Proposed rule
Airworthiness Directives; CFM International, S.A. Engines
Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register Sept. 14, 2026. Document 2026-18752. Updated Nov. 5, 2026.
- What it does
The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model CFM56-5B, CFM56-5C, and CFM56-7B engines with a certain high-pressure turbine (HPT) inner stationary seal installed. This proposed AD was prompted by multiple reports of honeycomb separation from the surface of HPT inner stationary seals. This proposed AD would require initial and repetitive borescope inspections (BSIs) of the rotating air HPT front seal for cracks and, depending on the results, replacement with a part eligible for installation. This proposed AD would also require removal and replacement of the affected HPT inner stationary seal. This proposed AD would also require inspection of the affected HPT inner stationary seal for honeycomb separation and, depending on the results of the inspection, removal and replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. The FAA is proposing this AD to address the unsafe condition on these products.
The Federal Aviation Administration's summary, as published in the Federal Register.
- What it would change
1 part of Title 14 of the Code of Federal Regulations:
- Before this
991 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bombardier, Inc., Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.) Airplanes
- Sept. 11, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
Since then:
- Sept. 15, 2026 Final rule. Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
- Sept. 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Defence and Space GmbH Airplanes
- Sept. 15, 2026 Final rule. Airworthiness Directives; MD Helicopters, LLC Helicopters
- Sept. 16, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
- Sept. 17, 2026 Final rule. Airworthiness Directives; Bell Textron Canada Limited Helicopters
- Sept. 17, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Sept. 17, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Sept. 17, 2026 Final rule. Airworthiness Directives; Airbus SAS Airplanes
- Sept. 17, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
- Sept. 17, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 17, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Pratt & Whitney Engines
- Sept. 18, 2026 Final rule; request for comments. Airworthiness Directives; Rolls-Royce Deutschland Ltd. & Co. KG Engines
- Sept. 18, 2026 Final rule; request for comments. Airworthiness Directives; Rolls-Royce Deutschland Ltd. & Co. KG Engines
- Sept. 21, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; The Boeing Company Airplanes
- Sept. 22, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Leonardo S.p.a. Helicopters
- Sept. 22, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bell Textron Canada Limited Helicopters
- Sept. 22, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 22, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 23, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Textron Aviation, Inc. (Type Certificate Previously Held by Cessna Aircraft Company) Airplanes
- Sept. 24, 2026 Supplemental notice of proposed rulemaking (SNPRM). Airworthiness Directives; Bombardier, Inc., Airplanes
- Sept. 28, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Sept. 28, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Sept. 28, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Sept. 28, 2026 Final rule; request for comments. Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Sept. 28, 2026 Final rule. Airworthiness Directives; Airbus Helicopters
- Sept. 28, 2026 Final rule; request for comments. Airworthiness Directives; Costruzioni Aeronautiche Tecnam S.P.A. Airplanes
- Sept. 28, 2026 Final rule. Airworthiness Directives; Hélicoptères Guimbal Helicopters
- Sept. 28, 2026 Final rule. Airworthiness Directives; Safran Helicopter Engines, S.A. Engines
- Sept. 29, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Sept. 29, 2026 Final rule; correction. Airworthiness Directives; MD Helicopters, LLC Helicopters
- Sept. 29, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Leonardo S.p.a. Helicopters
- Sept. 29, 2026 Final rule; request for comments. Airworthiness Directives; The Boeing Company Airplanes
- Sept. 30, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 30, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bell Textron Canada Limited Helicopters
- Sept. 30, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Sept. 30, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Vulcanair S.p.A. Airplanes
- Sept. 30, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Oct. 1, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Embraer S.A. Airplanes
- Oct. 1, 2026 Final rule. Airworthiness Directives; Airbus Helicopters
- Oct. 1, 2026 Final rule; request for comments. Airworthiness Directives; Leonardo S.p.a. Helicopters
- Oct. 1, 2026 Final rule. Airworthiness Directives; Airbus Helicopters
- Oct. 1, 2026 Final rule. Airworthiness Directives; Airbus SAS Airplanes
- Oct. 1, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 5, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; DG Aviation GmbH (Type Certificate Previously Held by DG Flugzeugbau GmbH) Gliders
- Oct. 5, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Oct. 7, 2026 Supplemental notice of proposed rulemaking (SNPRM). Airworthiness Directives; Airbus SAS Airplanes
- Oct. 8, 2026 Final rule; request for comments. Airworthiness Directives; Engine Alliance Engines
- Oct. 8, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Various Helicopters
- Oct. 8, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 8, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Oct. 8, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Oct. 9, 2026 Final rule; request for comments. Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Oct. 13, 2026 Final rule; request for comments. Airworthiness Directives; Elixir Aircraft
- Oct. 13, 2026 Final rule. Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
- Oct. 13, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Oct. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Leonardo S.p.A. Helicopters
- Oct. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Baykar Piaggio Aerospace S.p.A. (Type Certificate Previously Held by Piaggio Aviation S.p.A.) Airplanes
- Oct. 14, 2026 Proposed rule; withdrawal. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 14, 2026 Final rule. Airworthiness Directives; Bombardier, Inc., Airplanes
- Oct. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Leonardo S.p.a. Helicopters
- Oct. 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Oct. 15, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Oct. 19, 2026 Final rule. Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
- Oct. 19, 2026 Final rule. Airworthiness Directives; Pratt & Whitney Division Engines
- Oct. 19, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines
- Oct. 19, 2026 Final rule. Airworthiness Directives; Airbus SAS Airplanes
- Oct. 19, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 19, 2026 Final rule. Airworthiness Directives; Airbus SAS Airplanes
- Oct. 19, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 19, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 19, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Oct. 19, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Oct. 22, 2026 Final rule. Airworthiness Directives; General Electric Company Engines
- Oct. 23, 2026 Final rule. Airworthiness Directives; MD Helicopters, LLC Helicopters
- Oct. 23, 2026 Final rule; correction. Airworthiness Directives; The Boeing Company Airplanes; Correction
- Oct. 27, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; CFM International, S.A. Engines
- Oct. 27, 2026 Final rule; request for comments. Airworthiness Directives; Airbus Helicopters
- Oct. 27, 2026 Final rule. Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Oct. 27, 2026 Final rule; request for comments. Airworthiness Directives; Airbus Helicopters
- Oct. 27, 2026 Final rule. Airworthiness Directives; Airbus SAS Airplanes
- Oct. 27, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 27, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 27, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Oct. 27, 2026 Final rule. Airworthiness Directives; Ontic Engineering and Manufacturing, Inc. (Type Certificate Previously Held by Swearingen, Fairchild Aircraft, and M7 Aerospace) Airplanes
- Oct. 28, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Nov. 2, 2026 Final rule; request for comments. Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-Powertrain GMBH & CO KG and Bombardier-Rotax GmbH) Engines
- Nov. 2, 2026 Final rule. Airworthiness Directives; Diamond Aircraft Industries Inc. Airplanes
- Nov. 2, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Nov. 2, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- Nov. 3, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; MD Helicopters, LLC Helicopters
- Nov. 3, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Embraer S.A. (Type Certificate Previously Held by Yaborã Indústria Aeronáutica S.A.; Embraer S.A.) Airplanes
- Nov. 3, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; The Boeing Company Airplanes
- Nov. 3, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Nov. 4, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Pilatus Aircraft Ltd
- Nov. 5, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Costruzioni Aeronautiche Tecnam S.P.A. Airplanes
- Nov. 5, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Nov. 6, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Dassault Aviation Airplanes
- Nov. 6, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Nov. 9, 2026 Final rule. Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
- Nov. 9, 2026 Final rule. Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
- Nov. 9, 2026 Final rule. Airworthiness Directives; Airbus Helicopters
- Nov. 9, 2026 Final rule; request for comments. Airworthiness Directives; Lycoming Engines
- Nov. 9, 2026 Final rule. Airworthiness Directives; The Boeing Company Airplanes
- What happens next and when
The FAA must receive comments on this proposed AD by October 29, 2026.
The agency's dates, word for word.
The record as published
| Document number | 2026-18752 |
|---|---|
| Action | Notice of proposed rulemaking (NPRM). |
| Agencies | Transportation Department; Federal Aviation Administration |
| Published | Sept. 14, 2026 |
| Comments close | Oct. 29, 2026 |
| Regulation identifier (RIN) | 2120-AA64 |
| Docket | FAA-2026-8803 |
Source: the Federal Register (public domain). The document in the Federal Register