# Proposed AD FAA-2018-0792: Bombardier, Inc., Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-03-29
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 17, 2018, 83 FR 46895
- Comments due: November 1, 2018
- Became: [AD 2019-03-29](https://openairdocs.org/ad/2019-03-29)
- Docket: FAA-2018-0792 (https://www.regulations.gov/docket/FAA-2018-0792, where comments are filed)
- FR document: 2018-19841
- Official PDF: https://openairdocs.org/files/sha256/2c/cf/2ccf7959702bca329b45851356cc9ff666a138273be2b598130a112f83aa9f65 (from https://www.govinfo.gov/content/pkg/FR-2018-09-17/pdf/2018-19841.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/09/17/2018-19841/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1202EC725E5DA9838625830B00493DD8.0001
- Page: https://openairdocs.org/proposed/FAA-2018-0792

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This proposed AD was prompted by an incident of uncommanded nose wheel steering (NWS) in- service; subsequent investigation revealed that the steering selector valve (SSV) is susceptible to jamming in the open position due to particulate contamination of the hydraulic system. This proposed AD would require modifying the left-hand hydraulic system of the NWS control system and, for certain airplanes, torqueing the fittings on a certain tube assembly. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 17, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-19841, comments due Nov 1, 2018 (https://www.federalregister.gov/documents/2018/09/17/2018-19841/airworthiness-directives-bombardier-inc-airplanes)

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