What was found
FLT 8414 ON APPROACH TO MIA CREW REPORTED NR 1 ENGINE LOST OIL, ENG. NR 1 WAS SHUTDOWN AS A PRECAUTION. A/C LANDED AT INTENDED DESTINATION WITHOUT FURTHER INCIDENT. MX INSPECTION OF THE NR 1 ENGINE FOUND OIL FILTER & GEARBOX CHIP DETECTORS HAD NO METAL, INSPECTION OF MAGNETIC CHIP DETECTORS IAW MM79-20-12. FOUND OIL PRESSURE TUBE AT MAIN OIL FILTER HOUSING LEAKING, REPLACED TORN O-RING, REPLACED MAIN OIL FILTER & O-RINGS & ACCOMPLISHED HELICOIL INSERT REPAIR ON GEARBOX PER PWC MM 72-61-01, RAN NR 1 ENGINE TO TAKE-OFF POWER 2.19 EPR, LEAK CHECK GOOD IAW MM 79-20-11, OIL PRESSURE 50 PSI ALL PARAMETERS NORMAL IAW AMERIJET FORM B-41, NR 1 ENG. OIL SAMPLE WAS TAKEN FOR SOAP TEST. AIRCRAFT RETURNED TO SERVICE.