# Proposed AD FAA-2011-1092: Bombardier, Inc. Model BD-700-1A10 and BD-700-1A11 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-03-05
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 26, 2011, 76 FR 66198
- Comments due: December 12, 2011
- Became: [AD 2012-03-05](https://openairdocs.org/ad/2012-03-05)
- Docket: FAA-2011-1092 (https://www.regulations.gov/docket/FAA-2011-1092, where comments are filed)
- Project: 2011-NM-111-AD
- FR document: 2011-27650
- Official PDF: https://openairdocs.org/files/sha256/0c/2c/0c2c065dda46dae90c3fe7f8dbf1e98eca3910b78b34e20c9e50069f6d5648d7 (from https://www.govinfo.gov/content/pkg/FR-2011-10-26/pdf/2011-27650.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/10/26/2011-27650/airworthiness-directives-bombardier-inc-model-bd-700-1a10-and-bd-700-1a11-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/58A546ABAF262CC186257935006FD95B.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1092

## 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:

During a routine inspection, deformation was found at the neck of the pressure regulator body on the oxygen Cylinder and Regulator Assemblies (CRA). An investigation by the vendor * * * revealed that the deformation was attributed to two (2) batches of raw material that did not meet the required tensile strength. This may cause elongation of the pressure regulator neck, which could result in rupture of the oxygen cylinder, and in the case of cabin depressurization, oxygen not being available when required.

* * * * *

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

## Notices in this docket

- Oct 26, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-27650, comments due Dec 12, 2011 (https://www.federalregister.gov/documents/2011/10/26/2011-27650/airworthiness-directives-bombardier-inc-model-bd-700-1a10-and-bd-700-1a11-airplanes)

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