What was found
LARGE N1 FLUCTUATIONS AT HIGH POWER SETTINGS AFTER TAKEOFF. ERRATIC FUEL FLOW, POWER FLUCTUATIONS COULD BE FELT. RETURNED TO FIELD. MEL 76-11-1 CAT: C DUE: 14JAN2021. LARGE N1 FLUCTUATIONS AT HIGH POWER SETTINGS AFTER TAKEOFF. ERRATIC FUEL FLOW, POWER FLUCTUATIONS COULD BE FELT. RETURNED TO FIELD. BOTH ENGINE SPEED CONTROL SYSTEMS PLACED ON DMI, PER MEL BY AUTHORITY OF MX CONTROL. BOTH SWITCHES SET TO OFF POSITION AND PLACARD INSTALLED. PERFORMED OPERATIONAL RUN OF BOTH ENGINES, IN REF TO CRJ 200 AMM. COULD ONLY DUPLICATE WITH SPEED SWITCHES ACTIVATED.