# Proposed AD FAA-2026-11811: Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Comments due Dec 3
- Products: Pratt & Whitney RTX PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090 and PW4090-3
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 19, 2026, 91 FR 66012
- Comments due: December 3, 2026
- Docket: FAA-2026-11811 (https://www.regulations.gov/docket/FAA-2026-11811, where comments are filed)
- Project: AD-2026-00667-E
- FR document: 2026-21298
- Official PDF: https://openairdocs.org/files/sha256/25/ea/25ea6d68a39795adf835d5887e8a7908a33ded357f96aced31bfea8c074939d3 (from https://www.govinfo.gov/content/pkg/FR-2026-10-19/pdf/2026-21298.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/10/19/2026-21298/airworthiness-directives-pratt-and-whitney-rtx-corporation-type-certificate-previously-held-by-pratt
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-21298-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-11811

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2026-09-02, which applies to certain Pratt & Whitney RTX Corporation (PW) Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. AD 2026-09-02 requires repetitive angle ultrasonic scan inspections (AUSIs) of the high-pressure compressor (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. Since the FAA issued AD 2026-09-02, the FAA was notified that a certain part number was omitted from AD 2026-09-02 and the applicability of the optional terminating action was matched to an unrelated requirement. This proposed AD would require repetitive AUSIs of the HPC 15th-stage disks, front turbine hubs, 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 proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Oct 19, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-21298, comments due Dec 3, 2026 (https://www.federalregister.gov/documents/2026/10/19/2026-21298/airworthiness-directives-pratt-and-whitney-rtx-corporation-type-certificate-previously-held-by-pratt)

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