What was found
DURING FLIGHT, OBSERVED HIGH OIL TEMPERATURE OF 230 DEGREES FAHRENHEIT, OAT MINUS 10 DEGREES CELCIUS. CHT NORMAL, OIL PRESSURE NORMAL. AFTER FLIGHT, OIL LEVEL 6-1/2 QUARTS, NORMAL. OIL COOLER APPEARED CLEAN, BUT COLD. REMOVED THERMOSTATIC BYPASS VALVE. CHECKED WITH HOT WATER TEST, NOTICED NO MOVEMENT OF VALVE. INSTALLED NEW THERMOSTATIC BYPASS VALVE, SUPERIOR, P/N SL 53E19600, S/N 106U. FLIGHT TEST SHOWED OIL TEMPERATURE OF 170 DEGREES FAHRENHEIT, OAT MINUS NINE DEGREES CELCIUS. ALL CONDITIONS NORMAL. S/N 66755 INSTALLED 12-1-95 AT 703.6 HOURS TTSN PER SB 518C. S/N 10611 INSTALLED 1-4-99 AT 1,713.0 HOURS TTSN.