# Proposed AD FAA-2016-6148: Bombardier, Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-19-11
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 2, 2016, 81 FR 26176
- Comments due: June 16, 2016
- Became: [AD 2016-19-11](https://openairdocs.org/ad/2016-19-11)
- Docket: FAA-2016-6148 (https://www.regulations.gov/docket/FAA-2016-6148, where comments are filed)
- Project: 2015-NM-154-AD
- FR document: 2016-10116
- Official PDF: https://openairdocs.org/files/sha256/6a/a7/6aa7985856b377e5c0df15cbda36ee4ab031022ea7ce56803f0d75a703394b70 (from https://www.govinfo.gov/content/pkg/FR-2016-05-02/pdf/2016-10116.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/05/02/2016-10116/airworthiness-directives-bombardier-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5CE2E604C5A8598086257FA7004F3FBF.0001
- Page: https://openairdocs.org/proposed/FAA-2016-6148

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This proposed AD was prompted by a malfunctioning No. 2 engine intake heater with corrosion on the thermostats and the fuselage skin where the thermostats made contact with the aircraft fuselage skin. This proposed AD would require a general visual inspection for corrosion of the thermostats' mounting surfaces and fuselage skin surface, corrective actions if necessary, and relocating the existing thermostats. We are proposing this AD to prevent corrosion within the thermostats that may cause the switch mechanism to seize in the open position and prevent the activation of the associated engine air intake heater. An inactive engine air intake heater could lead to an engine failure.

## Notices in this docket

- May 2, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-10116, comments due Jun 16, 2016 (https://www.federalregister.gov/documents/2016/05/02/2016-10116/airworthiness-directives-bombardier-inc-airplanes)

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