# Proposed AD FAA-2008-0426: MORAVAN a.s. Model Z-143L Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Moravan
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 11, 2008, 73 FR 19766
- Comments due: May 12, 2008
- Docket: FAA-2008-0426 (https://www.regulations.gov/docket/FAA-2008-0426, where comments are filed)
- Project: 2008-CE-016-AD
- FR document: E8-7654
- Official PDF: https://openairdocs.org/files/sha256/d4/37/d437d415659686fedb21f6e99f0ce5164a98a004d15cd2e6910d4bce59e14838 (from https://www.govinfo.gov/content/pkg/FR-2008-04-11/pdf/E8-7654.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/04/11/E8-7654/airworthiness-directives-moravan-as-model-z-143l-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3755941BCDB4B29D86257428004C99D2.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0426

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

Vortex inserts are used inside the heat exchanger of the carburettor heating system. Up to serial number (s/n) 0044 inclusive those inserts have been produced from aluminium alloy which has been found to be susceptible of cracks. As a consequence, if left uncorrected some loose parts could migrate in the induction system, reduce the air flow through the carburettor's venturi and lead to a loss of engine power.

From s/n 0045 onwards vortex inserts have been produced from stainless steel.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Apr 11, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-7654, comments due May 12, 2008 (https://www.federalregister.gov/documents/2008/04/11/E8-7654/airworthiness-directives-moravan-as-model-z-143l-airplanes)

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