# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co Engines
> **Rule** · Final rule. · Published 2023-11-20 · Effective 2023-12-26 · 88 FR 80582
## Document
- **Document number:** 2023-25517
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Deutschland Ltd & Co
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 88 FR 80582
- **Publication date:** 2023-11-20
- **Effective date:** 2023-12-26
- **FAA docket:** Docket No. FAA-2023-1399
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2020-15-07 for certain Rolls-Royce Deutschland Ltd & Co KG (RRD) (type certificate previously held by Rolls-Royce plc) Model 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 engines. AD 2020-15-07 required replacement of the low-pressure turbine (LPT) stage 1 disk with part number (P/N) UL37606, UL37607, UL37608, UL37722, or UL37790, installed. This AD was prompted by an updated analysis by the engine manufacturer, which indicates certain part-numbered and serial-numbered LPT stage 1 disks that have undergone rework could fail before the current published life limits. This AD retains the requirement to replace the LPT stage 1 disk and includes additional LPT stage 1 disks, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/11/20/2023-25517/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-engines)
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