# Airworthiness Directives; 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
> **Rule** · Final rule. · Published 2003-11-07 · Effective 2003-12-12 · 68 FR 63013
## Document
- **Document number:** 03-27668
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 68 FR 63013
- **Publication date:** 2003-11-07
- **Effective date:** 2003-12-12
- **FAA docket:** Docket No. 2002-NM-157-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), 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 amendment requires revising the airplane flight manual to provide the flightcrew with procedures and limitations for operating the airplane with out-of-tolerance angle of attack (AOA) transducers. This amendment also requires, 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/11/07/03-27668/airworthiness-directives-bombardier-model-cl-600-1a11-cl-600-cl-600-2a12-cl-601-and-cl-600-2b16)
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