What was found
AIRCREWS REPORT ENGINE OIL PRESSURE TOO LOW OR TOO HIGH DURING GROUND AND FLIGHT OPERATIONS. ERRONEOUS OIL PRESSURE GAUGE NEEDLE INDICATIONS HAVE CAUSED EMERGENCY LANDINGS. THE OIL PRESSURE SENDER/TRANSDUCER IS MANUFACTURED BY VDO IN GERMANY AND DISTRIBUTED/TESTED BY B. F. GOODRICH AND INSTRUMENT TECH (P/N 3060-0018, SAL P/N 12634096BFG AND 12634041IT). THE USAFA CO AND HONDO, TX HAVE REPLACED 210 SENDER UNITS. THE SENDER IS CONNECTED TO A ROCHESTER INSTRUMENT CLUSTER. THE SENDING UNIT AND OIL PRESSSURE GAUGE MAY HAVE AN ELECTRICAL RESISTANCE MISMATCH. THE CIRCUIT MAY BE UNBALANCED. IT IS POSSIBLE A 1050 OHM RESISTOR ADDED TO THE CIRCUIT MAY PROVIDE BETTER LASTING RESULTS. TWO YEARS AND 50,00 FLYING HO