AD 2026-08-04

21950 Federal Register / Vol. 91, No. 79 / Friday, April 24, 2026 / Rules and Regulations F IGURE 2 TO P ARAGRAPH (i)—ALS A DDITIONAL I NSPECTIONS Engine manual Chapter/ section HPT enhanced inspection requirements Section Additional inspection PW2000 .................... 1A6231 05–10–00 Table 807 .................................. Revision Date: 2025–02–01. HPT 1st-stage disk ................... 72–52–02 Immersion Ultrasonic inspect disk. Refer to 72–52–02, Inspection/Check-07 (Task 72–52–02–200–008). Hub—HPT Stage 2 ................... 72–52–16 Immersion Ultrasonic inspect hub. Refer to 72–52–16, Inspection/Check-08 (Task 72–52–16–200–009). F117–PW–100 ......... 1B2412 05–10–00 Table 802 .................................. Revision Date: 2025–02–01. HPT 1st-stage disk ................... 72–52–02 Immersion Ultrasonic inspect disk. Refer to 72–52–02, Inspection/Check-07 (Task 72–52–02–200–007). .............................. Hub—HPT Stage 2 ................... 72–52–16 Immersion Ultrasonic inspect hub. Refer to 72–52–16, Inspection/Check-08 (Task 72–52–16–200–008). (j) Installation Prohibition (1) As of the effective date of this AD, no person may install on any engine, an HPT 1st-stage disk having P/N 1B7801, 1B3601, or 1B3601–001, unless it is a part eligible for installation as defined in paragraph (h)(2) of this AD. (2) As of the effective date of this AD, no person may install on any engine, a turbine hub having P/N 1B4902, 1B6602, or 1B8002, unless it is a part eligible for installation as defined in paragraph (h)(2) of this AD. (3) As of the effective date of this AD, no person may install on any engine, an HPT lenticular seal assembly having a part number and serial number identified in figure 1 to paragraph (g)(4) of this AD. (k) 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 of the AIR–520 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (l) 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. (l) Additional Information For more information about this AD, contact Molly Sturgis, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (562) 627–5373; email: molly.a.sturgis@faa.gov. (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 the AD specifies otherwise. (i) Pratt & Whitney (PW) Alert Service Bulletin (ASB) PW2000 A72–779, Revision No. 1, dated December 17, 2025. (ii) PW ASB PW2000 A72–780, dated May 2, 2024. (iii) PW ASB PWF117 A72–433, dated May 1, 2024. (iv) PW ASB PWF117 A72–434, dated May 1, 2024. (3) For PW material identified in this AD, contact PW, 400 Main Street, East Hartford, CT 06118; phone: (860) 565–0140; email: help24@prattwhitney.com; website: connect.prattwhitney.com. (4) You may view this material at the 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 April 10, 2026. Brian Knaup, Acting Deputy Director, Integrated Certificate Management Division,Aircraft Certification Service. [FR Doc. 2026–08106 Filed 4–23–26; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2026–0727; Project Identifier MCAI–2025–01659–T; Amendment 39–23312; AD 2026–08–04] RIN 2120–AA64 Airworthiness Directives; Bombardier, Inc., Airplanes AGENCY : Federal Aviation Administration (FAA), DOT. ACTION : Final rule. SUMMARY : The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD–700–1A10 and BD–700–1A11 airplanes. This AD was prompted by a determination that the approach speed adders and landing distance factors must be corrected in the airplane flight manual (AFM) tables in the non-normal procedure for the SLAT FAIL (Caution) crew alerting system (CAS) message. This AD requires revising the existing AFM to provide the flightcrew with the correct approach speed adders and landing distance factors for the non-normal procedures for the SLAT FAIL (Caution) CAS message. The FAA is issuing this AD to address the unsafe condition on these products. DATES : This AD is effective May 29, 2026. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of May 29, 2026. ADDRESSES : AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA–2026–0727; 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, the mandatory continuing airworthiness information (MCAI), any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590. Material Incorporated by Reference: • For Transport Canada material identified in this AD, contact Transport Canada, Transport Canada National Aircraft Certification, 159 Cleopatra VerDate Sep<11>2014 17:12 Apr 23, 2026 Jkt 268001 PO 00000 Frm 00014 Fmt 4700 Sfmt 4700 E:\FR\FM\24APR1.SGM 24APR1 KHAMMOND on DSK9W7S144PROD with RULES

21951 Federal Register / Vol. 91, No. 79 / Friday, April 24, 2026 / Rules and Regulations Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888–663–3639; email TC.AirworthinessDirectives- Consignesdenavigabilite.TC@tc.gc.ca. You may find this material on the Transport Canada website at tc.canada.ca/en/aviation. • 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 regulations.gov under Docket No. FAA–2026–0727. FOR FURTHER INFORMATION CONTACT : John Massey, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516–228– 7300; email: 9-avs-nyaco-cos@faa.gov. SUPPLEMENTARY INFORMATION : Background The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to certain Bombardier, Inc., Model BD–700–1A10 and BD–700–1A11 airplanes. The NPRM was published in the Federal Register on January 27, 2026 (91 FR 3397). The NPRM was prompted by AD CF–2025–53, dated November 11, 2025 (Transport Canada AD CF–2025–53) (also referred to as the MCAI), issued by Transport Canada, which is the aviation authority for Canada. The MCAI states that Bombardier has determined that the approach speed adders and landing distance factors in the AFM tables in the non-normal procedure for the SLAT FAIL (Caution) CAS message require correction. If not addressed, the incorrect approach speed adders for the SLAT FAIL (Caution) non-normal procedure could result in a reduced maneuvering margin to stick shaker activation, failing to provide the margins assumed during the airplane’s initial certification. This condition may adversely affect the safe operation of the airplane and increase flightcrew workload due to an unexpected stall warning and stick shaker activation. In the NPRM, the FAA proposed to require revising the existing AFM to provide the flightcrew with the correct approach speed adders and landing distance factors for the non-normal procedures for the SLAT FAIL (Caution) CAS message, as specified in Transport Canada AD CF–2025–53. The FAA is issuing 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–2026–0727. Discussion of Final Airworthiness Directive Comments The FAA received comments from a commenter who supported the NPRM without change. Conclusion These products have been approved by the civil aviation authority of another country and are approved for operation in the United States. Pursuant to the FAA’s bilateral agreement with this State of Design Authority, that authority has notified the FAA of the unsafe condition described in the MCAI referenced above. The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these products. Except for minor editorial changes, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator. Material Incorporated by Reference Under 1 CFR Part 51 Transport Canada AD CF–2025–53 specifies procedures for revising the AFM to correct the approach speed adders and landing distance factors in the AFM tables in the non-normal procedures for the SLAT FAIL (Caution) CAS message. 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. Costs of Compliance The FAA estimates that this AD affects 925 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: E STIMATED C OSTS FOR R EQUIRED A CTIONS Labor cost Parts cost Cost per product Cost on U.S. operators 1 work-hour × $85 per hour = $85 .............................................................................................. $0 $85 $78,625 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 This AD will not have federalism implications under Executive Order 13132. This AD will 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 that this AD: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Will not affect intrastate aviation in Alaska, and (3) Will 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 Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: VerDate Sep<11>2014 17:12 Apr 23, 2026 Jkt 268001 PO 00000 Frm 00015 Fmt 4700 Sfmt 4700 E:\FR\FM\24APR1.SGM 24APR1 KHAMMOND on DSK9W7S144PROD with RULES

21952 Federal Register / Vol. 91, No. 79 / Friday, April 24, 2026 / Rules and Regulations 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 adding the following new airworthiness directive: 2026–08–04 Bombardier, Inc.: Amendment 39–23312; Docket No. FAA–2026–0727; Project Identifier MCAI–2025–01659–T. (a) Effective Date This airworthiness directive (AD) is effective May 29, 2026. (b) Affected ADs None. (c) Applicability This AD applies to certain Bombardier, Inc., Model BD–700–1A10 and BD–700–1A11 airplanes, certificated in any category, as identified in Transport Canada AD CF–2025– 53, dated November 11, 2025 (Transport Canada AD CF–2025–53) except serial number 9001. (d) Subject Air Transport Association (ATA) of America Code 27, Flight Controls. (e) Unsafe Condition This AD was prompted by a determination that the approach speed adders and landing distance factors must be corrected in the airplane flight manual (AFM) tables in the non-normal procedure for the SLAT FAIL (Caution) crew alerting system (CAS) message. The FAA is issuing this AD to correct the approach speed adders and landing distance factors for the SLAT FAIL (Caution) non-normal procedure. The unsafe condition, if not corrected, could lead to a reduced maneuvering margin to stick shaker (stall warning) activation, which could increase flightcrew workload due to an unexpected stall warning and could adversely affect the safe operation of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Requirements Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, Transport Canada AD CF– 2025–53. (h) Exceptions to Transport Canada AD CF– 2025–53 (1) Where Transport Canada AD CF–2025– 53 refers to its effective date, this AD requires using the effective date of this AD. (2) Where paragraph B of Transport Canada AD CF–2025–53 specifies to ‘‘Advise all flight crews of the changes introduced by the approved Transport Canada AFM procedures listed above and thereafter operate the aeroplane accordingly,’’ this AD does not require those actions as those actions are already required by existing FAA operating regulations (see 14 CFR 91.9, 91.505, and 121.137). (i) 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 (j) of this AD and email to: AMOC@faa.gov . 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 Transport Canada; or Bombardier, Inc.’s Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. (j) Additional Information For more information about this AD, contact John Massey, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516–228– 7300; email: 9-avs-nyaco-cos@faa.gov. (k) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference 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. (i) Transport Canada AD CF–2025–53, dated November 11, 2025. (ii) [Reserved] (3) For Transport Canada material identified in this AD, contact Transport Canada, Transport Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888– 663–3639; email TC.AirworthinessDirectives- Consignesdenavigabilite.TC@tc.gc.ca. You may find this material on the Transport Canada website at tc.canada.ca/en/aviation. (4) 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. (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 April 13, 2026. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2026–08032 Filed 4–23–26; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2026–3862; Project Identifier MCAI–2026–00317–A; Amendment 39–23319; 2026–08–11] RIN 2120–AA64 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes AGENCY : Federal Aviation Administration (FAA), DOT. ACTION : Final rule; request for comments. SUMMARY : The FAA is adopting a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Model PC– 12/47G airplanes. This AD was prompted by a report that a brake shuttle valve (BSV) on a production airplane shuttled and isolated the brake line to the left-hand (LH) brake, which resulted in brake lockup. This AD requires replacement of the LH and right-hand (RH) brake pipe assemblies and also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products. DATES : This AD is effective May 11, 2026. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of May 11, 2026. The FAA must receive comments on this AD by June 8, 2026. 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 VerDate Sep<11>2014 17:12 Apr 23, 2026 Jkt 268001 PO 00000 Frm 00016 Fmt 4700 Sfmt 4700 E:\FR\FM\24APR1.SGM 24APR1 KHAMMOND on DSK9W7S144PROD with RULES