Data / Federal rules / 2026-21298
Airworthiness Directives; Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines
The Federal Aviation Administration published this proposed rule in the Federal Register on October 19, 2026. Comments are due by December 3, 2026.
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What the agency says
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.
Key facts
- Document number
- 2026-21298
- Type
- Proposed rule
- Action
- Notice of proposed rulemaking (NPRM)
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- October 19, 2026
- Comments due
- December 3, 2026
- Dates
- The FAA must receive comments on this proposed AD by December 3, 2026.
- Docket
- Docket No. FAA-2026-11811; Project Identifier AD-2026-00667-E
- Regulation ID (RIN)
- 2120-AA64
- Code of Federal Regulations
- 14 CFR 39
- Topics
- Air transportation; Aircraft; Aviation safety; Incorporation by reference; Safety
- Pages
- 5
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Everything from the Federal Aviation Administration · Rules on air transportation · Rules on aircraft · Rules on aviation safety · Published in October 2026
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