Airworthiness Directives; BAE Systems (Operations) Limited Airplanes, 13561-13571 [2025-04983]

Download as PDF Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2025–0339; Project Identifier MCAI–2024–00450–T] RIN 2120–AA64 Airworthiness Directives; BAE Systems (Operations) Limited Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to supersede Airworthiness Directive (AD) 2023–02–06, which applies to all BAE Systems (Operations) Limited Model 4101 airplanes. AD 2023–02–06 requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. Since the FAA issued AD 2023–02–06, the FAA has determined that new or more restrictive airworthiness limitations are necessary. This proposed AD would continue to require certain actions in AD 2023–02–06 and require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is proposing this AD to address the unsafe condition on these products. DATES: The FAA must receive comments on this NPRM by May 9, 2025. ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: • Federal eRulemaking Portal: Go to regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590. • Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA–2025–0339; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the mandatory continuing airworthiness information (MCAI), any comments received, and other information. The street address for Docket Operations is listed above. ddrumheller on DSK120RN23PROD with PROPOSALS1 SUMMARY: VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 Material Incorporated by Reference: • For material identified in this proposed 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 baesystems.com/en/our-company/ourbusinesses/regional-aircraft/about-us. • You may view this material 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. FOR FURTHER INFORMATION CONTACT: Todd Thompson, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 206–231–3228; email todd.thompson@faa.gov. SUPPLEMENTARY INFORMATION: Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2025–0339; Project Identifier MCAI–2024–00450–T’’ at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, 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 the proposal because of those comments. Except 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 regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM. Confidential Business Information CBI 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 NPRM 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 NPRM, it is important that you clearly designate the submitted PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 13561 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 NPRM. Submissions containing CBI should be sent to Todd Thompson, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 206–231–3228; email todd.thompson@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. Background The FAA issued AD 2023–02–06, Amendment 39–22313 (88 FR 7851, February 7, 2023) (AD 2023–02–06), for all BAE Systems (Operations) Limited Model 4101 airplanes. AD 2023–02–06 was prompted by an MCAI originated by the Civil Aviation Authority (CAA), which is the aviation authority for the United Kingdom (UK) (UK CAA). The UK CAA issued AD G–2022–0006, dated March 30, 2022 (UK CAA AD G–2022– 0006), to correct an unsafe condition. AD 2023–02–06 requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA issued AD 2023– 02–06 to address fatigue damage of various airplane structures and failure of certain structurally significant items, which could result in reduced structural integrity of the airplane. The FAA also issued AD 2023–02–06 to address fuel vapor ignition sources, which could result in a fuel tank explosion and consequent loss of the airplane. Actions Since AD 2023–02–06 Was Issued Since the FAA issued AD 2023–02– 06, the UK CAA superseded AD G– 2022–0006, and issued UK CAA AD G– 2024–0003, dated August 6, 2024; corrected August 14, 2024 (UK CAA AD G–2024–0003) (also referred to as the MCAI), to correct an unsafe condition on all BAE Systems (Operations) Limited Model 4101 airplanes. The MCAI states new or more restrictive airworthiness limitations have been developed. The FAA is proposing this AD to address the unsafe condition on these products. You may examine the MCAI in the AD docket at regulations.gov under Docket No. FAA–2025–0339. E:\FR\FM\25MRP1.SGM 25MRP1 13562 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules Material Incorporated by Reference Under 1 CFR Part 51 The FAA reviewed Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 Aircraft Maintenance Manual (AMM), Revision 46, dated February 20, 2024. This service information specifies airworthiness limitations for life-limited parts and structurally significant items. This proposed AD would also require Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 Aircraft Maintenance Manual (AMM), Effectivity Group 403, Revision 44, dated June 15, 2021; and Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, dated June 15, 2021; which the Director of the Federal Register approved for incorporation by reference as of March 14, 2023 (88 FR 7851, February 7, 2023). ‘‘Effectivity Group’’ is not specifically stated on these documents. However, ‘‘403’’ and ‘‘408,’’ which are stated on the pages of the applicable documents (except for the title pages), refer to the effective groups of airplanes specified within the fleet code listings. This 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. Other Related Material The FAA also reviewed Subject 05– 10–20, ‘‘Certification Maintenance Requirements,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ and Subject 05–10–30, ‘‘Critical Design Configuration Control Limitations (CDCCL)—Fuel System,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 Aircraft Maintenance Manual (AMM), Revision 45, dated December 15, 2023. This service information specifies airworthiness limitations for certification maintenance requirements and fuel tank systems, which are specified in appendices A and B of this proposed AD. ddrumheller on DSK120RN23PROD with PROPOSALS1 FAA’s Determination 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 and material referenced above. The FAA is issuing this NPRM after determining that the unsafe VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 condition described previously is likely to exist or develop on other products of the same type design. Proposed Requirements of This NPRM This proposed AD would retain certain requirements of AD 2023–02–06. This proposed AD would also require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. This proposed AD would require revisions to certain operator maintenance documents to include new actions (e.g., inspections) and Critical Design Configuration Control Limitations (CDCCLs). Compliance with these actions and CDCCLs is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by this proposed AD, the operator may not be able to accomplish the actions described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (k)(1) of this proposed AD. Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 4 airplanes of U.S. registry. The FAA estimates the following costs to comply with this proposed AD: The FAA estimates the total cost per operator for the retained actions from AD 2023–02–06 to be $7,650 (90 workhours × $85 per work-hour). The FAA has determined that revising the maintenance or inspection program takes an average of 90 work-hours per operator, although the agency recognizes that this number may vary from operator to operator. Since operators incorporate maintenance or inspection program changes for their affected fleet(s), the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate. Therefore, the agency estimates the average total cost per operator to be $7,650 (90 work-hours × $85 per work-hour). The FAA estimates the total cost per operator for the new proposed actions to be $7,650 (90 work-hours × $85 per work-hour). 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 PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 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 The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Would not affect intrastate aviation in Alaska, and (3) Would 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 Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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: a. Removing Airworthiness Directive (AD) 2023–02–06, Amendment 39– 22313 (88 FR 7851, February 7, 2023); and ■ b. Adding the following new AD: ■ ■ BAE Systems (Operations) Limited: Docket No. FAA–2025–0339; Project Identifier MCAI–2024–00450–T. E:\FR\FM\25MRP1.SGM 25MRP1 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules (a) Comments Due Date The FAA must receive comments on this airworthiness directive (AD) by May 9, 2025. (b) Affected ADs This AD replaces AD 2023–02–06, Amendment 39–22313 (88 FR 7851, February 7, 2023) (AD 2023–02–06). (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 05, Time Limits/Maintenance Checks. (e) Unsafe Condition This AD was prompted by a determination that new or more restrictive airworthiness limitations are necessary. The FAA is issuing this AD to address fatigue damage of various airplane structures and failure of certain structurally significant items, which could result in reduced structural integrity of the airplane. The FAA is also issuing this AD to address fuel vapor ignition sources, which could result in a fuel tank explosion and consequent loss of the airplane. ddrumheller on DSK120RN23PROD with PROPOSALS1 (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Retained Revision of the Existing Maintenance or Inspection Program, With a Terminating Action This paragraph restates the requirements of paragraph (m) of AD 2023–02–06, with a new terminating action. Within 90 days after March 14, 2023 (the effective date of AD 2023–02–06): Revise the existing maintenance or inspection program, as applicable, by incorporating Subjects 05–10– 10, ‘‘Airworthiness Limitations’’; 05–10–20, ‘‘Certification Maintenance Requirements’’; and 05–10–30, ‘‘Critical Design Configuration Control Limitations (CDCCL)—Fuel System’’; of Chapter 05, ‘‘Airworthiness Limitations,’’ of the BAE Systems (Operations) Limited J41 Aircraft Maintenance Manual (AMM), Effectivity Group 403, Revision 44, dated June 15, 2021; or BAE Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, dated June 15, 2021; as applicable. The initial compliance times for the tasks are at the applicable times specified in paragraphs (g)(1) through (3) of this AD. Accomplishing the revision of the existing maintenance or inspection program required by paragraph (i) of this AD terminates the requirements of this paragraph. (1) For replacement tasks of life limited parts specified in Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of the BAE Systems (Operations) Limited J41 AMM, Effectivity Group 403, Revision 44, dated June 15, 2021; or BAE Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, dated June 15, 2021; as applicable: Prior to the applicable flight cycles (landings) or flight hours (flying hours) on the part specified in the VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 ‘‘Mandatory Life Limits’’ column in Subject 05–10–10, or within 90 days after March 14, 2023, whichever occurs later. (2) For structurally significant item tasks specified in Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of the BAE Systems (Operations) Limited J41 AMM, Effectivity Group 403, Revision 44, dated June 15, 2021; or BAE Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, dated June 15, 2021; as applicable: Prior to the accumulation of the applicable flight cycles specified in the ‘‘Initial Inspection’’ column in Subject 05– 10–10, or within 90 days after March 14, 2023, whichever occurs later. (3) For certification maintenance requirements tasks specified in Subject 05– 10–20, ‘‘Certification Maintenance Requirements,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of the BAE Systems (Operations) Limited J41 AMM, Effectivity Group 403, Revision 44, dated June 15, 2021; or BAE Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, dated June 15, 2021; as applicable: Prior to the accumulation of the applicable flight hours specified in the ‘‘Time Between Checks’’ column in Subject 05–10– 20, or within 90 days after March 14, 2023, whichever occurs later; except for tasks that specify ‘‘first flight of the day’’ in the ‘‘Time Between Checks’’ column in Subject 05–10– 20, the initial compliance time is the first flight of the next day after accomplishing the revision required by paragraph (g) of this AD, or within 90 days after March 14, 2023, whichever occurs later. (h) Retained No Alternative Actions, Intervals, or CDCCLs, With New Exception This paragraph restates the requirements of paragraph (n) of AD 2023–02–06, with new exception. Except as required by paragraph (i) of this AD: After the existing maintenance or inspection program has been revised as required by paragraph (g) of this AD, no alternative actions (e.g., inspections), intervals, or CDCCLs may be used unless the actions, intervals, and CDCCLs are approved as an AMOC in accordance with the procedures specified in paragraph (k)(1) of this AD. (i) New Revision of the Existing Maintenance or Inspection Program Within 90 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, as specified in paragraphs (i)(1) and (2) of this AD. Accomplishing the revision of the existing maintenance or inspection program required by this paragraph terminates the actions required by paragraph (g) of this AD. (1) Revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 AMM, Revision 46, dated February 20, 2024. The initial compliance time for doing the tasks is at the applicable times specified in paragraphs (i)(1)(i) and (ii) of this AD. PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 13563 (i) For replacement tasks of life limited parts specified in Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 AMM, Revision 46, dated February 20, 2024: Prior to the applicable flight cycles (landings) or flight hours (flying hours) on the part specified in the ‘‘Mandatory Life Limits’’ column in Subject 05–10–10, or within 90 days after the effective date of this AD, whichever occurs later. (ii) For structurally significant item tasks specified in Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 AMM, Revision 46, dated February 20, 2024: Prior to the accumulation of the applicable flight cycles (flights) or years specified in the ‘‘Initial Inspection’’ column in Subject 05– 10–10, or within 90 days after the effective date of this AD, whichever occurs later. (2) Revise the existing maintenance or inspection program, as applicable, to incorporate the information in appendix A to this AD—Subject 05–10–20, ‘‘Certification Maintenance Requirements,’’ and in appendix B to this AD—Subject 05–10–30, ‘‘Critical Design Configuration Control Limitations (CDCCL)—Fuel System.’’ The initial compliance time for doing the certification maintenance requirements tasks specified in Subject 05–10–20, ‘‘Certification Maintenance Requirements’’ (appendix A) is prior to the accumulation of the applicable flight hours specified in the ‘‘Time Between Checks’’ column in Subject 05–10–20, or within 90 days after the effective date of this AD, whichever occurs later; except for tasks that specify ‘‘first flight of the day’’ in the ‘‘Time Between Checks’’ column in Subject 05–10–20, the initial compliance time is the first flight of the next day after accomplishing the revision required by paragraph (i) of this AD, or within 90 days after the effective date of this AD, whichever occurs later. (j) New No Alternative Actions, Intervals, or CDCCLs After the existing maintenance or inspection program has been revised as required by paragraph (i) of this AD, no alternative actions (e.g., inspections), intervals, or CDCCLs may be used unless the actions, intervals, and CDCCLs are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (k)(1) of this AD. (k) 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 of the International Validation Branch, send it to the attention of the person identified in paragraph (l) of this AD and email to: AMOC@faa.gov. Before using any E:\FR\FM\25MRP1.SGM 25MRP1 13564 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules 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 UK CAA; or BAE Systems (Operations) Limited’s UK CAA Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature. (l) Additional Information 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. (m) Material Incorporated by Reference ddrumheller on DSK120RN23PROD with PROPOSALS1 (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless this AD specifies otherwise. VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 (3) The following material was approved for IBR on [DATE 35 DAYS AFTER PUBLICATION OF THE FINAL RULE]. (i) Subject 05–10–10, ‘‘Airworthiness Limitations,’’ of Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 Aircraft Maintenance Manual (AMM), Revision 46, dated February 20, 2024. (ii) [Reserved] (4) The following material was approved for IBR on March 14, 2023 (88 FR 7851, February 7, 2023). (i) Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 AMM, Effectivity Group 403, Revision 44, dated June 15, 2021. Note 1 to paragraph (m)(4)(i): This note applies to paragraphs (m)(4)(i) and (ii) of this AD. Page 1 of the ‘‘Publications Transmittal’’ is the only page that shows the revision level of this document. Note 2 to paragraph (m)(4)(i): This note applies to paragraphs (m)(4)(i) and (ii) of this AD. ‘‘Effectivity Group’’ is not specifically stated on the document. However, ‘‘403’’ and ‘‘408,’’ which are stated on the pages of the applicable documents (except for the title pages), refer to the effective groups of airplanes specified within the fleet code listings. PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 (ii) Chapter 05, ‘‘Airworthiness Limitations,’’ of BAE Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, dated June 15, 2021. (5) For material 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 baesystems.com/en/our-company/ourbusinesses/regional-aircraft/about-us. (6) You may view this material 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. (7) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ ibr-locations or email fr.inspection@nara.gov. Appendix A to BAE Systems (Operations) Limited: Docket No. FAA–2025–0339; Project Identifier MCAI–2024–00450–T—Subject 05– 10–20, ‘‘Certification Maintenance Requirements’’ BILLING CODE 4910–13–P E:\FR\FM\25MRP1.SGM 25MRP1 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules 13565 CE!Hlf I CATION Ml\!NH.NANCE IU,QU!!U:MfNT,], t!ESCR I i'f l ON ANO OPERAJlQJi This Se,:; t ion is JAA/U,A Approved. ! t give!> the check procedures. and the maximum permitted time between che,:;ks. m:icessaq,· to maintain the certi icated airwon:hines,;. !>tandard of the airplane as determii,ed in ai::conlance with the requirements of ,JAR/fAR 25.!309, These items are identified a,;. Certi ication Maintenan,:;e Requirements (Ci'\R;;}. The 1'ab es in paragraph 2 of this Section li:a the Cf'.Rs, the maximum permitted time interva between each ,:;he.ck in number of f 1 i ght !lours and the associated c!"H:?<:k pro,:;edure (AMI'. lASK RHi. The Alrp!.'me. Maintenance Progi·am mu,s,t l nclude a isted Cl'.Rs at interva s not exceeding the isted time5, The maidm1.1,'11 permitted time between CMR ,:;hecki m.i't not be ln<:reaied wl thout consul tatlon with the ai rp!ane m,H'MJfacturer and i;pedf le approw1 from the responsib e JAA/f.4.A Aircraft Certification Off ice. lhe CMR Tab es contaifl some items that have a f IRST f!. !GIH Of Hit OAY cMck time. lhese items are a so shown in the Norma! Pn:>ce<lures Chapter of the Airplane li l'\anual. These itemi must be inc uded in the Operator's f ight Crew list. lhey may not be removed without consu tation with the airplane manufact1..wer and sped f ic approva rom the responii b e JAA/fAA Aircraft Certification Of l,:;e. The CMR 'lab es are in !HA chapter sequen,:;e. Each C:MR is identified as a five digit sequence m.;mber, fol' examp e 2\-01:H. The in:;t two n1;."'!lber·s identi the J.\IA section and the ast Uu-ee nl.llnber·s are the C1'R sequential numb<l!r that AlA section. A, Chapter 2: - Air Conditioning Table IH1' OESCR!Pll ON Tl l'\E BEn./HN CHECKS (HT HRS) CHECK PROCEOURES (AM H\SK RE I') Pr·essurizatlon Sy'Stem 600 2t-30-oo-710-B10 VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 PO 00000 Frm 00008 - Fmt 4702 Sfmt 4725 E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.000</GPH> ddrumheller on DSK120RN23PROD with PROPOSALS1 Manual Control 13566 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules Table continued ... ITU<\ llESCRIPllON T'I ME BETWEEN CHECK PROCEDURES (AM ·rAS.K RU') CHECKS (HT HRS) Prnsur izatlon Sy'lltem Negative Pressure Relief l'lodu I e. - .3900 21-30-00-720-830 func t l ona I Test Zl-003 tnvi nmmental Control System fault: Control Relay11 - functional 'T'e.st 10000 zI-10-so-120-aoI 21-004 Pn1n.ure Regulating and Sh1.rt--Off Valve Control 11olenold •• functional Te!lit 10000· 21-10-15-760-801 Air Condi tionlng Pack Ov•rpressure. Swit<:he,i; l'unctlonal Test 10000 z1-10-2s-120-aos ITEM DESCRIPTION TIME l:IE'l'WUN CHECK PROCEDURES CHECKS (AM TASK RU') (flT HRS) 24-31-00-110-810 llC Generator System Overvolhge Protection Op•erational Test OC Gem11n t,or Control Unit Acceptance Check Removal/lay Check/lnHal lat Ion/ Operatl<:mal Tet.t 16000 £.mer gency 81.111:!a r Supp I. y Oiode!ll and Remote Ct1ntrol Circuit Breaker ■ Opera t l oru1 ! ·res t 1000 (Ref. CM 24-Jl-lO} Jkt 265001 PO 00000 Frm 00009 Fmt 4702 Sfmt 4725 E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.001</GPH> ddrumheller on DSK120RN23PROD with PROPOSALS1 16:37 Mar 24, 2025 24 ·- .32-0 0·· '7 l 0- SOS 24-Jz-ao-110-810 Power Oi1tril:11.1tion Unit Oven:urrent Sen:11or111 Operational Te ■ t VerDate Sep<11>2014 24-.31~10-000-801 2t.-:n-I o-Aioo-aos Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules 13567 Table 2 continued ... CMR HUMBER ITEM DEStRIPTI ON Tl f\f. tHECK PROCEDURES SETWHN CHECKS (AM TASK RH) (HT HRS) BUS H>400 TIE Switch - Ope.rat i:ona I Tett Standby Power Supply Unit Capacity - RemovaV8ay Check/Ins ta I h1Hon/ 3000 24-)4-0$-000-801 24-,31t-os-1too-805 CM 24-30-03 Operational Tu,t Standby Power Suppry Unit Dormancy .. Opentional 3000 Test TIM Bf.NUN CHECKS {HT HRS) f Ire Oetec:tion and Overheat Control Un it Self Test Fae: iHty • Operational Te.st FIRST ITEM OfStRIPTI ON fl IGHT Of THE DAY Tl KE BETWEEN CHECKS (flT HRS) Elevator Disconnect Unit - ddrumheller on DSK120RN23PROD with PROPOSALS1 VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 PO 00000 Frm 00010 Fmt 4702 Sfmt 4725 CHECK PROCHURES {AM TASK REF) 7900 2 7-30-0-0-720-825 75Jlt 2 7- 10-00-720-825 functiQnal Test A11 eron Oi seonnect Unit fun ct i ona 1 Test CHECK PROCEDURES {AM TASK RU) E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.002</GPH> CMR NUPIBER ITEM DESCRIPTION 13568 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules Table~ continued ... Ct\R NUKHR ITU\ DESCRIPTION TIM£ BETWEEN CHECKS (HT HRS) CHECK fROCEDIJIU.S (AM TASK RH) 27-003 Stai I Warning and Protection-left and Right Synem Self 'feSit Operational Test FIRST fl. IGtff Of THE OAY 27-) l-00-7 l0-8o J 21-004 Stal J Warning and Protect ion-Ang I e-of- 300 27-3t-00-710-805 3000 27-3H>0-120-8o5 Attack .tnd Ai re raft-On-Ground Switdiing - Operational Test 21-oos Sta!! Warning and Protection Syttem funct!ona ! Test E. Chapter 31 - Indicating/Recording Systems Tabie; CMR NUMBER ITU\ DESCRIPTION Tl ltE BETWEEN CHECKS {HT HRS) CHECK PROCEDURES (AM TASK REf) 31-001 Take-Off Configuration and Warning Syst• (TOCWS} Arming Circuitry Opeutional Test 50 31-53-00-1:0-805 TOCWS-lnput irigger 1200 31-;3-00-120-su, 600 32·6l·00-720·80t 31-002 Circuitry • functional Test )1-00) landing Gear-Horn Control Relay and Anociated Circuitry - functional Tett (Aircraft on Ground) VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 PO 00000 Frm 00011 Fmt 4702 Sfmt 4725 E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.003</GPH> ddrumheller on DSK120RN23PROD with PROPOSALS1 ~ Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules 13569 f . Ch apter 52 - Doors Table 6 Ct\R NUKBER ITEM D£StRIPTION CHECK PROCEDURES TUIE 8ETWUN CHECKS (AM TASK RU) (HT HRS) 2706 Mai n Entrance Door Speed lock Check .. funct;ional 52-001 TeH Main Entranc~ Door-Pressurization lnhibi t function Operational Test G. Chapter H .. 3000 Eng i ne f ue I and Cont ro I/Chapter Table CKR NUKBER 76 - Eng i ne Con trot 7 ITEM DESCRIPTION TIKE BETWUN CHECK PROCEDURES (AM TASK R£f) CHECKS. (flT HRS) flight Idle Baulk Solenoid Mechanism - Operational Test 300 Ovenpeed fue 1 Governor .. Operational Tut 300 ll·OO•QO-'SOl Garrett On-Wing Manual VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 PO 00000 Frm 00012 Fmt 4702 Sfmt 4725 E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.004</GPH> ddrumheller on DSK120RN23PROD with PROPOSALS1 Source:_Chapter 05, "Airworthiness Limitations," of the BAE Systems (Operations) Limited J41 AMM 13570 Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules Appendix B to BAE Systems (Operations) Limited: Docket No. FAA–2025–0339; Project Identifier MCAI–2024–00450–T—Subject 05– 10–30, ‘‘Critical Design Configuration Control Limitations (CDCCL)—Fuel System’’ ** FOR A I RCRAFT ALIJn'< CRITICAL DESIGN CONFIGURATION CONTROL LIMITATIONS (COCCtJ - FUEL SYSTEM DESCRIPTION ANO OPERATION I. The Critical Design Configuration Control llmi tat ions (COCCLs) section identifies certain design configuration features, which must be maintained for the operational life of the aireraft in order to preclude the development of ignition sources in the fuel tank system. COCCLs are mandatory and eannot, be <:hanged or deleted without the approval of the European Aviation Safety Ageney (EASA) or the National Regulatory Authority offiee that is responsible for the Jeutream 41 Type Certificate. A critical fuel tank ignition so,irce prevention feature may exist Int.he fuel system and its related installation or in systems that, if a failure condition were to develop, could interact with the fuel system in such a way that- an unsafe condition would develop without these I imitations. Str iet adherence to configuration, methods, techniques and practices as prescribed is required to ensure compl lance with the COCCL. Any use of parts, methods., teehniques or practices not contained in the applicable CDCCL requires regulatory authority approval. The purpose of the COCCL is to provide instruct.ions to retain a critical ignition source prevention feature during configuration c.hange that may be caused by modification, repairs or maintenance actions. A. Fuel Quantity Indication System (FQIS) (l) Ciitical ignition souree prevention feature: The fuel quantity indication system (FQIS) probes are current-carrying components, They must be lnstal led with a minimum clearance from aircraft structure. (2) Implications of changing this feature: If the probes are not installed correctly, small air gaps may be created between the conductors and the wing sk Ins. Our i ng fau It conditions, ab.normally high voltages may be applied to the FQIS wiring and probes and electrical sparking (areing) may occur across this smal 1 air gap, (3) Instructions for retaining this feature: The proper installation of an FQIS probe to obtain the correct clearance is a COCCL. This must be earried out in accordance with AMM VerDate Sep<11>2014 16:37 Mar 24, 2025 Jkt 265001 PO 00000 Frm 00013 Fmt 4702 Sfmt 4725 E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.005</GPH> ddrumheller on DSK120RN23PROD with PROPOSALS1 28-41-05, Federal Register / Vol. 90, No. 56 / Tuesday, March 25, 2025 / Proposed Rules 13571 8. Fuel Tank Wiring (1) Critical ignition source prevention feature: The electrical wiring inside the fuel tanks is designed to be continuous between the respective tank wall connectors and the affected components. Splicing of wires inside fuel tanks is not permitted. (2) lmp1 icat Ions of changing this feature: Repair of damaged wiring using splices creates joints in the wiring. Failure of these joints could lead to electrical sparking (arcing) inside the fuel tank. Damaged tank wiring should be corrected by complete replacement of the affected wire. (3) Instructions for retaining this feature: Wiring inside fuel tanks must remain continuous between the tank wail connectors and the LRUs. with no extra joints permitted. This feature is a COCCL. Wire replacement inside fuel tanks should be carried out in accordance with AM Ch 20. C. Fuel Boost Pump Wiring (1) Critical ignition source prevention feature: The boost pump power wiring inside the fuel tank is designed to be continuous between the tank wall connectors and the boost pump. Repair of this wiring harness is not permitted. (2) Implications of changing this feature: Repair of a damaged boost pump wiring harness using splices creates joints ln the wiring. Failure of these joints could lead to electrical sparking (arcing) inside the fuel tank. Damaged boost pump wiring should be corrected by complete replacement of the affected harness. {3) Instructions for retaining this feature: Issued on March 19, 2025. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. DEPARTMENT OF TRANSPORTATION [FR Doc. 2025–04983 Filed 3–24–25; 8:45 am] [Docket No. FAA–2025–0107; Airspace Docket No. 25–ASO–1] BILLING CODE 4910–13–C Federal Aviation Administration Amendment of Class D Airspace; Jupiter, FL Federal Aviation Administration (FAA), DOT. AGENCY: 16:37 Mar 24, 2025 Jkt 265001 PO 00000 Frm 00014 Fmt 4702 This action proposes to amend Class D airspace extending upward from the surface to and including 2,500 feet MSL within a 4.5mile radius of William P. Gwinn Airport, beginning at the 205° bearing from the airport clockwise to the 145° bearing, thence to the beginning point. Controlled airspace is necessary for the safety and management of instrument flight rules (IFR) operations in the area. SUMMARY: 14 CFR Part 71 RIN 2120–AA66 VerDate Sep<11>2014 Notice of proposed rulemaking (NPRM). ACTION: Sfmt 4702 E:\FR\FM\25MRP1.SGM 25MRP1 EP25MR25.006</GPH> ddrumheller on DSK120RN23PROD with PROPOSALS1 The boost pump wiring should not be modified in any way. The type design specified by l'lodifieation JM41672 must be maintained, and is a CDCCL. Harness replacement should be carried out in accordance with AMM Ch 20.

Agencies

[Federal Register Volume 90, Number 56 (Tuesday, March 25, 2025)]
[Proposed Rules]
[Pages 13561-13571]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2025-04983]



[[Page 13561]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-0339; Project Identifier MCAI-2024-00450-T]
RIN 2120-AA64


Airworthiness Directives; BAE Systems (Operations) Limited 
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 
2023-02-06, which applies to all BAE Systems (Operations) Limited Model 
4101 airplanes. AD 2023-02-06 requires revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive airworthiness limitations. Since the FAA issued AD 
2023-02-06, the FAA has determined that new or more restrictive 
airworthiness limitations are necessary. This proposed AD would 
continue to require certain actions in AD 2023-02-06 and require 
revising the existing maintenance or inspection program, as applicable, 
to incorporate new or more restrictive airworthiness limitations. The 
FAA is proposing this AD to address the unsafe condition on these 
products.

DATES: The FAA must receive comments on this NPRM by May 9, 2025.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to regulations.gov. Follow 
the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2025-0339; or in person at Docket Operations between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD 
docket contains this NPRM, the mandatory continuing airworthiness 
information (MCAI), any comments received, and other information. The 
street address for Docket Operations is listed above.
    Material Incorporated by Reference:
     For material identified in this proposed 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 
[email protected]; website baesystems.com/en/our-company/our-businesses/regional-aircraft/about-us.
     You may view this material 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.

FOR FURTHER INFORMATION CONTACT: Todd Thompson, Aviation Safety 
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 206-231-3228; email [email protected].

SUPPLEMENTARY INFORMATION: 

Comments Invited

    The FAA invites you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2025-0339; 
Project Identifier MCAI-2024-00450-T'' at the beginning of your 
comments. The most helpful comments reference a specific portion of the 
proposal, 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 the proposal because of those comments.
    Except 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 
regulations.gov, including any personal information you provide. The 
agency will also post a report summarizing each substantive verbal 
contact received about this NPRM.

Confidential Business Information

    CBI 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 NPRM 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 NPRM, 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 NPRM. Submissions containing CBI should be sent to Todd 
Thompson, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 
410, Westbury, NY 11590; telephone 206-231-3228; email 
[email protected]. Any commentary that the FAA receives that is not 
specifically designated as CBI will be placed in the public docket for 
this rulemaking.

Background

    The FAA issued AD 2023-02-06, Amendment 39-22313 (88 FR 7851, 
February 7, 2023) (AD 2023-02-06), for all BAE Systems (Operations) 
Limited Model 4101 airplanes. AD 2023-02-06 was prompted by an MCAI 
originated by the Civil Aviation Authority (CAA), which is the aviation 
authority for the United Kingdom (UK) (UK CAA). The UK CAA issued AD G-
2022-0006, dated March 30, 2022 (UK CAA AD G-2022-0006), to correct an 
unsafe condition.
    AD 2023-02-06 requires revising the existing maintenance or 
inspection program, as applicable, to incorporate new or more 
restrictive airworthiness limitations. The FAA issued AD 2023-02-06 to 
address fatigue damage of various airplane structures and failure of 
certain structurally significant items, which could result in reduced 
structural integrity of the airplane. The FAA also issued AD 2023-02-06 
to address fuel vapor ignition sources, which could result in a fuel 
tank explosion and consequent loss of the airplane.

Actions Since AD 2023-02-06 Was Issued

    Since the FAA issued AD 2023-02-06, the UK CAA superseded AD G-
2022-0006, and issued UK CAA AD G-2024-0003, dated August 6, 2024; 
corrected August 14, 2024 (UK CAA AD G-2024-0003) (also referred to as 
the MCAI), to correct an unsafe condition on all BAE Systems 
(Operations) Limited Model 4101 airplanes. The MCAI states new or more 
restrictive airworthiness limitations have been developed.
    The FAA is proposing this AD to address the unsafe condition on 
these products.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2025-0339.

[[Page 13562]]

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed Subject 05-10-10, ``Airworthiness Limitations,'' 
of Chapter 05, ``Airworthiness Limitations,'' of BAE Systems 
(Operations) Limited J41 Aircraft Maintenance Manual (AMM), Revision 
46, dated February 20, 2024. This service information specifies 
airworthiness limitations for life-limited parts and structurally 
significant items.
    This proposed AD would also require Chapter 05, ``Airworthiness 
Limitations,'' of BAE Systems (Operations) Limited J41 Aircraft 
Maintenance Manual (AMM), Effectivity Group 403, Revision 44, dated 
June 15, 2021; and Chapter 05, ``Airworthiness Limitations,'' of BAE 
Systems (Operations) Limited J41 AMM, Effectivity Group 408, Revision 
44, dated June 15, 2021; which the Director of the Federal Register 
approved for incorporation by reference as of March 14, 2023 (88 FR 
7851, February 7, 2023). ``Effectivity Group'' is not specifically 
stated on these documents. However, ``403'' and ``408,'' which are 
stated on the pages of the applicable documents (except for the title 
pages), refer to the effective groups of airplanes specified within the 
fleet code listings.
    This 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.

Other Related Material

    The FAA also reviewed Subject 05-10-20, ``Certification Maintenance 
Requirements,'' of Chapter 05, ``Airworthiness Limitations,'' and 
Subject 05-10-30, ``Critical Design Configuration Control Limitations 
(CDCCL)--Fuel System,'' of Chapter 05, ``Airworthiness Limitations,'' 
of BAE Systems (Operations) Limited J41 Aircraft Maintenance Manual 
(AMM), Revision 45, dated December 15, 2023. This service information 
specifies airworthiness limitations for certification maintenance 
requirements and fuel tank systems, which are specified in appendices A 
and B of this proposed AD.

FAA's Determination

    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 and 
material referenced above. The FAA is issuing this NPRM after 
determining that the unsafe condition described previously is likely to 
exist or develop on other products of the same type design.

Proposed Requirements of This NPRM

    This proposed AD would retain certain requirements of AD 2023-02-
06. This proposed AD would also require revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive airworthiness limitations.
    This proposed AD would require revisions to certain operator 
maintenance documents to include new actions (e.g., inspections) and 
Critical Design Configuration Control Limitations (CDCCLs). Compliance 
with these actions and CDCCLs is required by 14 CFR 91.403(c). For 
airplanes that have been previously modified, altered, or repaired in 
the areas addressed by this proposed AD, the operator may not be able 
to accomplish the actions described in the revisions. In this 
situation, to comply with 14 CFR 91.403(c), the operator must request 
approval for an alternative method of compliance according to paragraph 
(k)(1) of this proposed AD.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 4 airplanes of U.S. registry. The FAA estimates the following 
costs to comply with this proposed AD:
    The FAA estimates the total cost per operator for the retained 
actions from AD 2023-02-06 to be $7,650 (90 work-hours x $85 per work-
hour).
    The FAA has determined that revising the maintenance or inspection 
program takes an average of 90 work-hours per operator, although the 
agency recognizes that this number may vary from operator to operator. 
Since operators incorporate maintenance or inspection program changes 
for their affected fleet(s), the FAA has determined that a per-operator 
estimate is more accurate than a per-airplane estimate. Therefore, the 
agency estimates the average total cost per operator to be $7,650 (90 
work-hours x $85 per work-hour).
    The FAA estimates the total cost per operator for the new proposed 
actions to be $7,650 (90 work-hours x $85 per work-hour).

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

    The FAA determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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 this proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Would not affect intrastate aviation in Alaska, and
    (3) Would 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 Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by:
0
a. Removing Airworthiness Directive (AD) 2023-02-06, Amendment 39-22313 
(88 FR 7851, February 7, 2023); and
0
b. Adding the following new AD:

BAE Systems (Operations) Limited: Docket No. FAA-2025-0339; Project 
Identifier MCAI-2024-00450-T.

[[Page 13563]]

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by May 9, 2025.

(b) Affected ADs

    This AD replaces AD 2023-02-06, Amendment 39-22313 (88 FR 7851, 
February 7, 2023) (AD 2023-02-06).

(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 05, Time Limits/
Maintenance Checks.

(e) Unsafe Condition

    This AD was prompted by a determination that new or more 
restrictive airworthiness limitations are necessary. The FAA is 
issuing this AD to address fatigue damage of various airplane 
structures and failure of certain structurally significant items, 
which could result in reduced structural integrity of the airplane. 
The FAA is also issuing this AD to address fuel vapor ignition 
sources, which could result in a fuel tank explosion and consequent 
loss of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Retained Revision of the Existing Maintenance or Inspection 
Program, With a Terminating Action

    This paragraph restates the requirements of paragraph (m) of AD 
2023-02-06, with a new terminating action. Within 90 days after 
March 14, 2023 (the effective date of AD 2023-02-06): Revise the 
existing maintenance or inspection program, as applicable, by 
incorporating Subjects 05-10-10, ``Airworthiness Limitations''; 05-
10-20, ``Certification Maintenance Requirements''; and 05-10-30, 
``Critical Design Configuration Control Limitations (CDCCL)--Fuel 
System''; of Chapter 05, ``Airworthiness Limitations,'' of the BAE 
Systems (Operations) Limited J41 Aircraft Maintenance Manual (AMM), 
Effectivity Group 403, Revision 44, dated June 15, 2021; or BAE 
Systems (Operations) Limited J41 AMM, Effectivity Group 408, 
Revision 44, dated June 15, 2021; as applicable. The initial 
compliance times for the tasks are at the applicable times specified 
in paragraphs (g)(1) through (3) of this AD. Accomplishing the 
revision of the existing maintenance or inspection program required 
by paragraph (i) of this AD terminates the requirements of this 
paragraph.
    (1) For replacement tasks of life limited parts specified in 
Subject 05-10-10, ``Airworthiness Limitations,'' of Chapter 05, 
``Airworthiness Limitations,'' of the BAE Systems (Operations) 
Limited J41 AMM, Effectivity Group 403, Revision 44, dated June 15, 
2021; or BAE Systems (Operations) Limited J41 AMM, Effectivity Group 
408, Revision 44, dated June 15, 2021; as applicable: Prior to the 
applicable flight cycles (landings) or flight hours (flying hours) 
on the part specified in the ``Mandatory Life Limits'' column in 
Subject 05-10-10, or within 90 days after March 14, 2023, whichever 
occurs later.
    (2) For structurally significant item tasks specified in Subject 
05-10-10, ``Airworthiness Limitations,'' of Chapter 05, 
``Airworthiness Limitations,'' of the BAE Systems (Operations) 
Limited J41 AMM, Effectivity Group 403, Revision 44, dated June 15, 
2021; or BAE Systems (Operations) Limited J41 AMM, Effectivity Group 
408, Revision 44, dated June 15, 2021; as applicable: Prior to the 
accumulation of the applicable flight cycles specified in the 
``Initial Inspection'' column in Subject 05-10-10, or within 90 days 
after March 14, 2023, whichever occurs later.
    (3) For certification maintenance requirements tasks specified 
in Subject 05-10-20, ``Certification Maintenance Requirements,'' of 
Chapter 05, ``Airworthiness Limitations,'' of the BAE Systems 
(Operations) Limited J41 AMM, Effectivity Group 403, Revision 44, 
dated June 15, 2021; or BAE Systems (Operations) Limited J41 AMM, 
Effectivity Group 408, Revision 44, dated June 15, 2021; as 
applicable: Prior to the accumulation of the applicable flight hours 
specified in the ``Time Between Checks'' column in Subject 05-10-20, 
or within 90 days after March 14, 2023, whichever occurs later; 
except for tasks that specify ``first flight of the day'' in the 
``Time Between Checks'' column in Subject 05-10-20, the initial 
compliance time is the first flight of the next day after 
accomplishing the revision required by paragraph (g) of this AD, or 
within 90 days after March 14, 2023, whichever occurs later.

(h) Retained No Alternative Actions, Intervals, or CDCCLs, With New 
Exception

    This paragraph restates the requirements of paragraph (n) of AD 
2023-02-06, with new exception. Except as required by paragraph (i) 
of this AD: After the existing maintenance or inspection program has 
been revised as required by paragraph (g) of this AD, no alternative 
actions (e.g., inspections), intervals, or CDCCLs may be used unless 
the actions, intervals, and CDCCLs are approved as an AMOC in 
accordance with the procedures specified in paragraph (k)(1) of this 
AD.

(i) New Revision of the Existing Maintenance or Inspection Program

    Within 90 days after the effective date of this AD, revise the 
existing maintenance or inspection program, as applicable, as 
specified in paragraphs (i)(1) and (2) of this AD. Accomplishing the 
revision of the existing maintenance or inspection program required 
by this paragraph terminates the actions required by paragraph (g) 
of this AD.
    (1) Revise the existing maintenance or inspection program, as 
applicable, to incorporate the information specified in Subject 05-
10-10, ``Airworthiness Limitations,'' of Chapter 05, ``Airworthiness 
Limitations,'' of BAE Systems (Operations) Limited J41 AMM, Revision 
46, dated February 20, 2024. The initial compliance time for doing 
the tasks is at the applicable times specified in paragraphs 
(i)(1)(i) and (ii) of this AD.
    (i) For replacement tasks of life limited parts specified in 
Subject 05-10-10, ``Airworthiness Limitations,'' of Chapter 05, 
``Airworthiness Limitations,'' of BAE Systems (Operations) Limited 
J41 AMM, Revision 46, dated February 20, 2024: Prior to the 
applicable flight cycles (landings) or flight hours (flying hours) 
on the part specified in the ``Mandatory Life Limits'' column in 
Subject 05-10-10, or within 90 days after the effective date of this 
AD, whichever occurs later.
    (ii) For structurally significant item tasks specified in 
Subject 05-10-10, ``Airworthiness Limitations,'' of Chapter 05, 
``Airworthiness Limitations,'' of BAE Systems (Operations) Limited 
J41 AMM, Revision 46, dated February 20, 2024: Prior to the 
accumulation of the applicable flight cycles (flights) or years 
specified in the ``Initial Inspection'' column in Subject 05-10-10, 
or within 90 days after the effective date of this AD, whichever 
occurs later.
    (2) Revise the existing maintenance or inspection program, as 
applicable, to incorporate the information in appendix A to this 
AD--Subject 05-10-20, ``Certification Maintenance Requirements,'' 
and in appendix B to this AD--Subject 05-10-30, ``Critical Design 
Configuration Control Limitations (CDCCL)--Fuel System.'' The 
initial compliance time for doing the certification maintenance 
requirements tasks specified in Subject 05-10-20, ``Certification 
Maintenance Requirements'' (appendix A) is prior to the accumulation 
of the applicable flight hours specified in the ``Time Between 
Checks'' column in Subject 05-10-20, or within 90 days after the 
effective date of this AD, whichever occurs later; except for tasks 
that specify ``first flight of the day'' in the ``Time Between 
Checks'' column in Subject 05-10-20, the initial compliance time is 
the first flight of the next day after accomplishing the revision 
required by paragraph (i) of this AD, or within 90 days after the 
effective date of this AD, whichever occurs later.

(j) New No Alternative Actions, Intervals, or CDCCLs

    After the existing maintenance or inspection program has been 
revised as required by paragraph (i) of this AD, no alternative 
actions (e.g., inspections), intervals, or CDCCLs may be used unless 
the actions, intervals, and CDCCLs are approved as an alternative 
method of compliance (AMOC) in accordance with the procedures 
specified in paragraph (k)(1) of this AD.

(k) 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 of the 
International Validation Branch, send it to the attention of the 
person identified in paragraph (l) of this AD and email to: 
[email protected]. Before using any

[[Page 13564]]

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 UK CAA; or BAE Systems (Operations) 
Limited's UK CAA Design Organization Approval (DOA). If approved by 
the DOA, the approval must include the DOA-authorized signature.

(l) Additional Information

    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 
[email protected].

(m) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the material listed in this 
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this material as applicable to do the actions 
required by this AD, unless this AD specifies otherwise.
    (3) The following material was approved for IBR on [DATE 35 DAYS 
AFTER PUBLICATION OF THE FINAL RULE].
    (i) Subject 05-10-10, ``Airworthiness Limitations,'' of Chapter 
05, ``Airworthiness Limitations,'' of BAE Systems (Operations) 
Limited J41 Aircraft Maintenance Manual (AMM), Revision 46, dated 
February 20, 2024.
    (ii) [Reserved]
    (4) The following material was approved for IBR on March 14, 
2023 (88 FR 7851, February 7, 2023).
    (i) Chapter 05, ``Airworthiness Limitations,'' of BAE Systems 
(Operations) Limited J41 AMM, Effectivity Group 403, Revision 44, 
dated June 15, 2021.
    Note 1 to paragraph (m)(4)(i): This note applies to paragraphs 
(m)(4)(i) and (ii) of this AD. Page 1 of the ``Publications 
Transmittal'' is the only page that shows the revision level of this 
document.
    Note 2 to paragraph (m)(4)(i): This note applies to paragraphs 
(m)(4)(i) and (ii) of this AD. ``Effectivity Group'' is not 
specifically stated on the document. However, ``403'' and ``408,'' 
which are stated on the pages of the applicable documents (except 
for the title pages), refer to the effective groups of airplanes 
specified within the fleet code listings.
    (ii) Chapter 05, ``Airworthiness Limitations,'' of BAE Systems 
(Operations) Limited J41 AMM, Effectivity Group 408, Revision 44, 
dated June 15, 2021.
    (5) For material 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 
[email protected]; website baesystems.com/en/our-company/our-businesses/regional-aircraft/about-us.
    (6) You may view this material 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.
    (7) You may view this material at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].

Appendix A to BAE Systems (Operations) Limited: Docket No. FAA-2025-
0339; Project Identifier MCAI-2024-00450-T--Subject 05-10-20, 
``Certification Maintenance Requirements''

BILLING CODE 4910-13-P

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Appendix B to BAE Systems (Operations) Limited: Docket No. FAA-2025-
0339; Project Identifier MCAI-2024-00450-T--Subject 05-10-30, 
``Critical Design Configuration Control Limitations (CDCCL)--Fuel 
System''
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[[Page 13571]]


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    Issued on March 19, 2025.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2025-04983 Filed 3-24-25; 8:45 am]
BILLING CODE 4910-13-C
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