What was found
RETURNED TO DEPARTURE; AIRCRAFT WAS GROUNDED: THE NR 2 ENGINE INBD COWLING CAME OFF OF THE ACFT AFTER TAKEOFF. NO ABNORMAL ENGINE INDICATIONS OR ABNORMAL FLIGHT CHARACTERISTICS WERE NOTED BY THE FLIGHT CREW AND THE ACFT RETURNED TO DEPARTURE WHERE THE ACFT LANDED SAFELY WITH NO FURTHER INCIDENTS. EMERGENCY EQUIPMENT WAS DISPATCHED BY THE ATC TOWER. MAINTENANCE ACCOMPLISHED INSPECTIONS AND REPAIRED THE DAMAGED STRUCTURE ASSOCIATED WITH THIS EVENT IAW EA 261219, 261421 & 261417.