# Airworthiness Directives; Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 Series Turboprop Engines
> **Rule** · Final rule; request for comments. · Published 1999-02-04 · Effective 1999-02-19 · 64 FR 5592
## Document
- **Document number:** 99-2494
- **Category:** airworthiness
- **Manufacturer:** Allison
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 5592
- **Publication date:** 1999-02-04
- **Effective date:** 1999-02-19
- **FAA docket:** Docket No. 98-ANE-83-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to Allison Engine Company, Inc. AE 2100A, AE 2100C, and AE 2100D3 series turboprop engines. This action requires removing from service affected turbine wheels prior to exceeding new, reduced cyclic life limits. This amendment is prompted by the results of a refined life analysis. The actions specified in this AD are intended to prevent an uncontained turbine wheel failure, which could result in damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/02/04/99-2494/airworthiness-directives-allison-engine-company-inc-ae-2100a-ae-2100c-and-ae-2100d3-series-turboprop)
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