Narrative:

During preflight walkaround, the first officer discovered oil leaking from the aft equipment bay. Maintenance found the source of the oil leak to be in the oil servicing line for the #2 (right) engine. The engine oil servicing system was then deferred. The right engine oil quantity was found to be adequate. The maintenance signoff was completed and the flight departed for cvg 2 hours late. Takeoff, climb and cruise to cvg were uneventful. Some mi west of indianapolis, we discovered the right engine oil pressure fluctuating between 40-60 psi. At FL200 we recorded the #2 oil pressure between 30-40 psi and I radioed maintenance control to advise of the problem. During discussion with maintenance, the right oil pressure warning message came on briefly. I advised maintenance and said I would call them back as it looked like we might have to shut down the engine. The oil pressure warning cleared and we asked cincinnati approach control for priority handling to the airport, described our situation and said that we would prefer to land with both engines operating. While on the visual approach, 5 mi left base for runway 36L, gear down, flaps 45 degrees and landing check complete, I started the turn to final when #2 oil pressure dropped to 19 psi and we got the 'engine oil' aural warning. We decided to shut down the #2 engine. At this time we declared an emergency. Callback conversation with reporter revealed the following information: reporter stated the oil leak that was discovered by the first officer and was deferred prior to departure was in the remote oil service system for the right engine. The reporter said the right engine oil service valve failed to open and forced engine oil back down the deferred oil service line which was cracked, causing the loss of engine oil.

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Original NASA ASRS Text

Title: A CANADAIR CL65 IN CRUISE AT FL200 EXPERIENCED THE R ENG OIL PRESSURE DECREASE AND OIL LEVEL WARNING. DECLARED AN EMER AND SHUT DOWN R ENG. ON EMER DSCNT OVERSHOT INTXN CLRNC.

Narrative: DURING PREFLT WALKAROUND, THE FO DISCOVERED OIL LEAKING FROM THE AFT EQUIP BAY. MAINT FOUND THE SOURCE OF THE OIL LEAK TO BE IN THE OIL SVCING LINE FOR THE #2 (R) ENG. THE ENG OIL SVCING SYS WAS THEN DEFERRED. THE R ENG OIL QUANTITY WAS FOUND TO BE ADEQUATE. THE MAINT SIGNOFF WAS COMPLETED AND THE FLT DEPARTED FOR CVG 2 HRS LATE. TKOF, CLB AND CRUISE TO CVG WERE UNEVENTFUL. SOME MI W OF INDIANAPOLIS, WE DISCOVERED THE R ENG OIL PRESSURE FLUCTUATING BTWN 40-60 PSI. AT FL200 WE RECORDED THE #2 OIL PRESSURE BTWN 30-40 PSI AND I RADIOED MAINT CTL TO ADVISE OF THE PROB. DURING DISCUSSION WITH MAINT, THE R OIL PRESSURE WARNING MESSAGE CAME ON BRIEFLY. I ADVISED MAINT AND SAID I WOULD CALL THEM BACK AS IT LOOKED LIKE WE MIGHT HAVE TO SHUT DOWN THE ENG. THE OIL PRESSURE WARNING CLRED AND WE ASKED CINCINNATI APCH CTL FOR PRIORITY HANDLING TO THE ARPT, DESCRIBED OUR SIT AND SAID THAT WE WOULD PREFER TO LAND WITH BOTH ENGS OPERATING. WHILE ON THE VISUAL APCH, 5 MI L BASE FOR RWY 36L, GEAR DOWN, FLAPS 45 DEGS AND LNDG CHK COMPLETE, I STARTED THE TURN TO FINAL WHEN #2 OIL PRESSURE DROPPED TO 19 PSI AND WE GOT THE 'ENG OIL' AURAL WARNING. WE DECIDED TO SHUT DOWN THE #2 ENG. AT THIS TIME WE DECLARED AN EMER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE OIL LEAK THAT WAS DISCOVERED BY THE FO AND WAS DEFERRED PRIOR TO DEP WAS IN THE REMOTE OIL SVC SYS FOR THE R ENG. THE RPTR SAID THE R ENG OIL SVC VALVE FAILED TO OPEN AND FORCED ENG OIL BACK DOWN THE DEFERRED OIL SVC LINE WHICH WAS CRACKED, CAUSING THE LOSS OF ENG OIL.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.