Background \n\n\n\tThe FAA issued AD 2021-11-03, Amendment 39-21565 (86 FR 30759, June 10, 2021) (AD 2021-11-03), for certain Airbus Helicopters Model EC 155B, EC155B1, SA-365N, SA-365N1, AS-365N2, and AS 365 N3 helicopters. AD 2021-11-03 required inspecting and if necessary, replacing the MGB front fitting. AD 2021-11-03 also required modifying the MGB front fitting. AD 2021-11-03 was prompted by EASA AD 2019-0008, dated January 22, 2019 (EASA AD 2019-0008), issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for certain Airbus Helicopters (AH), formerly Eurocopter, Eurocopter France, Aerospatiale, Model EC 155 B, EC 155 B1, SA 365 N, SA 365 N1, AS 365 N2, and AS 365 N3 helicopters. EASA advises of reports of an in-flight loss of engine and MGB cowlings. Subsequent investigations revealed that the MGB cowling attachment fittings failed because of mounting stress in the MGB front fittingand air intake bulkhead. This condition, if not addressed, could result in damage to the helicopter, loss of helicopter control, and possible injury to persons on the ground. \n\tAccordingly, EASA AD 2019-0008 requires inspecting the MGB front fittings and if there is a discrepancy, the EASA AD requires applicable corrective action(s) before next flight. EASA AD 2019-0008 also requires modification of the MGB fixed cowling attachments. Accomplishing the modification constitutes a terminating action for the required inspection. \n\nActions Since AD 2021-11-03 Was Issued \n\n\n\tSince AD 2021-11-03 was issued, the FAA discovered that paragraph ''(h) Exceptions to EASA AD 2019-0008'' of AD 2021-11-03, inadvertently omitted service information required for Airbus Helicopters Model EC 155B and EC155B1 helicopters. This AD corrects subparagraph (h)(8) to add Airbus Helicopters Alert Service Bulletin ASB No. 53A035, Revision 0, dated March 13, 2017, and ASB No. 53A035, Revision 1, dated December 20, 2018. This AD also updates the U.S. fleet size in the Costs of Compliance section. \n\nFAA's Determination \n\n\n\tThese products have been approved by the aviation authority of another country, and are approved for operation in the United States. Pursuant to the bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the EASA AD referenced above. The FAA is issuing this AD after evaluating all the relevant information and determining the unsafe condition described previously is likely to exist or develop in other products of these same type designs. \n\nRelated IBR Material Under 1 CFR Part 51 \n\n\n\tThis AD requires EASA AD 2019-0008, dated January 22, 2019, which the Director of the Federal Register approved for incorporation by reference as of July 15, 2021 (86 FR 30759, June 10, 2021). EASA AD 2019-0008 requires inspecting the MGB front fittings within 110 flight hours after April 14, 2017 (the effective date of EASA AD 2017-0055, dated March 31, 2017). If there is a discrepancy, the EASA AD requires applicable corrective action(s) before next flight. EASA AD 2019-0008 also requires modification of the MGB fixed cowling attachments within 660 flight hours or 23 months, whichever occurs first, after the effective date described in EASA AD 2019-0008. Accomplishing the modification constitutes a terminating action for the required inspection. \n\tThis AD also requires Airbus Helicopters Alert Service Bulletin ASB No. AS365-53.00.62 and ASB No. EC155-53A038, each Revision 0 and dated December 20, 2018 (ASB AS365-53.00.62 and ASB EC155-53A038). ASB AS365- 53.00.62 applies to Model AS365-series helicopters. ASB EC155-53A038 applies to Model EC155-series helicopters. The Director of the Federal Register also approved this service information for incorporation by reference as of July 15, 2021 (86 FR 30759, June 10, 2021). This service information specifies replacing the front bracket, inspecting for stress of the MGB fixed cowlings on the radiator bulkhead, and installing an additional locking system. \n\tThis material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section. \n\nAD Requirements \n\n\n\tThis AD requires accomplishing the actions specified in EASA AD 2019-0008 and the service information already described, except for any differences identified as exceptions in the regulatory text of this AD. \n\n((Page 47559)) \n\nJustification for Immediate Adoption and Determination of the Effective Date \n\n\n\tSection 553(b)(3)(B) of the Administrative Procedure Act (APA) (5 U.S.C. 551 et seq.) authorizes agencies to dispense with notice and comment procedures for rules when the agency, for ''good cause,'' finds that those procedures are ''impracticable, unnecessary, or contrary to the public interest.'' Under this section, an agency, upon finding good cause, may issue a finalrule without providing notice and seeking comment prior to issuance. Further, section 553(d) of the APA authorizes agencies to make rules effective in less than thirty days, upon a finding of good cause. \n\tAD 2021-11-03 omitted service information required for compliance for certain Model EC 155B and EC155B1 helicopters. This AD corrects that error by including Airbus Helicopters Alert Service Bulletin ASB No. 53A035, Revision 0, dated March 13, 2017, and ASB No. 53A035, Revision 1, dated December 20, 2018 in the regulatory text. The public was previously provided opportunity for comment on the costs of the AD and required actions. \n\tAccordingly, notice and opportunity for prior public comment are unnecessary pursuant to 5 U.S.C. 553(b)(3)(B). In addition, the FAA finds that good cause exists pursuant to 5 U.S.C. 553(d) for making this amendment effective in less than 30 days, for the same reasons the FAA found good cause to forego notice and comment. \n\nExplanation of Required Compliance Information \n\n\n\tIn the FAA's ongoing efforts to improve the efficiency of the AD process, the FAA developed a process to use some civil aviation authority (CAA) ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has been coordinating this process with manufacturers and CAAs. As a result, the FAA is incorporating EASA AD 2019-0008 by reference in this FAA final rule. This AD, therefore, requires compliance with EASA AD 2019-0008 in its entirety through that incorporation, except for any differences identified as exceptions in the regulatory text of this AD. Using common terms that are the same as the heading of a particular section in EASA AD 2019-0008 does not mean that operators need comply only with that section. For example, where the AD requirement refers to ''all required actions and compliance times,'' compliance with this AD requirement is not limited to the section titled ''Required Action(s) and Compliance Time(s)'' in EASA AD 2019-0008. Service information required by EASA AD 2019-0008 for compliance is available at https://www.regulations.gov by searching for and locating Docket No. FAA-2021- 0717. \n\nComments Invited \n\n\n\tThe FAA invites you to send any written relevant data, views, or arguments about this AD. Send your comments to an address listed under ADDRESSES. Include ''Docket No. FAA-2021-0717; Project Identifier AD- 2021-00814-R'' at the beginning of your comments. The most helpful comments reference a specific portion of the AD, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this AD because of those comments. \n\tExcept for Confidential Business Information (CBI) as described in the following paragraph, and other information as described in 14 CFR 11.35, the FAA will post all comments received, without change, to https://www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this AD. \n\nConfidential Business Information \n\n\n\tCBI is commercial or financial information that is both customarily and actually treated as private by its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public disclosure. If your comments responsive to this AD contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this AD, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI as ''PROPIN.'' The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this AD. Submissions containing CBI should be sent to Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 1600 Stewart Ave., Suite 410, Westbury, NY 11590; telephone (516) 228- 7330; email andrea.jimenez@faa.gov. Any commentary that the FAA receives that is not specifically designated as CBI will be placed in the public docket for this rulemaking. \n\nRegulatory Flexibility Act (RFA) \n\n\n\tThe requirements of the RFA do not apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and comment. Because the FAA has determined that it has good cause to adopt this rule without notice and comment, RFA analysis is not required. \n\nCosts of Compliance \n\n\n\tThe FAA estimates that this AD affects 53 helicopters of U.S. Registry. Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates that operators may incur the following costs in order to comply with this AD. \n\tInspecting the MGB front fittings takes about 2 work-hours for an estimated cost of $170 per helicopter and $9,010 for the U.S. fleet. If required, replacing an MGB front fitting takes about 2 work-hours and parts cost about $590 for an estimated total cost of $760 per fitting. Other repairs will take up to 8 work-hours (excluding drying time) and parts will cost a minimal amount for an estimated cost of up to $680 per helicopter. \n\tModifying the MGB fixed cowling attachments takes about 5 work- hours and parts cost about $630 for an estimated cost of $1,055 per helicopter and $55,915 for the U.S. fleet. \n\nAuthority for This Rulemaking \n\n\n\tTitle 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation Programs, describes in more detail the scope of the Agency's authority. \n\tThe FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAAwith promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. \n\nRegulatory Findings \n\n\n\tThe FAA determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of \n\n((Page 47560)) \n\npower and responsibilities among the various levels of government. \n\tFor the reasons discussed above, I certify this regulation: \n\t(1) Is not a ''significant regulatory action'' under Executive Order 12866, and \n\t(2) Will not affect intrastate aviation in Alaska. \n\nList of Subjects in 14 CFR Part 39 \n\n\n\tAir transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.