What was found
(CAN) RT ENGINE SHUTDOWN DUE TO OIL PRESSURE, LIGHT ON AND OIL PRESSURE BETWEEN 60 AND 60 PSI. AFTER INVESTIGATION FOUND ONE O-RING LEAKING ON RT ENGINE REDUCTION GEARBOX OIL TRANSFER TUBE, REPLACED O-RING P/N AS3209-114. AFTER DISCUSSION WITH PILOTS, DID NOT EXCEED TRANSIENT LIMITS IAW MFG MM 3034342 REV.26 CHAP 71-00-00 TABLE 503, OIL LEVEL ADJUSTED, LOST OF 5 QTS OF OIL. ENGINE INSPECTED IAW MFG MM 3034342 REV.26 CHAP 72-00-00 INSP.Q. RUN-UP CARRIED OUT, OIL FILTER CHECKED FOR CONTAMINATION. FOUND SERVICEABLE. NOTE: CHIP DETECTOR TO BE CHECK DAILY FOR ONE WEEK, MIN25 HOURS. (IAW EMM 72-00-00 P640 Q(2)(B), OIL FILTER TO BE CHECK BETWEEN 25-65 HOURS.