BOMBARDIER Challenger 601-3A, 601-3R and 604 airplanes [Docket No. FAA-2011-1223; Directorate Identifier 2011-NM-173-AD] – This proposed AD would require operators to replace the air-driven generator (ADG) generator control unit (GCU), per the instructions of Bombardier Service Bulletin 605-24-003...

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