# Proposed AD 99-CE-71-AD: MORAVAN a.s. Models Z-143L and Z-242L Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2002-22-01
- Products: Moravan
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 14, 2002, 67 FR 52899
- Comments due: September 20, 2002
- Became: [AD 2002-22-01](https://openairdocs.org/ad/2002-22-01)
- Docket: 99-CE-71-AD
- FR document: 02-20516
- Official PDF: https://openairdocs.org/files/sha256/8d/c2/8dc2af6fa537d9ae5c27ae936838c59f92f8964a1e3a1790c29e362b127683a9 (from https://www.govinfo.gov/content/pkg/FR-2002-08-14/pdf/02-20516.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/08/14/02-20516/airworthiness-directives-moravan-as-models-z-143l-and-z-242l-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BA80C5B795E7D30286256C150066C212.0001
- Page: https://openairdocs.org/proposed/99-CE-71-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain MORAVAN a.s. (Moravan) Models Z-143L and Z-242L airplanes. This proposed AD would require you to modify the engine secondary vent line. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the Czech Republic. The actions specified by this proposed AD are intended to prevent the engine crankcase ventilation lines from freezing during flight in cold weather (winter) conditions, which could result in oil leaking from the engine. Such a condition could lead to engine failure.

## Notices in this docket

- Aug 14, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-20516, comments due Sep 20, 2002 (https://www.federalregister.gov/documents/2002/08/14/02-20516/airworthiness-directives-moravan-as-models-z-143l-and-z-242l-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.