# Proposed AD FAA-2006-26217: Bombardier Model DHC-8-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-01-14
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 2, 2006, 71 FR 64482
- Comments due: December 4, 2006
- Became: [AD 2007-01-14](https://openairdocs.org/ad/2007-01-14)
- Docket: FAA-2006-26217 (https://www.regulations.gov/docket/FAA-2006-26217, where comments are filed)
- Project: 2006-NM-209-AD
- FR document: E6-18461
- Official PDF: https://openairdocs.org/files/sha256/78/93/78939fbab940a4c8438b34d301911c25fc44875c683046940c2720cebe4ec7be (from https://www.govinfo.gov/content/pkg/FR-2006-11-02/pdf/E6-18461.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/11/02/E6-18461/airworthiness-directives-bombardier-model-dhc-8-400-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D31A5B3C47C7C6868625721A005E207D.0001
- Page: https://openairdocs.org/proposed/FAA-2006-26217

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model DHC-8-400 series airplanes. This proposed AD would require revising the Airworthiness Limitations Items (ALI) of the maintenance requirements manual to require additional inspection requirements of the maintenance requirements manual for certain principal structural elements (PSEs) related to fuselage cutouts and to reduce an inspection threshold for an existing ALI task on the aft entry door. This proposed AD results from data obtained from the manufacturer's fatigue testing. We are proposing this AD to detect and correct fatigue cracking of certain PSEs, which could result in reduced structural integrity of the airplane.

## Notices in this docket

- Nov 2, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-18461, comments due Dec 4, 2006 (https://www.federalregister.gov/documents/2006/11/02/E6-18461/airworthiness-directives-bombardier-model-dhc-8-400-series-airplanes)

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