# Proposed AD FAA-2011-0648: Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-23-08
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 29, 2011, 76 FR 38065
- Comments due: August 15, 2011
- Became: [AD 2011-23-08](https://openairdocs.org/ad/2011-23-08)
- Docket: FAA-2011-0648 (https://www.regulations.gov/docket/FAA-2011-0648, where comments are filed)
- Project: 2010-NM-276-AD
- FR document: 2011-16365
- Official PDF: https://openairdocs.org/files/sha256/3f/d3/3fd3a1c0156a9075850db47a465338cc5e750f682493aa67e39e244d3df5da96 (from https://www.govinfo.gov/content/pkg/FR-2011-06-29/pdf/2011-16365.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/06/29/2011-16365/airworthiness-directives-bombardier-inc-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4DF3F8325E0E7E87862578BE004FFCA1.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0648

## 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:

Seven cases of on-ground hydraulic accumulator screw cap/end cap failure have been experienced on CL-600-2B19 aeroplanes, resulting in the loss of the associated hydraulic system and high-energy impact damage to adjacent systems and structure. * * * * * * * *

A detailed analysis of the calculated line of trajectory of a failed screw cap/end cap for each of the accumulators has been conducted, resulting in the identification of several areas where systems and/or structural components could potentially be damaged. Although all of the failures to date have occurred on the ground, an in-flight failure affecting such components could potentially have an adverse effect on the controllability of the aeroplane. * * * * *

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Jun 29, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-16365, comments due Aug 15, 2011 (https://www.federalregister.gov/documents/2011/06/29/2011-16365/airworthiness-directives-bombardier-inc-model-cl-600-2b19-regional-jet-series-100-and-440-airplanes)

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