# Proposed AD 99-NM-34-AD: Bombardier Model CL-600-2B19 (Regional Jet Series 100) Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-02-34
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 14, 1999, 64 FR 37913
- Comments due: August 13, 1999
- Became: [AD 2000-02-34](https://openairdocs.org/ad/2000-02-34)
- Docket: 99-NM-34-AD
- FR document: 99-17862
- Official PDF: https://openairdocs.org/files/sha256/85/79/85792bc291d39de07815eff7d3051aa48e510a52252b2f73d9dceb1f6f9be5cb (from https://www.govinfo.gov/content/pkg/FR-1999-07-14/pdf/99-17862.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/07/14/99-17862/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-34-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Bombardier Model CL-600-2B19 (Regional Jet Series 100) series airplanes. This proposal would require revising the Airplane Flight Manual to provide the flightcrew with modified procedures and limitations for operating in icing conditions. This proposal is prompted by an accident report indicating that possible accretion of ice on the wings of the airplane, due to the wing anti-ice system not being activated by the flightcrew, could have contributed to the source of the accident. The actions specified by the proposed AD are intended to prevent undetected accretion of ice on the wings, which could result in reduced controllability of the airplane during normal icing conditions.

## Notices in this docket

- Jul 14, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-17862, comments due Aug 13, 1999 (https://www.federalregister.gov/documents/1999/07/14/99-17862/airworthiness-directives-bombardier-model-cl-600-2b19-regional-jet-series-100-series-airplanes)

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