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1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2024-12-04 Pratt & Whitney: Amendment 39-22768; Docket No. FAA-2023-1640; Project Identifier AD-2022-00283-E. (a) Effective Date This airworthiness directive (AD) is effective August 13, 2024. (b) Affected ADs None. (c) Applicability This AD applies to Pratt & Whitney (PW) Model PW2037, PW2037M, and PW2040 engines with a high-pressure turbine (HPT) 2nd stage blade assembly, part number (P/N) 1B7522 installed. (d) Subject Joint Aircraft System Component (JASC) Code 7250, Turbine Section. (e) Unsafe Condition This AD was prompted by an in-flight shutdown caused by the fracture of HPT 2nd stage turbine hub assembly lugs. The FAA is issuing this AD to prevent failure of the HPT 2nd stage turbine hub assembly lug and HPT 2nd stage blade assemblies. The unsafe condition, if not addressed, could result in the uncontained release of the HPT 2nd stage blade assemblies, damage to the engine, and damage to the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions Before exceeding the applicable compliance times specified in Planning Information, Compliance, page 2, of PW Alert Service Bulletin PW2000 A72-777, Revision 2, dated April 11, 2023 (PW2000 A72-777, Rev. 2), or before accumulating 500 cycles after the effective date of this AD, whichever occurs later, perform all applicable actions identified as "RC" (required for compliance) in, and in accordance with, the Accomplishment Instructions of PW2000 A72-777, Rev. 2. (h) Credit for Previous Actions You may take credit for the inspections required by paragraph (g) of this AD if you performed those inspections before the effective date of this AD using PW Alert Service Bulletin PW2000 A72-777, Revision 1, dated December 21, 2022, PW Special Instruction (SI) NO. 62F-21, Initial Issue, dated June 7, 2021, or PW SI NO. 62F-21A, dated October 4, 2021. You may take credit for the inspection specified in Section 1, paragraph 1.B. of the Accomplishment Instructions of PW2000 A72-777, Rev. 2, which is required by paragraph (g) of this AD, if you performed the inspection before the effective date of this AD using PW SI NO. 73F-21, Initial Issue, dated April 6, 2021, or PW SI NO. 73F-21, Revision A, dated September 29, 2021. (i) Alternative Methods of Compliance (AMOCs) (1) The Manager, AIR-520 Continued Operational Safety 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 local Flight Standards District Office, as appropriate. If sending information directly to the Manager, AIR-520 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (j) of this AD and email to: ANE-AD-AMOC@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. (3) For service information that contains steps that are labeled as Required for Compliance (RC), the following provisions apply. (i) The steps labeled as RC, including substeps under an RC step and any figures identified in an RC step, must be done to comply with the AD. An AMOC is required for any deviations to RC steps, including substeps and identified figures. (ii) Steps not labeled as RC may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC, provided the RC steps, including substeps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition. (j) Additional Information For more information about this AD, contact Carol Nguyen, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-7655; email: carol.nguyen@faa.gov. (k) 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 the AD specifies otherwise. (i) Pratt & Whitney Alert Service Bulletin PW2000 A72-777, Revision 2, dated April 11, 2023. (ii) [Reserved] (3) For Pratt & Whitney service information, contact Pratt & Whitney, 400 Main Street, East Hartford, CT 06118; phone: (800) 565-0140; email: help24@pw.utc.com; website: connect.prattwhitney.com. (4) You may view this service information at FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (817) 222-5110. (5) 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. Issued on June 11, 2024. Suzanne Masterson, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2024-14936 Filed 7-8-24; 8:45 am]BILLING CODE 4910-13-P
