# Proposed AD FAA-2011-0043: Bombardier, Inc. Model DHC-8-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-11-02
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 23, 2011, 76 FR 9982
- Comments due: April 11, 2011
- Became: [AD 2011-11-02](https://openairdocs.org/ad/2011-11-02)
- Docket: FAA-2011-0043 (https://www.regulations.gov/docket/FAA-2011-0043, where comments are filed)
- Project: 2010-NM-192-AD
- FR document: 2011-4011
- Official PDF: https://openairdocs.org/files/sha256/73/c5/73c54702468fa60da9c88de94e7bfecd088c443f31b4323a7c51fc4a3f8e215a (from https://www.govinfo.gov/content/pkg/FR-2011-02-23/pdf/2011-4011.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/02/23/2011-4011/airworthiness-directives-bombardier-inc-model-dhc-8-400-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5E07E80DE14A1C5A86257840004E388E.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0043

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

During production quality inspections of the aeroplane fuel motive flow system, it was discovered that some motive flow check valves (MFCV) were manufactured with an outlet fitting containing red anodized threads. These MFCV do not provide adequate electrical bonding between the valve and the adjacent fitting.

In the absence of proper electrical bonding within the motive flow system, the aeroplane fuel tank could be exposed to ignition sources in the case of a lightning strike.

* * * * *

The unsafe condition is the potential for ignition sources inside the fuel tanks, which, in combination with flammable fuel vapors, could resultin a fuel tank explosion and consequent loss of the airplane. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Feb 23, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-4011, comments due Apr 11, 2011 (https://www.federalregister.gov/documents/2011/02/23/2011-4011/airworthiness-directives-bombardier-inc-model-dhc-8-400-series-airplanes)

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