# Airworthiness Directives; Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines
> **Rule** · Final rule. · Published 2026-05-22 · Effective 2026-06-26 · 91 FR 30191
## Document
- **Document number:** 2026-10360
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation)
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 30191
- **Publication date:** 2026-05-22
- **Effective date:** 2026-06-26
- **FAA docket:** Docket No. FAA-2025-0923
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Pratt & Whitney RTX Corporation (PW) Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. This AD was prompted by an 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 aborted takeoff. This AD requires repetitive angle ultrasonic scan inspections (AUSIs) of the HPC 15th- stage disks, front turbine hubs, high pressure turbine (HPT) 1st-stage air seals, and HPT 2nd-stage hubs for crack indications, and removal from service and replacement if necessary, and for certain serial numbers, removal from service and replacement of the HPT 1st-stage air seal. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/05/22/2026-10360/airworthiness-directives-pratt-and-whitney-rtx-corporation-type-certificate-previously-held-by-pratt)
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