Pilot Magazine | Dec 01, 2011
Aircraft designers pray at the altar of system redundancy, so virtually all essential aircraft systems come with backups. Of course, that goes double for twins—especially turbine-powered twins. But what about a failure of a single-engine turboprop's sole fuel control unit (FCU)? If it decides to go belly-up the engine will rapidly spool down and summarily quit. Among other cues, you'll detect the onset of an FCU failure by observing drops in the torque, fuel flow, and gas generator rpm. The engine noise level will also be a clue.