# Proposed AD FAA-2011-0479: Bombardier Inc. Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 Airplanes; Equipped With Certain Cockpit Door Installations

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-21-04
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 8, 2011, 76 FR 33173
- Comments due: July 25, 2011
- Became: [AD 2011-21-04](https://openairdocs.org/ad/2011-21-04)
- Docket: FAA-2011-0479 (https://www.regulations.gov/docket/FAA-2011-0479, where comments are filed)
- Project: 2010-NM-154-AD
- FR document: 2011-14091
- Official PDF: https://openairdocs.org/files/sha256/66/cd/66cd51ecbeec511f6cb32c04b0c9d4a99b45bfdac390761c3b9bb08b3a4e68cf (from https://www.govinfo.gov/content/pkg/FR-2011-06-08/pdf/2011-14091.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/06/08/2011-14091/airworthiness-directives-bombardier-inc-model-dhc-8-102--103--106--201--202--301--311-and--315
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/825F1F3B7C219A4F862578A9004BE1E9.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0479

## 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:

During structural testing of the cockpit door, it was observed that the door lower hinge block rotated which resulted in disengagement of the mating hinge pin and excessive door deflection. The lower hinge block rotated because it was attached to its support structure with only one attachment bolt, which prevented it from reacting to any moment force. This condition, if not corrected could result in breakage and uncontrolled release of the cockpit door under certain decompression situations.

After incorporation of Modsum 8Q900267 * * *, an operator reported a failure to complete the cockpit door removal function test. This condition, if not corrected, could result in the inability to remove the cockpit door for emergency egress. * * *

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

## Notices in this docket

- Jun 8, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-14091, comments due Jul 25, 2011 (https://www.federalregister.gov/documents/2011/06/08/2011-14091/airworthiness-directives-bombardier-inc-model-dhc-8-102--103--106--201--202--301--311-and--315)

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