# Proposed AD FAA-2005-20860: Bombardier Model DHC-8-400, -401, and - 402 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-12-15
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 6, 2005, 70 FR 17354
- Comments due: May 6, 2005
- Became: [AD 2005-12-15](https://openairdocs.org/ad/2005-12-15)
- Docket: FAA-2005-20860 (https://www.regulations.gov/docket/FAA-2005-20860, where comments are filed)
- Project: 2005-NM-043-AD
- FR document: 05-6764
- Official PDF: https://openairdocs.org/files/sha256/89/a0/89a0c63aa7f1b9db9d8350ec422dcec8c1e7b26434888ca90b3845abe75eb20b (from https://www.govinfo.gov/content/pkg/FR-2005-04-06/pdf/05-6764.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/04/06/05-6764/airworthiness-directives-bombardier-model-dhc-8-400--401-and--402-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DD547CA368C69EAA86256FDB005CB1F9.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20860

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model DHC-8-400, -401, and -402 airplanes. This proposed AD would require revising the Airworthiness Limitation section of the Instructions for Continued Airworthiness of the Dash 8 400 Series (Bombardier) Maintenance Requirements Manual to reduce the life limits of the main landing gear (MLG) orifice support tube, upper bearing, and piston plug; and to reduce the threshold for initiating repetitive detailed inspections for cracking of the engine isolator brackets. This proposed AD is prompted by the discovery of fatigue failures, during type certification fatigue testing, at the engine isolator bracket and at the orifice support tube, upper bearing, and piston plug in the shock strut assembly of the MLG, which are principal structural elements. We are proposing this AD to prevent the development of cracks in these principal structural elements, which could reduce the structural integrity of the engine installation and the MLG. Reduced structural integrity of the engine installation could result in separation of the engine from the airplane, and reduced structural integrity of the MLG could result in collapse of the MLG.

## Notices in this docket

- Apr 6, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6764, comments due May 6, 2005 (https://www.federalregister.gov/documents/2005/04/06/05-6764/airworthiness-directives-bombardier-model-dhc-8-400--401-and--402-airplanes)

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