AFTER COMPLETE LOSS OF OIL PRESSURE A CIRRUS SR20 PLT PERFORMS AN EMER DIVERSION AND LNDG AT ZZZ-US.

Narrative

THE ACFT WAS TAKEN TO ZZZ ARPT FOR AN OIL CHANGE AND SOME SIMPLE SVC BULLETINS. DISCUSSION WAS MADE ABOUT SCHEDULING THE 100 HR INSPECTION AND IT WAS AGREED THAT THE ENG PORTION WOULD BE DONE AT THIS TIME AND THE ACFT WOULD BE BROUGHT BACK IN 2 WKS FOR THE AIRFRAME PORTION. 2 MECHS WERE WORKING ON THE ACFT. AFTER THE COWL WAS REINSTALLED ON THE ACFT; THE ENG WAS RUN AND LEAKS CHKED FOR FOLLOWING THE OIL CHANGE. THE ACFT WAS TAXIED OUT FOR TKOF AND A FULL RUN-UP WAS PERFORMED USING THE CHKLIST. ABOUT 12 MINS INTO THE FLT; THE LOW OIL PRESSURE LIGHT CAME ON AND UPON CHKING THE MFD (MULTI-FUNCTIONAL DISPLAY); THE OIL PRESSURE WAS NOTED TO BE AT 18 PSI. A PWR REDUCTION WAS MADE; GLIDE SPD ESTABLISHED AND A FIELD WAS SELECTED FOR A FORCED LNDG. ONCE ESTABLISHED FOR A LNDG; THE GPS WAS CHKED FOR THE CLOSEST ARPT. THIS HAPPENED TO BE THE ARPT 4 MI TO THE E. THE DECISION WAS MADE TO HEAD TOWARDS THE ARPT KEEPING FIELDS UNDERNEATH AS POSSIBLE LNDG SITES IF THE ENG SHOULD SEIZE. OIL PRESSURE WAS READING 0 PSI AT THIS POINT. A R BASE TO RWY 17 WAS ENTERED AND A NON-EVENTFUL LNDG PERFORMED. ONCE SAFELY OFF THE RWY; THE ENG WAS SHUT DOWN AND THE ACFT SECURED INTO A TIE DOWN. THE COWL WAS REMOVED WHICH REVEALED THE OIL PLUG SITTING ON THE BOTTOM OF THE COWL. IT HAD NOT BEEN SAFETY WIRED TO THE OIL PAN. THE CAUSE OF THIS PROB COULD BE ANY COMBINATION OF THE FOLLOWING: PRESSURE FROM THE PLT TO DO EXTRA WORK DUE TO TIGHT SCHEDULES; LACK OF COM BTWN 2 MECHS WORKING ON THE ACFT AND OR FAILURE TO PERFORM A DETAILED INSPECTION PRIOR TO RETURNING THE ACFT TO SVC. NO PERSONS OR PROPERTY WERE INJURED IN THIS SIT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR RESPONDED TO THE QUESTION REGARDING THE STATE OF THE ENG AFTER BEING RUN WITH ZERO OIL PRESSURE BY STATING THAT THE FILTER WAS FOUND TO HAVE SOME METAL CHIPS INSIDE DURING THE POSTFLT RUN-UP INSPECTION. THE MAINT FACILITY OWNED UP TO THE MISTAKE MADE BY ONE OF THEIR MAINT PERSONS AND REPLACED THE 'CONT IO 360' ENG WITH A NEW ONE. THE ACFT WAS NEW AND WAS ON A LEAST BACK.