# Proposed AD 99-NM-261-AD: Construcciones Aeronauticas, S.A. (CASA) Model CN-235-100 and CN-235-200 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-05-05
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 5, 2000, 65 FR 399
- Comments due: February 4, 2000
- Became: [AD 2000-05-05](https://openairdocs.org/ad/2000-05-05)
- Docket: 99-NM-261-AD
- FR document: 00-136
- Official PDF: https://openairdocs.org/files/sha256/8d/9b/8d9b139c31d0f202d16f0c525786f768f5fc2e1dd27f85d24c4116a8c303c313 (from https://www.govinfo.gov/content/pkg/FR-2000-01-05/pdf/00-136.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/01/05/00-136/airworthiness-directives-construcciones-aeronauticas-sa-casa-model-cn-235-100-and-cn-235-200-series
- Page: https://openairdocs.org/proposed/99-NM-261-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all CASA Model CN-235-100 and CN- 235-200 series airplanes. This proposal would require replacement of existing anti-icing distributor valves with new, improved valves. 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 ice accumulation on the wings or tail of the airplane, which could result in reduced controllability of the airplane.

## Notices in this docket

- Jan 5, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-136, comments due Feb 4, 2000 (https://www.federalregister.gov/documents/2000/01/05/00-136/airworthiness-directives-construcciones-aeronauticas-sa-casa-model-cn-235-100-and-cn-235-200-series)

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