# Airworthiness Directives; Liberty Aerospace Incorporated Model XL-2 Airplanes
> **Rule** · Final rule; request for comments. · Published 2009-04-09 · Effective 2009-04-20 · 74 FR 16117
## Document
- **Document number:** E9-8075
- **Category:** airworthiness
- **Manufacturer:** Liberty Aerospace Incorporated Model XL-2
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 74 FR 16117
- **Publication date:** 2009-04-09
- **Effective date:** 2009-04-20
- **FAA docket:** Docket No. FAA-2009-0329
## Abstract

We are adopting a new airworthiness directive (AD) for certain Liberty Aerospace Incorporated Model XL-2 airplanes. This AD requires you to repetitively inspect the exhaust muffler for cracks and to replace the exhaust muffler when cracks are found. This AD is the result of reports that cracks have been found in the exhaust muffler during maintenance and service inspections. We are issuing this AD to detect and correct cracks in the exhaust muffler, which could result in carbon monoxide entering the cabin through the heating system. Carbon monoxide entering into the airplane cabin could lead to incapacitation of the pilot.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/04/09/E9-8075/airworthiness-directives-liberty-aerospace-incorporated-model-xl-2-airplanes)
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