# Airworthiness Directives; Engine Components Incorporated (ECi) Reciprocating Engine Cylinders
> **Rule** · Final rule; request for comments. · Published 2004-04-20 · Effective 2004-05-05 · 69 FR 21049
## Document
- **Document number:** 04-8877
- **Category:** airworthiness
- **Manufacturer:** Engine Components Incorporated (ECi) Reciprocating
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 69 FR 21049
- **Publication date:** 2004-04-20
- **Effective date:** 2004-05-05
- **FAA docket:** Docket No. 2004-NE-07-AD
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Teledyne Continental Motors (TCM) models 520 and 550 series engines with certain ECi cylinders installed. This AD requires replacing certain serial-numbered (SN) cylinders supplied by ECi before further flight. This AD results from reports of 34 failures of cylinder heads marketed by ECi. We are issuing this AD to prevent loss of engine power due to cracks in the cylinder head and possible engine failure caused by separation of a cylinder head.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/04/20/04-8877/airworthiness-directives-engine-components-incorporated-eci-reciprocating-engine-cylinders)
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