What was found
ON FAE - FLT 945 - KMEM TO NBJ, DURING CLIMB, THROUGH FL260 NR 3 ENGINE STARTED FLUCTUATING INTERMITTENT AT FIRST THEN STEADY. AFTER LEVEL OFF AT FL290, NR 3 ENGINE CONTINUED TO FLUCTUATE. AIRCRAFT RETURNED TO KMEM. ON GROUND MAINTENANCE INSPECTED NR 3 ENGINE AND FOUND LOOSE 'B' NUT ON THE FUEL CONTROL UNIT. 'B' NUT WAS TIGHTENED AND LEAK CHECKED PER MM 73-20-00. ENGINE WAS RAN IAW MM 71-00-00 AND OPS CHECKED NROMAL. AIRCRAFT RETURNED TO SERVICE. (M)