# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce Deutschland GmbH, Formerly BMW Rolls-Royce GmbH) Turbofan Engines
> **Rule** · Final rule. · Published 2021-07-08 · Effective 2021-08-12 · 86 FR 36064
## Document
- **Document number:** 2021-14481
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 36064
- **Publication date:** 2021-07-08
- **Effective date:** 2021-08-12
- **FAA docket:** Docket No. FAA-2020-1174
## Abstract

The FAA is adopting 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 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 AD requires 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 issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/07/08/2021-14481/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-type-certificate-previously-held-by)
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