# Proposed AD 2000-NM-311-AD: Bombardier Model CL-600-2B19 (Regional Jet Series 100) Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-11-20
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 13, 2003, 68 FR 1566
- Comments due: February 12, 2003
- Became: [AD 2003-11-20](https://openairdocs.org/ad/2003-11-20)
- Docket: 2000-NM-311-AD
- FR document: 03-642
- Official PDF: https://openairdocs.org/files/sha256/73/05/73051de13b6bf6331f5ef8a574e0b29f3597d87fda29646df4722115d35e72f6 (from https://www.govinfo.gov/content/pkg/FR-2003-01-13/pdf/03-642.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/01/13/03-642/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2C1EBC73860A984086256CAD005FEF3C.0001
- Page: https://openairdocs.org/proposed/2000-NM-311-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Bombardier Model CL-600-2B19 (Regional Jet series 100) series airplanes, that currently requires repetitive lubrication with grease of the sliding shaft of the input plunger of the brake control valve assembly. This action would add requirements for modifying the brake control valve assembly, and subsequent repetitive lubrications of the valve. Accomplishment of the modification would terminate the repetitive lubrications of the sliding shaft of the input plunger required by the existing AD. This proposal is prompted by reports of temporary loss of braking action upon landing. The actions specified by the proposed AD are intended to prevent temporary loss of braking action due to the freezing of moisture of the input plunger of the brake control valve during steep descent.

## Notices in this docket

- Jan 13, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-642, comments due Feb 12, 2003 (https://www.federalregister.gov/documents/2003/01/13/03-642/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-series-airplanes)

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