# Airworthiness Directives; Rolls-Royce Corporation (Type Certificate Previously Held by Allison Engine Company) Turboprop Engines
> **Rule** · Final rule; request for comments. · Published 2020-09-29 · Effective 2020-10-14 · 85 FR 60891
## Document
- **Document number:** 2020-21377
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Corporation (Type Certificate Previously Held by Allison
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 85 FR 60891
- **Publication date:** 2020-09-29
- **Effective date:** 2020-10-14
- **FAA docket:** Docket No. FAA-2020-0853
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Rolls-Royce Corporation (RRC) AE 2100D3 model turboprop engines. This AD requires revising the airworthiness limitations section (ALS) of the RRC AE 2100D3 Maintenance Manual and the operator's approved continuous airworthiness maintenance program. This AD was prompted by a report of a propeller gearbox (PGB) development test in which high vibration occurred due to a fatigue crack that initiated in the propeller shaft. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/09/29/2020-21377/airworthiness-directives-rolls-royce-corporation-type-certificate-previously-held-by-allison-engine)
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