# Proposed AD FAA-2010-0438: Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) Airplanes, Model CL-600-2D15 (Regional Jet Series 705) Airplanes, and Model CL-600-2D24 (Regional Jet Series 900) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-20-15
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 10, 2010, 75 FR 25791
- Comments due: June 24, 2010
- Became: [AD 2010-20-15](https://openairdocs.org/ad/2010-20-15)
- Docket: FAA-2010-0438 (https://www.regulations.gov/docket/FAA-2010-0438, where comments are filed)
- Project: 2009-NM-265-AD
- FR document: 2010-10887
- Official PDF: https://openairdocs.org/files/sha256/e9/97/e9974eb1d2cefc5bd8cd24c38ff6e633d84e8f487a9a37aa49ccccc2b20f91d0 (from https://www.govinfo.gov/content/pkg/FR-2010-05-10/pdf/2010-10887.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/05/10/2010-10887/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8B443A259A1A17968625771F004C534C.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0438

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

The heating capability of several [angle of attack] AOA transducer heating elements removed from in-service aircraft has been found to be below the minimum requirement. Also, it was discovered that a large number of AOA transducers repaired in an approved maintenance facility were not calibrated accurately. Inaccurate calibration of the AOA transducer and/or degraded AOA transducer heating elements can result in early or late activation of the stall warning, stick shaker and stick pusher by the Stall Protection Computer (SPC).

Inaccurate calibration of the AOA transducers and/or degraded AOA transducer heating elements could result in an ineffective response to an aerodynamic stall and reduced controllability of the airplane. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- May 10, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-10887, comments due Jun 24, 2010 (https://www.federalregister.gov/documents/2010/05/10/2010-10887/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702)

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