# Proposed AD FAA-2005-21435: Bombardier Model DHC-8-401 and -402 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-18-17
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 14, 2005, 70 FR 34409
- Comments due: July 14, 2005
- Became: [AD 2005-18-17](https://openairdocs.org/ad/2005-18-17)
- Docket: FAA-2005-21435 (https://www.regulations.gov/docket/FAA-2005-21435, where comments are filed)
- Project: 2004-NM-163-AD
- FR document: 05-11709
- Official PDF: https://openairdocs.org/files/sha256/80/3d/803d88c427f72931e843fc30cdb71d8fac0aab0aa46c204a4dfab837de96aaf6 (from https://www.govinfo.gov/content/pkg/FR-2005-06-14/pdf/05-11709.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/06/14/05-11709/airworthiness-directives-bombardier-model-dhc-8-401-and--402-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C3DE2341CCC01AEA86257020006B7840.0001
- Page: https://openairdocs.org/proposed/FAA-2005-21435

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model DHC-8-401 and -402 airplanes. This proposed AD would require a one-time inspection of the fuel and hydraulic tubes, and corrective actions if necessary. This proposed AD would also require modifying fairlead plate assemblies. This proposed AD is prompted by reports of chafing between fuel and hydraulic tubes and the fairlead plate where the tubes pass through the firewall. We are proposing this AD to prevent chafing of the fuel and hydraulic tubes, which could lead to fuel and/or hydraulic fluid leakage in the engine nacelle area and consequent fire or explosion.

## Notices in this docket

- Jun 14, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-11709, comments due Jul 14, 2005 (https://www.federalregister.gov/documents/2005/06/14/05-11709/airworthiness-directives-bombardier-model-dhc-8-401-and--402-airplanes)

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