Background The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all BAE Systems (Operations) Limited Model 4101 airplanes. The NPRM published in the Federal Register on April 14, 2023 (88 FR 22920). The NPRM was prompted by AD G-2022-0019, dated October 31, 2022, issued by The Civil Aviation Authority (CAA), which is the aviation authority for the United Kingdom (U.K.) (referred to after this as the MCAI). The MCAI states that in-service cracking occurred on the Jetstream 41 passenger door edge member, seal carrier, and inner skin, adjacent to the roller guide bracket. BAE Systems (Operations) Limited reviewed the fatigue test data and existing inspection requirements, and concluded a new inspection is needed to address this potential unsafe condition. In the NPRM, the FAA proposed to require a one-time inspection of the external visible surface of the inner skin, door edge member, and seal carrier adjacent to the roller bracket attachment brackets; and the inner skin, door edge member, and seal carrier at the roller bracket attachment bore, and repair if necessary. The FAA is issuing this AD to address undetected cracking of the passenger door. The unsafe condition, if not addressed, could result in a partial failure of the passenger door, and consequent reduced structural integrity of the passenger door. You may examine the MCAI in the AD docket at regulations.gov under Docket No. FAA-2023-0929. Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the cost to the public. Conclusion This product has been approved by the aviation authority of another country and is approved for operation in the United States. Pursuant to the FAA's bilateral agreement with this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI referenced above. The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on this product. Except for minor editorial changes, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator. Related Service Information Under 1 CFR Part 51 The FAA reviewed BAe JETSTREAM Series 4100 Service Bulletin J41-52-065, Revision 1, dated June 8, 2022. This service information specifies procedures for a one-time eddy current inspection of the external visible surface of the inner skin, door edge member, and seal carrier adjacent to the roller bracket attachment brackets for cracking; a one-time eddy current inspection of the inner skin, door edge member, and seal carrier at the roller bracket attachment bores for cracking; and repair. This service information 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. Costs of Compliance The FAA estimates that this AD affects 12 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: Estimated Costs for Required Actions Labor cost Parts cost Cost per product Cost on U.S. operators 2 work-hours × $85 per hour = Up to $170 $0 $170 $2,040 The FAA has received no definitive data on which to base the cost estimates for the on-condition actions specified in this AD. Authority for This Rulemaking Title 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. The 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 FAA with 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. Regulatory Findings 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 power and responsibilities among the various levels of government. For the reasons discussed above, I certify that this AD: (1) Is not a "significant regulatory action" under Executive Order 12866, (2) Will not affect intrastate aviation in Alaska, and (3) 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 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. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2023-12-22 BAE Systems (Operations) Limited: Amendment 39-22481; Docket No. FAA-2023-0929; Project Identifier MCAI-2022-01401-T. (a) Effective Date This airworthiness directive (AD) is effective August 23, 2023. (b) Affected ADs None. (c) Applicability This AD applies to all BAE Systems (Operations) Limited Model 4101 airplanes, certificated in any category. (d) Subject Air Transport Association (ATA) of America Code 52, Doors. (e) Unsafe Condition This AD was prompted by in-service cracking of the passenger door edge member, seal carrier, and inner skin, adjacent to the roller guide bracket. The FAA is issuing this AD to address undetected cracking of the passenger door. The unsafe condition, if not addressed, could result in a partial failure of the passenger door, and consequent reduced structural integrity of the passenger door. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Inspections At the applicable time specified in paragraph (g)(1) or (2) of this AD, accomplish an eddy current inspection of the external visible surface of the inner skin, door edge member, and seal carrier adjacent to the roller bracket attachment brackets for cracking; and an eddy current inspection of the inner skin, door edge member, and seal carrier at the roller bracket attachment bores for cracking, in accordance with paragraph 2.B. of the Accomplishment Instructions of BAe JETSTREAM Series 4100 Service Bulletin J41-52-065, Revision 1, dated June 8, 2022. (1) For airplanes that have accumulated 18,000 total flight cycles or fewer as of the effective date of this AD: Accomplish the inspections prior to the accumulation of 20,000 total flight cycles. (2) For airplanes that have accumulated more than 18,000 total flight cycles as of the effective date of this AD: Accomplish the inspections within 2,000 flight cycles after the effective date of this AD. (h) Corrective Actions If, during any inspection required by paragraph (g) of this AD, any crack is detected: Before further flight, repair using a method approved by the Manager, International Validation Branch, FAA; or the United Kingdom Civil Aviation Authority (U.K. CAA); or BAE Systems (Operations) Limited's U.K. CAA's (DOA). If approved by the DOA, the approval must include the DOA-authorized signature. (i) No Reporting Requirement Although BAe JETSTREAM Series 4100 Service Bulletin J41-52-065, Revision 1, dated June 8, 2022, specifies to submit certain information to the manufacturer, this AD does not include that requirement. (j) Additional AD Provisions The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager, International Validation Branch, mail it to the address identified in paragraph (k)(2) of this AD or email to: 9-AVS-AIR-730-AMOC@faa.gov. If mailing information, also submit information by email. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (2) Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, International Validation Branch, FAA; or the U.K. CAA; or BAE Systems (Operations) Limited's U.K. CAA's Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature. (k) Additional Information (1) Refer to U.K. CAA G-2022-0019, dated October 31, 2022, for related information. This U.K. CAA AD may be found in the AD docket at regulations.gov under Docket No. FAA-2023-0929. (2) For more information about this AD, contact Todd Thompson, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 206-231-3228; email todd.thompson@faa.gov. (l) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless this AD specifies otherwise. (i) BAe JETSTREAM Series 4100 Service Bulletin J41-52-065, Revision 1, dated June 8, 2022. (ii) [Reserved] (3) For service information identified in this AD, contact BAE Systems (Operations) Limited, Customer Information Department, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland, United Kingdom; telephone +44 1292 675207; fax +44 1292 675704; email RApublications@baesystems.com; website regional-services.com . (4) You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. (5) You may view this service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email fr.inspection@nara.gov, or go to: www.archives.gov/federal-register/cfr/ibr-locations.html. Issued on July 13, 2023. Victor Wicklund, Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service.