# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Formerly Held by Rolls-Royce plc) Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2020-07-20 · Effective 2020-08-04 · 85 FR 43682
## Document
- **Document number:** 2020-15563
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Formerly Held by Rolls-Royce plc) Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 85 FR 43682
- **Publication date:** 2020-07-20
- **Effective date:** 2020-08-04
- **FAA docket:** Docket No. FAA-2020-0617
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG RB211-524G2-19, RB211- 524G2-T-19, RB211-524G3-19, RB211-524G3-T-19, RB211-524H2-19, RB211- 524H2-T-19, RB211-524H-36 and RB211-524H-T-36 model turbofan engines. This AD requires replacement of the low-pressure turbine (LPT) stage 1 disk before it reaches its new Declared Safe Cycle Limit (DSCL) or within 25 flight cycles after the effective date of this AD, whichever occurs later. This AD was prompted by a determination by the manufacturer that the affected LPT stage 1 disks cannot operate until their former published life limit. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/07/20/2020-15563/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-type-certificate-formerly-held-by)
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