# Proposed AD FAA-2016-7418: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-20-09
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 28, 2016, 81 FR 41889
- Comments due: August 12, 2016
- Became: [AD 2016-20-09](https://openairdocs.org/ad/2016-20-09)
- Docket: FAA-2016-7418 (https://www.regulations.gov/docket/FAA-2016-7418, where comments are filed)
- Project: 2015-NM-163-AD
- FR document: 2016-14965
- Official PDF: https://openairdocs.org/files/sha256/5d/4f/5d4f0aa681a7b2450352001fd80c088962f6665be15bbb5f5f441dbc5ff0c312 (from https://www.govinfo.gov/content/pkg/FR-2016-06-28/pdf/2016-14965.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/06/28/2016-14965/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/27D06A1E1DBBEC8586257FE0004C7BD0.0001
- Page: https://openairdocs.org/proposed/FAA-2016-7418

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2A12 (CL-601 Variant), and CL- 600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. This proposed AD was prompted by a report that a potential chafing condition exists between the negative-G fuel feed drain line of the auxiliary power unit (APU) and its surrounding structure and components. This proposed AD would require, for certain airplanes, a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU, and corrective actions if necessary. For certain other airplanes, this proposed AD would require replacement of the APU negative-G fuel feed tube assembly and the drain line. We are proposing this AD to prevent a chafing condition in the negative-G fuel feed drain line, which can result in fuel leaking from the drain line. Leakage of the negative-G fuel feed drain line is a dormant failure. This condition, in combination with a nearby hot surface or other potential ignition source, could result in an uncontrolled fire in the aft equipment bay.

## Notices in this docket

- Jun 28, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-14965, comments due Aug 12, 2016 (https://www.federalregister.gov/documents/2016/06/28/2016-14965/airworthiness-directives-bombardier-inc-airplanes)

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