wing Investigative Inspections, and Corrective spar inspection required by the introductory [FR Doc. 2021–15953 Filed 7–27–21; 8:45 am] Actions text to paragraph (h) of this AD if you BILLING CODE 4910–13–P At the applicable initial compliance time performed the visual inspection before the specified in paragraph (h)(1) or (2) of this AD effective date of this AD using Bombardier and thereafter at intervals not to exceed 8 Learjet 40 Service Bulletin 40–57–06, Basic DEPARTMENT OF TRANSPORTATION years, inspect the center wing area for Issue, dated February 25, 2019; Bombardier corrosion and deterioration of protective Learjet 45 Service Bulletin 45–57–13, Basic Federal Aviation Administration treatments and perform all related corrective Issue, dated February 25, 2019; Bombardier actions by following the Accomplishment Learjet 70 Service Bulletin 70–57–02, Basic 14 CFR Part 39 Instructions, steps 3.A. and 3.B., of the Issue, dated February 25, 2019; Bombardier applicable service bulletin listed in Learjet 75 Service Bulletin 75–57–01, Basic [Docket No. FAA–2021–0604; Project paragraph (g) of this AD. Issue, dated February 25, 2019; or Identifier 2019–CE–007–AD] (1) For airplanes with 8 or fewer years Bombardier Learjet 75 Service Bulletin 75– since the date of issuance of the original 57–01, Revision 1, dated October 26, 2020. RIN 2120–AA64 airworthiness certificate or the date of (1) To take credit for the initial inspection, issuance of the original export certificate of you must comply with paragraph (j) of this Airworthiness Directives; Pacific airworthiness, whichever date is earlier: AD within 30 days after the effective date of Aerospace Limited Airplanes Before or upon accumulating 8 years or this AD. within 12 months after the effective date of (2) You cannot take credit for the recurring AGENCY: Federal Aviation this AD, whichever occurs later; or inspections, only the initial inspection. Administration (FAA), DOT.

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