Airworthiness Directives; The Boeing Company Airplanes

<RULE> DEPARTMENT OF TRANSPORTATION <SUBAGY>Federal Aviation Administration</SUBAGY> <CFR>14 CFR Part 39</CFR> <DEPDOC>[Docket FAA-2023-2234; Project Identifier AD-2023-00963-T; Amendment 39-22960; AD 2025-04-02]</DEPDOC> <RIN>RIN 2120-AA64</RIN> <SUBJECT>Airworthiness Directives; The Boeing Company Airplanes</SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Federal Aviation Administration (FAA), DOT. <HD SOURCE="HED">ACTION:</HD> Final rule; correction. <SUM> <HD SOURCE="HED">SUMMARY:</HD> The FAA is correcting an airworthiness directive (AD) that was published in the <E T="04">Federal Register</E> . That AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. As published, the service information referenced in certain paragraphs of the regulatory text is incorrect, and the dates specified in the “System Airworthiness Limitation No. 3—Fan Blade Out Conditions” text and “System Airworthiness Limitation No. 4—Engine Nacelle Maintenance Errors” text of figure 1 to paragraph (j) of the regulatory text are incorrect. This document corrects those errors. In all other respects, the original document remains the same. </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> This correction is effective April 8, 2025. The effective date of AD 2025-04-02 remains April 8, 2025. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of April 8, 2025 (90 FR 11109, March 4, 2025). </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> <E T="03">AD Docket:</E> You may examine the AD docket at <E T="03">regulations.gov</E> by searching for and locating Docket No. FAA-2023-2234; 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 final rule, any comments received, and other information. The street address for Docket Operations is listed above. <E T="03">Material Incorporated by Reference:</E> • For Boeing material identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; website <E T="03">myboeingfleet.com.</E> • 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. It is also available at <E T="03">regulations.gov</E> under Docket No. FAA-2023-2234. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> Luis Cortez-Muniz, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; telephone: 206-231-3958; email: <E T="03">luis.a.cortez-muniz@faa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> AD 2025-04-02, Amendment 39-22960 (90 FR 11109, March 4, 2025) (AD 2025-04-02), requires replacing the fasteners on the fan cowl support beam hinge fittings for certain airplanes and, for all airplanes, requires modifying the radial restraint assembly and installing an external doubler at the starter vent, or as an option, installing a serviceable fan cowl. AD 2025-04-02 also requires revising the existing maintenance or inspection program, as applicable, to incorporate new airworthiness limitations. AD 2025-04-02 applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. <HD SOURCE="HD1">Need for Correction</HD> As published, the service information referenced in certain paragraphs of the regulatory text is incorrect, and the dates specified in the “System Airworthiness Limitation No. 3—Fan Blade Out Conditions” text and “System Airworthiness Limitation No. 4—Engine Nacelle Maintenance Errors” text of figure 1 to paragraph (j) of the regulatory text are incorrect. Paragraphs (h)(4), (h)(5), and (h)(7) of the regulatory text inadvertently referred to “Boeing Special Attention Requirements Bulletin 737-71-1938 RB, Revision 1, dated June 27, 2024,” instead of “Boeing Special Attention Requirements Bulletin 737-71-1937 RB, Revision 1, dated June 27, 2024.” Paragraph (h)(4) of the regulatory text also inadvertently referred to “Collins Aerospace Service Bulletin 737NG-71-007,” instead of “Collins Aerospace Service Bulletin 737NG-71-008,” and inadvertently referred to “Material Necessary for Each Inlet Assembly” instead of “Material Necessary for Each Component.” Paragraph (h)(7) of the regulatory text also included a reference to Collins Service Bulletin 737NG-71-008 but inadvertently included a date of “July 28, 2023” that is not necessary since the paragraph is referring to the Collins Service Bulletin 737NG-71-008 identified in Boeing Special Attention Requirements Bulletin 737-71-1937 RB, Revision 1, dated June 27, 2024, and should match how paragraphs (h)(4) and (5) of the regulatory text refer to Collins Service Bulletin 737NG-71-008 without a date. Paragraph (j) of the regulatory text inadvertently included a reference to Boeing Special Attention Requirements Bulletin 737-71-1937 RB with the date of “June 27, 2024” instead of “July 27, 2023.” In addition, the date specified in the “System Airworthiness Limitation No. 3—Fan Blade Out Conditions” text of figure 1 to paragraph (j) of the regulatory text inadvertently referred to “July 31, 2018” instead of “July 31, 2028,” and the date specified in the “System Airworthiness Limitation No. 4—Engine Nacelle Maintenance Errors” text of figure 1 to paragraph (j) of the regulatory text inadvertently referred to “December 31, 2019” instead of “December 31, 2029.” <HD SOURCE="HD1">Material Incorporated by Reference Under 1 CFR Part 51</HD> The FAA reviewed Boeing Special Attention Requirements Bulletin 737-71-1937 RB, Revision 1, dated June 27, 2024. This material specifies procedures for replacing, for certain airplanes, the fasteners on the fan cowl support beam hinge fittings on the left and right engine strut, and, for engine 1 and engine 2 for all airplanes, modifying the radial restraint assembly and installing an external doubler at the starter vent, or as an option, installing a serviceable fan cowl. This material also specifies procedures to incorporate Boeing 737-600/700/700C/800/900/900ER Airworthiness Limitations (AWLs) Document D626A001-9-01 “System Airworthiness Limitation No. 2—Fan Blade Out Conditions,” “System Airworthiness Limitation No. 3—Fan Blade Out Conditions,” and “System Airworthiness Limitation No. 4—Engine Nacelle Maintenance Errors” into the operator's maintenance or inspection program. 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 <E T="02">ADDRESSES</E> . <HD SOURCE="HD1">Correction of Publication</HD> This document corrects several errors and correctly adds the AD as an amendment to 14 CFR 39.13. Although no part of the preamble and no other part of the regulatory information has been corrected, the FAA is publishing the entire rule in the <E T="04">Federal Register</E> . The effective date of this AD remains April 8, 2025. Since this action only corrects service information referenced in paragraphs that provide relief to the required actions and corrects a date for an airworthiness limitation by specifying a later date, it has no adverse economic impact and imposes no additional burden on any person. Therefore, the FAA has determined that notice and public comment procedures are unnecessary. <LSTSUB> <HD SOURCE="HED">List of Subjects in 14 CFR Part 39</HD> Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. </LSTSUB> <HD SOURCE="HD1">Adoption of the Amendment</HD> Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: <HD SOURCE="HED">PART 39—AIRWORTHINESS DIRECTIVES</HD> <REGTEXT TITLE="14" PART="39"> 1. The authority citation for part 39 continues to read as follows: <HD SOURCE="HED">Authority: </HD> 49 U.S.C. 106(f), 40113, 44701. </REGTEXT> <SECTION> <SECTNO>§ 39.13 </SECTNO> <SUBJECT>[Corrected]</SUBJECT> </SECTION> <REGTEXT TITLE="14" PART="39"> 2. The FAA amends § 39.13 by adding the following new airworthiness directive: <EXTRACT> <FP SOURCE="FP-2"> <E T="04">2025-04-02 The Boeing Company:</E> Amendment 39-22960; Docket No. FAA-2023-2234; Project Identifier AD-2023-00963-T. </FP> <HD SOURCE="HD1">(a) Effective Date</HD> This airworthiness directive (AD) is effective April 8, 2025. <HD SOURCE="HD1">(b) Affected ADs</HD> None. <HD SOURCE="HD1">(c) Applicability</HD> This AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category. <HD SOURCE="HD1">(d) Subject</HD> Air Transport Association (ATA) of America Code 71, Powerplant. <HD SOURCE="HD1">(e) Unsafe Condition</HD> This AD was prompted by two engine fan blade-out (FBO) events that resulted in the separation of engine inlet cowl and fan cowl parts from the airplane. In one event, fan cowl parts damaged the fuselage, which caused loss of pressurization and subsequent emergency descent. The FAA is issuing this AD to address fan cowls that are not strengthened, which, in the event of an FBO occurrence, could depart the nacelle potentially damaging a stabilizer, or the fan cowl striking the fuselage and window. The unsafe condition, if not addressed, could result in loss of control of the airplane, or in a rapid decompression and hazard to window-seated passengers aft of the wing. <HD SOURCE="HD1">(f) Compliance</HD> Comply with this AD within the compliance times specified, unless already done. <HD SOURCE="HD1">(g ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 20k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━