BOMBARDIER Model DHC-8-400 series airplanes [Docket No. FAA-2012-1003; Directorate Identifier 2012-NM-064-AD] – proposes to require replacing all three APDs with new detector assemblies. This proposed AD was prompted by reports of engine fire/overheat detector assemblies advance pneumatic detectors (APDs) failing to reset after activation due to permanent deformation of the detector switch diaphragm after being exposed to high temperatures. FAA is proposing this AD to prevent a continued ...


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