# Proposed AD 99-NM-356-AD: Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-20-05
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 17, 2000, 65 FR 20388
- Comments due: May 17, 2000
- Became: [AD 2000-20-05](https://openairdocs.org/ad/2000-20-05)
- Docket: 99-NM-356-AD
- FR document: 00-9556
- Official PDF: https://openairdocs.org/files/sha256/b6/1a/b61ace575ed0598005c2611e2fd3a84dc3beaac971caa4e43a09736b5af9145f (from https://www.govinfo.gov/content/pkg/FR-2000-04-17/pdf/00-9556.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/04/17/00-9556/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-120-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-356-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain EMBRAER Model EMB-120 series airplanes. This proposal would require revising the Airplane Flight Manual (AFM), and either installing hydraulic tube assemblies incorporating a check valve, or visually inspecting the check valve if already installed and corrective action, if necessary. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent the landing gear doors from becoming blocked from opening during application of emergency procedures in the event of a loss of hydraulics.

## Notices in this docket

- Apr 17, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-9556, comments due May 17, 2000 (https://www.federalregister.gov/documents/2000/04/17/00-9556/airworthiness-directives-empresa-brasileira-de-aeronautica-sa-embraer-model-emb-120-series-airplanes)

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