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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: 2026-14-10 Textron Aviation Inc.: Amendment 39-23411; Docket No. FAA-2026-7217; Project Identifier AD-2025-01364-A. (a) Effective Date This airworthiness directive (AD) is effective August 18, 2026. (b) Affected ADs None. (c) Applicability This AD applies to Textron Aviation Inc. Model 408 airplanes, serial numbers -0012 through -0051, certificated in any category. (d) Subject Joint Aircraft System Component (JASC) Code 5530, Vertical Stabilizer Structure; 5510, Horizontal Stabilizer Structure. (e) Unsafe Condition This AD was prompted by the manufacturer's revision of the aircraft maintenance manual (AMM) to introduce a detailed inspection for the horizontal stabilizer spar, and a change to the airplane serial effectivity for the vertical stabilizer spar detailed inspection. The FAA is issuing this AD to detect and address cracks in the horizontal and vertical stabilizers forward and aft spars. The unsafe condition, if not addressed, could result in reduced structural integrity of the airplane or reduced controllability of the airplane with possible loss of control of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Airworthiness Limitations Section (ALS) Revision Within 150 hours time-in-service or 12 months after the effective date of this AD, whichever occurs first: Revise the ALS of the existing AMM or instructions for continued airworthiness and the existing approved maintenance or inspection program, as applicable, by incorporating the information identified in table 1 to paragraph (g) of this AD. Table 1 to Paragraph ( g )-Revised Model 408 Airworthiness Limitation Tasks Task number Task title Interval Inspection document Zone Serial effectivity 55-10-00-221 Horizontal Stabilizer Spar Detailed Inspection 1600 flight hours 4-12-MB 351, 352 -0012 through -0040. 55-30-00-221 Vertical Stabilizer Spar Detailed Inspection 1600 flight hours 4-12-MB 341, 342, 343 -0012 through -0051. Note 1 to paragraph (g): Additional guidance for accomplishing the actions required by this AD can be found in Textron Aviation Inc. Service Letter SL408-04-01, dated December 8, 2025. (h) Provisions for Alternative Actions and Intervals After the action required by paragraph (g) of this AD has been performed, no alternative actions and associated thresholds and intervals are allowed unless they are approved as specified in the provisions of paragraph (i) of this AD. (i) Alternative Methods of Compliance (AMOCs) (1) The Manager, Central Certification 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 of the Central Certification Branch, send it to the attention of the person identified in paragraph (j)(1) of this AD and email to: 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. (j) Additional Information (1) For more information about this AD, contact Soban Saeed, Aviation Safety Engineer, FAA, 1801 South Airport Road, Wichita, KS 67209; phone: (316) 946-4123; email: CCB-COS@faa.gov. (2) For material identified in this AD that is not incorporated by reference, contact Textron Aviation Inc., P.O. Box 7706, Wichita, KS 67277; phone: (316) 517-6215; email: citationpubs@txtav.com; website: ww2.txtav.com/technicalpublications/. (k) Material Incorporated by Reference None. Issued on July 9, 2026. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2026-14109 Filed 7-13-26; 8:45 am]BILLING CODE 4910-13-P
