# Proposed AD FAA-2020-1174: Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce Deutschland GmbH, Formerly BMW Rolls-Royce GmbH) Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-12-07
- Products: Rolls-Royce Deutschland
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 21, 2021, 86 FR 6271
- Comments due: March 8, 2021
- Became: [AD 2021-12-07](https://openairdocs.org/ad/2021-12-07)
- Docket: FAA-2020-1174 (https://www.regulations.gov/docket/FAA-2020-1174, where comments are filed)
- Project: MCAI-2019-00135-E
- FR document: 2021-00672
- Official PDF: https://openairdocs.org/files/sha256/40/bb/40bba5030d15eaa9510c7d07f3c3906d6ad91894cd408cfafb2f356ed91ec312 (from https://www.govinfo.gov/content/pkg/FR-2021-01-21/pdf/2021-00672.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/01/21/2021-00672/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-type-certificate-previously-held-by
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/57AB69FC19DD6EFD8625866300646C4F.0001
- Page: https://openairdocs.org/proposed/FAA-2020-1174

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG (RRD) BR700-710A1-10, BR700-710A2-20 and BR700-710C4-11 model turbofan engines. This proposed AD was prompted by an investigation by RRD, which revealed a quality escape during the high-pressure turbine (HPT) stage 1 disk rim cooling air hole manufacturing process. This proposed AD would require removing affected HPT disks from service prior to reaching specified compliance times or at the next engine shop visit, whichever occurs first. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 21, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-00672, comments due Mar 8, 2021 (https://www.federalregister.gov/documents/2021/01/21/2021-00672/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-type-certificate-previously-held-by)

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