Airworthiness Directives; Pratt & Whitney Engines

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register April 24, 2026. Document 2026-08106. Updated Nov. 12, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for certain Pratt & Whitney (PW) Model F117-PW-100, PW2037, PW2037D, PW2037M, PW2040, and PW2040D engines. This AD was prompted by an updated analysis of an event involving an International Aero Engines, LLC (IAE LLC) Model PW1127GA-JM engine, which experienced a high- pressure compressor (HPC) 7th-stage integrally bladed rotor (IBR-7) separation that resulted in an engine shutdown and aborted takeoff. This AD requires repetitive angled ultrasonic inspections (AUSIs) of certain high-pressure turbine (HPT) 1st-stage disks and turbine hubs for any crack indications, and if necessary, removal from service and replacement, and removal from service of certain HPT lenticular seal assemblies. 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:

14 CFR 39

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 485 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

757 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

April 24, 2026 Final rule. Airworthiness Directives; Bombardier, Inc., Airplanes
April 24, 2026 Final rule. Airworthiness Directives; Dassault Aviation Airplanes
April 24, 2026 Final rule; request for comments. Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
April 24, 2026 Final rule; request for comments. Airworthiness Directives; B/E Aerospace Fischer GmbH Medical Seats
April 23, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Various Helicopters
April 23, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bell Textron Canada Limited Helicopters
April 23, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; The Boeing Company Airplanes
April 23, 2026 Notice of proposed rulemaking (NPRM). Airworthiness Directives; Bombardier, Inc., Airplanes

Since then:

What happens next and when

This AD is effective May 29, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-08106
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	April 24, 2026
Effective date	May 29, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2025-0918

Source: the Federal Register (public domain). The document in the Federal Register