# Proposed AD FAA-2005-20756: Bombardier Model DHC-8-102, -03, -106, -201, -202, -301, -311, and -315 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-11-10
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 30, 2005, 70 FR 16182
- Comments due: April 29, 2005
- Became: [AD 2005-11-10](https://openairdocs.org/ad/2005-11-10)
- Docket: FAA-2005-20756 (https://www.regulations.gov/docket/FAA-2005-20756, where comments are filed)
- Project: 2004-NM-52-AD
- FR document: 05-6253
- Official PDF: https://openairdocs.org/files/sha256/0e/31/0e313f0f4cae053cf6da0af8d6e4901af30392ba0c00c9cd60656ee9e1902f74 (from https://www.govinfo.gov/content/pkg/FR-2005-03-30/pdf/05-6253.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/03/30/05-6253/airworthiness-directives-bombardier-model-dhc-8-102--03--106--201--202--301--311-and--315-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F376921CAF2D41F286256FD4007253DA.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20756

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model DHC-8-102, -103, -106, -201, -202, -301, - 311 and -315 airplanes. This proposed AD would require installation of check valves in Numbers 1 and 2 hydraulic systems, removal of the filters from the brake shuttle valves, and removal of the internal garter spring from the brake shuttle valves. This proposed AD results from two instances of brake failure due to the loss of hydraulic fluid from both Numbers 1 and 2 hydraulic systems and one incident of brake failure due to filter blockage in the shuttle valve. We are proposing this AD to prevent the loss of hydraulic power from both hydraulic systems which could lead to reduced controllability of the airplane; and to prevent brake failure which could result in the loss of directional control on the ground and consequent departure from the runway during landing.

## Notices in this docket

- Mar 30, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6253, comments due Apr 29, 2005 (https://www.federalregister.gov/documents/2005/03/30/05-6253/airworthiness-directives-bombardier-model-dhc-8-102--03--106--201--202--301--311-and--315-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.