What was found
ENROUTE, EXPERIENCED AN ENGINE ROLL BACK AND FLAMEOUT ON THE RT ENGINE AT 21,000 FT. NO ATTEMPT WAS MADE TO RESTART. EMERGENCY DECLARED AND ENGINE SECURED ACCORDING TO CHECKLIST. ACFT DIVERTED AND MADE A SUCCESSFUL LANDING. MX FOUND SUPPLY LINE FLOW FROM THE MAIN TANK WAS IMPEDED. GRAVITY FEED LINE INFLOW ORIFICE ACCESSED AND A MX INSTRUCTION PAPER TAG WAS FOUND PARTIALLY BLOCKING THE ORIFICE. THE OBSTRUCTION WAS REMOVED AND THE FLOW TO THE NACELLE TANK WAS RETURNED TO NORMAL.