# Proposed AD 2002-NM-157-AD: Bombardier Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604) Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-22-12
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 28, 2003, 68 FR 9602
- Comments due: March 31, 2003
- Became: [AD 2003-22-12](https://openairdocs.org/ad/2003-22-12)
- Docket: 2002-NM-157-AD
- FR document: 03-4739
- Official PDF: https://openairdocs.org/files/sha256/04/67/0467b62d035fe7b5d1b24cac1dad7e22ca1dce1dfd723efd8788105424d084d8 (from https://www.govinfo.gov/content/pkg/FR-2003-02-28/pdf/03-4739.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/02/28/03-4739/airworthiness-directives-bombardier-model-cl-600-1a11-cl-600-cl-600-2a12-cl-601-and-cl-600-2b16
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EC99C77E495B141686256CDB005D1030.0001
- Page: https://openairdocs.org/proposed/2002-NM-157-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Bombardier Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604) series airplanes. This proposal would require revising the Airplane Flight Manual (AFM) to provide the flightcrew with procedures and limitations for operating the airplane with out-of-tolerance angle of attack (AOA) transducers. This proposal also would require, among other actions, measuring the vane angles and voltage of the AOA transducers; reworking the AOA transducer assemblies; repetitive measurements of the resistance of both AOA transducers; and follow-on and corrective actions, as applicable. This action is necessary to prevent flat spots on the potentiometers of the AOA transducers due to wear, which may cause a delay in the commands for stall warning, stick shaker, and stick pusher operation. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Feb 28, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-4739, comments due Mar 31, 2003 (https://www.federalregister.gov/documents/2003/02/28/03-4739/airworthiness-directives-bombardier-model-cl-600-1a11-cl-600-cl-600-2a12-cl-601-and-cl-600-2b16)

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