What was found
THIS IS A NORMALLY OPEN OIL PRESSURE SWITCH. CONTACTS CLOSE AT 4 PSI TO ACTIVATE THE ENGINE HR METER. THE SWITCH CONSTRUCTION IS METAL BODY, CRIMPED ON THE PLASTIC SWITCH. THIS IS WHERE THE OIL LEAK PROBLEM STARTS. THIS IS THE SECOND SWITCH TO FAIL AND LEAK IN 200 HRS. ALSO, TRAINING ACFT HAVE THESE SWITCHES TO KEEP UP WITH RENTAL HRS OF THE ACFT. THEY OPERATE IN UP TO GO TO 100 PSI OIL PRESSURE AND HAVE SEEN MANY DEVELOP AN OIL LEAK, NOT JUST THIS ONE IN THE REPORT. THE LEAKING OIL IS A FIRE HAZZARD OR ENGINE FAILURE, PN IS 10-00813. THIS OIL PRESSURE SWITCH HAD BEEN IN SERVICE 600 HRS PREVIOUS, SWITCH LASTED 200 HRS.