What was found
(CAN) FLAMEOUT DURING A FLIGHT TEST AT FL250, WHILE CHECKING AIRFRAME OUTFLOW AND SAFETY VALVE, THE ENGINE SPOOLED DOWN AND FLAMED OUT. AN UNEVENTFUL SINGLE ENGINE LANDING WAS MADE. POST FLIGHT TROUBLESHOOTING IDENTIFIED A FUEL CONTROL (FCU) ADJUSTMENT ISSUE. THE FCU WILL BE REPLACED.