# Airworthiness Directives; Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F Series Reciprocating Engines
> **Rule** · Final rule; request for comments. · Published 2002-08-16 · Effective 2002-09-03 · 67 FR 53473
## Document
- **Document number:** 02-20266
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 67 FR 53473
- **Publication date:** 2002-08-16
- **Effective date:** 2002-09-03
- **FAA docket:** Docket No. 2002-NE-17-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain serial numbers (SN's) of Bombardier-Rotax GmbH type 912 F, 912 S and 914 F series reciprocating engines. This action requires replacement of the valve spring retainers, part number (P/N) 854.182, with the new-reinforced valve spring retainers, P/N 854.184. This amendment is prompted by reports of several cracked valve spring retainers discovered in-service. The actions specified in this AD are intended to prevent cracking of the valve spring retainers resulting in possible engine failure while in-flight.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2002/08/16/02-20266/airworthiness-directives-bombardier-rotax-gmbh-type-912-f-912-s-and-914-f-series-reciprocating)
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