# Proposed AD FAA-2010-0273: Bombardier, Inc. Model DHC-8-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-13-04
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 23, 2010, 75 FR 13682
- Comments due: May 7, 2010
- Became: [AD 2010-13-04](https://openairdocs.org/ad/2010-13-04)
- Docket: FAA-2010-0273 (https://www.regulations.gov/docket/FAA-2010-0273, where comments are filed)
- Project: 2009-NM-134-AD
- FR document: 2010-6306
- Official PDF: https://openairdocs.org/files/sha256/c0/e0/c0e0a2f618c9e4d38e0f73bbf689ba2041159aba7bfc90e7333d767d28a719f0 (from https://www.govinfo.gov/content/pkg/FR-2010-03-23/pdf/2010-6306.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/03/23/2010-6306/airworthiness-directives-bombardier-inc-model-dhc-8-400-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/51B81951A7880FD7862576EF0050FE37.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0273

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

Two in-service incidents have been reported on DHC-8 Series 400 aircraft in which the nose landing gear (NLG) trailing arm pivot pin retention bolt (part number NAS6204-13D) was damaged. One incident involved the left hand NLG tire which ruptured on take-off. Investigation determined that the retention bolt failure was due to repeated contact of the castellated nut with the towing device including both the towbar and the towbarless rigs. The loss of the retention bolt allowed the pivot pin to migrate from its normal position and resulted in contact with and rupture of the tire. The loss of the pivot pin could compromise retention of the trailing arm and could result in a loss of directional control due to loss of nose wheel steering. The loss of an NLG tire or the loss of directional control could adversely affect the aircraft during take off or landing. * * * * *

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Mar 23, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-6306, comments due May 7, 2010 (https://www.federalregister.gov/documents/2010/03/23/2010-6306/airworthiness-directives-bombardier-inc-model-dhc-8-400-series-airplanes)

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