# Proposed AD FAA-2010-0515: Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), Model CL-600-2D15 (Regional Jet Series 705), and Model CL-600-2D24 (Regional Jet Series 900) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-17-12
- Products: Bombardier
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: April 6, 2011, 76 FR 18957
- Comments due: May 23, 2011
- Became: [AD 2011-17-12](https://openairdocs.org/ad/2011-17-12)
- Docket: FAA-2010-0515 (https://www.regulations.gov/docket/FAA-2010-0515, where comments are filed)
- Project: 2009-NM-196-AD
- FR document: 2011-8197
- Official PDF: https://openairdocs.org/files/sha256/52/59/5259a033590c3ea12b161d240ad28dd67a8bbc41ad491fb878bf2bd632480d7b (from https://www.govinfo.gov/content/pkg/FR-2011-04-06/pdf/2011-8197.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/04/06/2011-8197/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702-model
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0AB2D4BF447D943C8625786A0048B8EC.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0515

## Summary

We are revising an earlier NPRM for the products listed above. This action revises the earlier NPRM by expanding the scope. 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:

Several cases have been reported of cracks in the joint extrusions securing the outer bondment to the acoustic panel of the nacelle transcowl assemblies. Although there is no effect on flight safety (thrust reverser stowed), thrust reverser deployment under rejected take-off or emergency landing load conditions could potentially result in acoustic panel failure and possible runway debris.

* * * * *

The loss of an acoustic panel during rejected take-off or emergency landing load conditions could leave debris on the runway. This debris, if not removed, creates an unsafe condition for other airplanesduring take-off or landing, as those airplanes could impact debris on the runway and sustain damage. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- May 18, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-11889, comments due Jul 2, 2010 (https://www.federalregister.gov/documents/2010/05/18/2010-11889/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702-model)
- Apr 6, 2011: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2011-8197, comments due May 23, 2011 (https://www.federalregister.gov/documents/2011/04/06/2011-8197/airworthiness-directives-bombardier-inc-model-cl-600-2c10-regional-jet-series-700-701-and-702-model)

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