# Proposed AD FAA-2010-1109: 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 2011-03-13
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 10, 2010, 75 FR 69030
- Comments due: December 27, 2010
- Became: [AD 2011-03-13](https://openairdocs.org/ad/2011-03-13)
- Docket: FAA-2010-1109 (https://www.regulations.gov/docket/FAA-2010-1109, where comments are filed)
- Project: 2010-NM-155-AD
- FR document: 2010-28338
- Official PDF: https://openairdocs.org/files/sha256/bf/1f/bf1f87483ac1adfdfdd9c36f7c21a26324fe5a335e839ecadb726168f7efee0d (from https://www.govinfo.gov/content/pkg/FR-2010-11-10/pdf/2010-28338.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/11/10/2010-28338/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3D1530EE3C1CDE81862577D700481AA2.0001
- Page: https://openairdocs.org/proposed/FAA-2010-1109

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. 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:

Rudder Travel Limiter (RTL) return spring, part number (P/N) E0650- 069-2750S, failed prior to completion of the required endurance test. In addition, the replacement RTL return spring, P/N 670-93465- 1 * * * was found to be susceptible to chafing on the primary actuator, which could also result in eventual dormant spring failure. There are two return springs in the RTL and if both springs failed, a subsequent mechanical disconnect of the RTL components would result in an unannunciated failure of the RTL. This, in turn, would permit an increase of rudder authority beyond normal structural limits and, in the event of a strong rudder input, controllability of the aeroplane could be affected. * * * * * The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Nov 10, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-28338, comments due Dec 27, 2010 (https://www.federalregister.gov/documents/2010/11/10/2010-28338/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702)

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