# Proposed AD FAA-2005-22146: Bombardier Model DHC-7 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-11-02
- Products: Bombardier
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: March 27, 2006, 71 FR 15063
- Comments due: April 21, 2006
- Became: [AD 2006-11-02](https://openairdocs.org/ad/2006-11-02)
- Docket: FAA-2005-22146 (https://www.regulations.gov/docket/FAA-2005-22146, where comments are filed)
- Project: 2002-NM-184-AD
- FR document: E6-4400
- Official PDF: https://openairdocs.org/files/sha256/07/2b/072b456b5228ad43c6d29def3e16f376c7f32eaa6bc0182bf9841d669739ce76 (from https://www.govinfo.gov/content/pkg/FR-2006-03-27/pdf/E6-4400.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/03/27/E6-4400/airworthiness-directives-bombardier-model-dhc-7-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BB45D4505B63C8048625713E006C9293.0001
- Page: https://openairdocs.org/proposed/FAA-2005-22146

## Summary

The FAA is revising an earlier NPRM for an airworthiness directive (AD) that applies to all Bombardier Model DHC-7 airplanes. The original NPRM would have required implementing a corrosion prevention and control program (CPCP) either by accomplishing specific tasks or by revising the maintenance inspection program to include a CPCP. The original NPRM resulted from a determination that, as airplanes age, they are more likely to exhibit indications of corrosion. This action revises the original NPRM by clarifying certain compliance aspects of the proposed AD that were not adequately defined in the original NPRM. We are proposing this supplemental NPRM to prevent structural failure of the airplane due to corrosion.

## Notices in this docket

- Aug 22, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-16535, comments due Sep 21, 2005 (https://www.federalregister.gov/documents/2005/08/22/05-16535/airworthiness-directives-bombardier-model-dhc-7-series-airplanes)
- Mar 27, 2006: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document E6-4400, comments due Apr 21, 2006 (https://www.federalregister.gov/documents/2006/03/27/E6-4400/airworthiness-directives-bombardier-model-dhc-7-airplanes)

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