TM 55-1945-205-24-4 0050 00 2 0050 00 Table 1.  Preventive Maintenance Checks and Services. ITEM NO. INTERVAL MAN- HOURS ITEM TO BE CHECKED OR SERVICED PROCEDURE EQUIPMENT NOT READY/ AVAILABLE IF: 1 Monthly .2 Personnel Shelter 1. Clean heating and air conditioning system indoor air filter. (WP 0097 00) 2. Clean heating and air conditioning system vent air filter. (WP 0099 00) 4 Quarterly 29.0 FC Modules Inspect for water inside all modules. (WP 0053 00) (WP 0059 00) 2 Quarterly 100 Hours .1 Light Tower Quarterly or every 100 operating hours replace the fuel tank in-line fuel filter. (WP 0168 00) 1 Annually .2 Personnel Shelter Clean heating and air conditioning system internal components. (WP 0102 00, WP 0103 00, WP 0106 00) 3 Annually .2 Light Tower Engine 1. Replace air filter element. (WP 0172 00) 2. Perform functional test of engine oil pressure switch in the protection shutdown system. Contact depot maintenance. Contact Specialized Repair Activity (SRA). 4 Annually 2,400 Operating Hours 1.0 FC Modules Annually or every 2,400 hours of operation, pressure test modules and repair leaks, cracks and corrosion. (WP 0054 00, WP 0060 00) Leaks present or structural damage which interferes with operation. 3 Biennially 3.0 Light Tower Engine 1. Drain cooling system, flush cooling system and install new coolant. (WP 0175 00, WP 0176 00) 2. Replace all coolant hoses and clamps. (WP 0177 00, WP 0178 00) 3. Replace all fuel hoses and clamps. Contact Specialized Repair Activity (SRA). 4. Replace battery.  (WP 0139 00) 3 50 Operating Hours .2 Light Tower Engine 1. After the first 50 hours of operation, change the engine oil. (WP 0162 00)