What was found
DURING LANDING, THE LT ENGINE OIL PRESSURE ANNUNCIATOR ILLUMINATED AND CREW NOTED THE OIL PRESSURE WAS AT 23PSI, THE ENGINE WAS SHUT DOWN AND THE AIRCRAFT WAS GROUNDED AND TURNED OVER TO MAINTENANCE FOR TROUBLESHOOTING. CREW ALSO NOTED THE OIL FILTER BYPASS INDICATOR WAS EXTENDED AFTER A POST SHUTDOWN CHECK. THE LT ENGINE OIL FILTER AND AN OIL SAMPLE WERE SENT FOR SPECTROGRAPHIC OIL ANALYSIS, THIS ENGINE HAD 8.3HRS SINCE THE PREVIOUS SOAP SAMPLE AND WAS ON A 25HR RE-SAMPLE FOR CONTAMINATION. RESULTS OF ANALYSIS INDICATED A FAULTY OIL PUMP. AN OVERHAULED PUMP WAS ACQUIRED AND INSTALLED AND THE AIRCRAFT WAS RETURNED TO SERVICE. A RE-SAMPLE OF THE OIL & FILTER IS TO BE PERFORMED IN 25HRS PER ENGINEERING.