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Tue, Sep 15, 2009

AD: Bombardier

AD NUMBER: 2009-18-12

MANUFACTURER: Bombardier Model DHC-8-400 Series Airplanes
SUBJECT: Airworthiness Directive 2009-18-12

SUMMARY: Four aircraft have experienced a dual AC [alternating current] generator shutdown, caused by a broken propeller de-ice bus bar which short-circuited with the backplate assembly

A short circuit can cause a dual AC generator shutdown that, particularly in conjunction with an engine failure in icing conditions, could result in reduced controllability of the aircraft.

Reduced controllability of the airplane in certain operating conditions affects continued safe flight and landing. We are issuing this AD to require actions to correct the unsafe condition on these products.
 

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/3C09322D00B23ECB8625762C004C4671?OpenDocument

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