# Proposed AD FAA-2026-8781: Rolls-Royce Deutschland Ltd & Co KG Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Rolls-Royce Deutschland Trent XWB-75, Trent XWB-79, Trent XWB-79B and Trent XWB-84
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 17, 2026, 91 FR 53200
- Comments due: October 1, 2026
- Docket: FAA-2026-8781 (https://www.regulations.gov/docket/FAA-2026-8781, where comments are filed)
- Project: MCAI-2024-00182-E
- FR document: 2026-16705
- Official PDF: https://openairdocs.org/files/sha256/a2/6b/a26bd6cae88b193eed02436d3b6a5d7f2d383c95f0367678a1006b4d656ebbab (from https://www.govinfo.gov/content/pkg/FR-2026-08-17/pdf/2026-16705.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/08/17/2026-16705/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-16705-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-8781

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Rolls-Royce Deutschland Ltd & Co KG (RRD) Model Trent XWB-75, XWB-79, XWB-79B, and XWB-84 engines. This proposed AD was prompted by reports of differential oil pressure measurements that were lower than expected on in-service engines. This proposed AD would require modification of the engine with an improved front bearing housing oil feed tube assembly. This proposed AD would also prohibit the installation of an affected front bearing housing oil feed tube assembly on any engine. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 17, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-16705, comments due Oct 1, 2026 (https://www.federalregister.gov/documents/2026/08/17/2026-16705/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-engines)

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