2026-18-06: Time limits/Maintenance checks

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: a. Removing Airworthiness Directive (AD) 2025-15-04, Amendment 39-23091 (90 FR 37786, August 6, 2025); and b. Adding the following new AD: 2026-18-06 Gulfstream Aerospace LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.): Amendment 39-23461; Docket No. FAA-2026-4654; Project Identifier MCAI-2026-00346-T. (a) Effective Date This airworthiness directive (AD) is effective October 16, 2026. (b) Affected ADs This AD replaces AD 2025-15-04, Amendment 39-23091 (90 FR 37786, August 6, 2025) (AD 2025-15-04). (c) Applicability This AD applies to all Gulfstream Aerospace (Type Certificate previously held by Israel Aircraft Industries, Ltd.) LP Model Gulfstream G150 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 in principal structural elements of the horizontal stabilizer and elevator systems, and to prevent failure of the nose landing gear (NLG) actuator to strut attachment pin. The unsafe condition, if not addressed, could result in undetected fatigue cracking in critical empennage structural components, loss of elevator control authority, and reduced structural integrity of the airplane, or the failure of the NLG to properly retract and lock after takeoff or extend and lock before landing. (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 New Terminating Action This paragraph restates the requirements of paragraph (g) of AD 2025-15-04, with a new terminating action. Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, Civil Aviation Authority of Israel (CAAI) AD ISR I-32-24-10-01R1, revised October 15, 2024 (CAAI AD ISR I-32-24-10-01R1). Accomplishing the revision of the existing maintenance or inspection program required by paragraph (j) of this AD terminates the requirements of this paragraph. (h) Retained Exceptions to CAAI AD ISR I 32 24-10-01R1, With No Changes This paragraph restates the exceptions specified in paragraph (h) of AD 2025-15-04, with no changes. (1) Where CAAI AD ISR I-32-24-10-01R1 refers to its effective date, this AD requires using September 10, 2025 (the effective date of AD 2025-15-04). (2) The initial compliance time for doing the task specified in the Action paragraph of CAAI AD ISR I-32-24-10-01R1 is at the applicable "discard" interval as specified in the material referenced in the Action paragraph of CAAI AD ISR I-32-24-10-01R1, or within 3 months after September 10, 2025 (the effective date of AD 2025-15-04), whichever occurs later. (3) Where the Action paragraph of CAAI AD ISR I-32-24-10-01R1 specifies to "incorporate AMM Revision 29", this AD requires replacing that text with "revise the existing maintenance or inspection program, as applicable, by incorporating the Nose Landing Gear Actuator to Nose Landing Gear Strut Attachment Pin task identified in AMM Revision 29". (i) Retained Provisions for Alternative Actions and Intervals, With a New Exception This paragraph restates the requirements of paragraph (i) of AD 2025-15-04, with a new exception. Except as required by paragraph (j) 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) or intervals are allowed unless they are approved as specified in the provisions of paragraph (m)(1) of this AD. (j) New Requirements Except as specified in paragraph (k) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, CAAI AD ISR I-05-2025-10-1, October 15, 2025 (CAAI AD ISR I-05-2025-10-1). Accomplishing the revision of the existing maintenance or inspection program required by this paragraph terminates the requirements of paragraph (g) of this AD. (k) Exceptions to CAAI AD ISR I-05-2025-10-1 (1) Where CAAI AD ISR I-05-2025-10-1 refers to its effective date, this AD requires using the effective date of this AD. (2) Where the Action paragraph of CAAI AD ISR I-05-2025-10-1 specifies to "incorporate AMM Revision 30", this AD requires replacing the text with "revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in Section 05-10-10 Airworthiness Limitations, Chapter 05 Time Limits/Maintenance Checks, Gulfstream G150 Maintenance Manual, Revision 30, dated September 15, 2025". (3) The initial compliance time for doing the tasks specified in the material referenced in the Action paragraph of CAAI AD ISR I-05-2025-10-1 is at the applicable initial inspection interval, comply within time, or discard interval specified in the material referenced in the Action paragraph of CAAI AD ISR I-05-2025-10-1, or within 90 days after the effective date of this AD, whichever occurs later. (l) New Provisions for Alternative Actions and Intervals After the existing maintenance or inspection program has been revised as required by paragraph (j) of this AD, no alternative actions ( e.g., inspections) and intervals are allowed unless they are approved as specified in the provisions of the Action paragraph of CAAI AD ISR I-05-2025-10-1. (m) 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 local Flight Standards District 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 (n) of this AD and email to: [email protected]. 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 CAAI; or CAAI's authorized Designee. If approved by the CAAI Designee, the approval must include the Designee's authorized signature. (n) Additional Information For more information about this AD, contact Frank Huynh, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 404-983-5288; email: [email protected]. (o) 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 the AD specifies otherwise. (3) The following material was approved for IBR on October 16, 2026. (i) Civil Aviation Authority of Israel (CAAI) AD ISR I-05-2025-10-1, dated October 15, 2025. (ii) [Reserved] (4) The following material was approved for IBR on September 10, 2025 (90 FR 37786, August 6, 2025). (i) Civil Aviation Authority of Israel (CAAI) AD ISR I-32-24-10-01R1, revised October 15, 2024. (ii) [Reserved] (5) For CAAI material identified in this AD, contact CAAI, P.O. Box 1101, Golan Street, Airport City, 70100, Israel; telephone 972-3-9774665; fax 972-3-9774592; email [email protected]. You may find this material on the CAAI website at www.gov.il/en/pages/israeli-airworthiness-directives. (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]. Issued on August 31, 2026. Christopher R. Parker, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2026-18600 Filed 9-10-26; 8:45 am]BILLING CODE 4910-13-P