# Proposed AD FAA-2015-3986: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-16-15
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 19, 2015, 80 FR 63147
- Comments due: December 3, 2015
- Became: [AD 2016-16-15](https://openairdocs.org/ad/2016-16-15)
- Docket: FAA-2015-3986 (https://www.regulations.gov/docket/FAA-2015-3986, where comments are filed)
- Project: 2015-NM-057-AD
- FR document: 2015-26217
- Official PDF: https://openairdocs.org/files/sha256/cc/af/ccafaa9c17d0fcb4b092ad1d84ed2e1c1f99c48bdca96f9572179d95dc0634a1 (from https://www.govinfo.gov/content/pkg/FR-2015-10-19/pdf/2015-26217.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/10/19/2015-26217/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/630C4CAD98747FDA86257EE3004C9EBB.0001
- Page: https://openairdocs.org/proposed/FAA-2015-3986

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes. This proposed AD was prompted by reports of chafing damage due to insufficient clearance on the main landing gear (MLG) stabilizer brace, the nacelle A-frame structure, and the adjacent electrical wiring harnesses. An insufficient fillet radius may also exist on certain airplanes. This proposed AD would require, depending on airplane configuration, an inspection of the nacelle A-frame structure for insufficient fillet radius; an inspection for cracking of affected structure, and rework or repair if necessary, and rework of the nacelle A-frame structure; repetitive inspections of the nacelle A-frame structure and the MLG stabilizer brace for insufficient clearance and damage, and repair if necessary, and rework of the nacelle A-frame structure, which would terminate the repetitive inspections; installation of new stop brackets and a shim on each MLG stabilizer brace assembly; and rework of the electrical wiring harnesses in the nacelle area. We are proposing this AD to detect and correct chafing damage and subsequent premature cracking and fracture of the nacelle A- frame structure, which could result in failure of the MLG stabilizer brace and loss of the MLG down-lock indication, which could adversely affect the safe landing of the airplane.

## Notices in this docket

- Oct 19, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-26217, comments due Dec 3, 2015 (https://www.federalregister.gov/documents/2015/10/19/2015-26217/airworthiness-directives-bombardier-inc-airplanes)

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