Final ruleTook effect Oct. 8, 2026
Airworthiness Directives; Pratt & Whitney Division Engines
Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register Sept. 3, 2026. Document 2026-18019. Updated Nov. 6, 2026.
- What it does
The FAA is adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) Model PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 engines. This AD was prompted by the discovery of a quality escape involving incorrect shot peening on certain high- pressure compressor (HPC) drum rotor disk assemblies. This AD requires visually inspecting the HPC drum rotor disk assembly for incorrect shot peen coverage and, depending on the results of the inspection, replacing the HPC drum rotor disk assembly with a part eligible for installation. This AD also requires removing and replacing certain HPC drum rotor disk assemblies before reaching certain life limits. The FAA is issuing this AD to address the unsafe condition on these products.
The Federal Aviation Administration's summary, as published in the Federal Register.
- What changed in the regulation
1 part of Title 14 of the Code of Federal Regulations:
Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).
- Compared with
The Federal Aviation Administration has published 482 final rules in 2026 so far, compared with 518 in all of 2025.
Counted by the Tribune from Federal Register records since Jan. 1, 2025.
- Before this
975 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.
- Sept. 3, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 3, 2026 Final rule; request for comments. Airworthiness Directives; Airbus SAS Airplanes
- Sept. 3, 2026 Final rule; request for comments. Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
- Sept. 3, 2026 Final rule; request for comments. Airworthiness Directives; Airbus SAS Airplanes
- Sept. 2, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
- Sept. 1, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus Helicopters
- Aug. 28, 2026 Final rule. Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
- Aug. 28, 2026 Final rule; request for comments. Airworthiness Directives; Bell Textron Canada Limited Helicopters
Since then:
- Sept. 9, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 9, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 9, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bombardier, Inc. Airplanes
- Sept. 10, 2026 Final rule; correction. Airworthiness Directives; International Aero Engines AG Engines; Correction
- Sept. 10, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bell Textron Canada Limited Helicopters
- Sept. 10, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 10, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bell Textron Canada Limited Helicopters
- Sept. 11, 2026 Final rule. Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Engines
- Sept. 11, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.) Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 11, 2026 Final rule. Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bombardier, Inc., Airplanes
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Dassault Aviation Airplanes
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; CFM International, S.A. Engines
- Sept. 14, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Airbus SAS Airplanes
- 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
This AD is effective October 8, 2026.
The agency's dates, word for word.
The record as published
| Document number | 2026-18019 |
|---|---|
| Action | Final rule. |
| Agencies | Transportation Department; Federal Aviation Administration |
| Published | Sept. 3, 2026 |
| Effective date | Oct. 8, 2026 |
| Regulation identifier (RIN) | 2120-AA64 |
| Docket | FAA-2026-2724 |
Source: the Federal Register (public domain). The document in the Federal Register