TM   10-4320-318-14 Item No. 1 2 3 4 5 6 7 8 9 10 Table 2-2. Operator Preventive Maintenance Checks and Services Interval Before Before Before Before Before Before Before Before During During Location Item To Check/ Service Pump Pump Suction and  Discharge Lines Fuel  Tank Egine Egine Oil Level Air Filter Fuel  Hoses Engine Cooling Ribs Pump Pump  Suction and  Discharge Lines Procedure Inspect for leaks. Inspect for Leaks. CAUTION DO NOT LET ENGINE RUN OUT OF FUEL. FUEL SYS- TEM WILL BECOME AIR BOUND. Check fuel level and add fuel as necessary. Inspect engine for oil and fuel leaks Check oil level before operation and every eight hours of opera- ion. Refer for LO 10-4320-318-12. Inspect airflow indicator during Operation. If past red indicator af- ter changing air filter, replace air filter  element  (para.  3-5).  Reset air flow indicator after changing air  filter  element Check for leaking fuel hoses and corroded  fuel  hose  connections. Tighten connections. Notify Unit Maintenance if fuel hose leaks or connections  are  severely  cor- roded. Ceck for dirt accumulation on ribs and air passages. Clean as nec- essary. If rib is damaged, notify Unit  Maintenance. Inspect  for  leaks. Inspect  for  leaks. Not Fully Mission Capable  If: Class II leakage. Class III leakage. Class III leaks. Oil level below “min” mark on engine oil dip- stick. Dirty air filter element. Any leak. Ribs are dirty or dam- aged.  Air  passages  are dogged. Class II leakage. Class II leakage. 2-5