What was found
AFTER TAKEOFF WHEN GEAR HANDLE WAS RAISED, SMOKE WAS OBSERVED COMING FROM UNDER INSTRUMENT PANEL AT CENTER. SMOKE WAS A PURPLISH COLOR WITH AN ACRID SMELL INDICATING ELECTRICAL ORIGIN. ALSO NOTED FLT DIR- 2, AC C/B POPPED. SMOKE STOPPED AFTER APPROX 1 MIN. BUT SMELL STILL NOTICEABLE IN COCKPIT DURING APPROACH / LANDING AND AFTER BLOCK IN. PER CREW DEBRIEF, SMOKE WAS COMING FROM FLIGHT DIRECTOR MODE CONTROLLER. REPLACED FLIGHT DIRECTOR MODE CONTROLLER. VERIFIED STRONG BURN SMELL FROM CONTROLLER WHEN REMOVED.