What was found
DURING FLIGHT A FUEL LEAK WAS DETECTED ON LEFT MAIN FUEL TANK. ALL FUEL FLOW NORMAL AND ENGINE CONSUMPTION WAS NORMAL. PER AMM 72-00-04 P 197 ACCOM T/S FOUND FUEL PUMP DUCT CORK. ADJ IAW 73-34-01PG 201. RUN UP TEST NORMALLY IAW 72-44-0 PAG 532 , NO LEAKS FOUND. AFTER REACH TOP OF CLIMB NOTICED LACK OF FUEL BUT DUE TO FLIGHT LEVEL PLAN CHANGED 320 TO 340, DIDN'T NOTICE ABNORMAL SITUATION. 5 MINUTES BEFORE TOP OF DESCENT WE HAD A LACK OF 3000 POUNDS, MADE APPROX AND AFTER SECOND ATTEMPT LANDED. ATC WAS INFORMED BEFORE LANDING AND THEY KEPT THE PLANE IN A PARALLEL WAY TO AVOID FUEL CONTAMINATION OF THE PLATFORM. AVIANCA'S MAINTENANCE TEAM NEEDS TO WAIT FOR CIVIL INSPECTOR TO CHECK THE AIRPLANE.