# Proposed AD FAA-2016-7421: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-22-16
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 1, 2016, 81 FR 43122
- Comments due: August 15, 2016
- Became: [AD 2016-22-16](https://openairdocs.org/ad/2016-22-16)
- Docket: FAA-2016-7421 (https://www.regulations.gov/docket/FAA-2016-7421, where comments are filed)
- Project: 2015-NM-145-AD
- FR document: 2016-15289
- Official PDF: https://openairdocs.org/files/sha256/34/d7/34d7da55874f6367fd4663036377e49807294ffa4f4833026919ca950ed03a6a (from https://www.govinfo.gov/content/pkg/FR-2016-07-01/pdf/2016-15289.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/07/01/2016-15289/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/32D9D8D9EB61F2A186257FE3004CBF69.0001
- Page: https://openairdocs.org/proposed/FAA-2016-7421

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900) airplanes, and CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed AD was prompted by a determination that wear and possible leakage of the high-pressure seal in the cylinder of the No. 3 hydraulic system reservoir could occur and prevent the system from reaching normal operating pressure. This proposed AD would require repetitive operational checks for wear and leakage of the high-pressure seal in the cylinder of the reservoir of the No. 3 hydraulic system, and corrective actions if necessary. We are proposing this AD to detect and correct a malfunctioning temperature indication of the No. 3 hydraulic system. High hydraulic fluid temperature combined with a temperature transducer malfunction could result in un-annunciated overheating of the hydraulicsystem and consequent ignition sources inside the fuel tank, which, combined with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.

## Notices in this docket

- Jul 1, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-15289, comments due Aug 15, 2016 (https://www.federalregister.gov/documents/2016/07/01/2016-15289/airworthiness-directives-bombardier-inc-airplanes)

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