7900 ENGINE OIL SYSTEM (AIRFRAME) 7910 ENGINE OIL STORAGE (AIRFRAME) 7920 ENGINE OIL DISTRIBUTION (AIRFRAME) 7921 ENGINE OIL COOLER 7922 ENGINE OIL TEMP. REGULATOR 7923 ENGINE OIL SHUTOFF VALVE 7930 ENGINE OIL INDICATING SYSTEM 7931 ENGINE OIL PRESSURE 7932 ENGINE OIL QUANTITY 7933 ENGINE OIL TEMPERATURE