As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AC WAS MAKING AN APPROACH AND HAD OIL SPLASH ON THE WINDSHIELD. PILOT MADE A FULL STOP AND TAXIED BACK TO RAMP. OIL PRESSURE AND TEMPERATURE STAYED IN THE GREEN. UPON INVESTIGATION, FOUND THE CAUSE OF THE OIL LEAK TO BE THE (SENSOR-OIL PRESSURE (HOBBS-SWITCH) PN 83278 TO BE THE SOURCE OF THE LEAK. THE SENSOR HAD FAILED INTERNALLY AND THE OIL WAS COMING FROM AROUND THE PRONGS INSIDE THE CONNECTOR AREA. PROBABLE CAUSE-BAD DESIGN. PREVENT REOCCURRENCES-UNKNOWN. (K)