TM 10-4520-261-12&P SPACE HEATER ARCTIC (SHA) PREVENTIVE MAINTENANCE CHECK AND SERVICES (PMCS)   0010 00 0010 00-5 THIS SECTION COVERS: Before Operation PMCS Checks and Services INITIAL SETUP: SHA Shutdown and Cool Maintenance Level Materials Operator Wiping Rags (WP0046, Table 1, Item 1) Table 1. Preventive Maintenance Checks and Services for SHA - continued ITEM NO. INTERVAL ITEM TO BE CHECKED OR SERVICED PROCEDURE EQUIPMENT NOT READY/ AVAILABLE IF: WHEN OPERATING WITH LIQUID FUEL... 5 Before Burner shell assembly   Check down tube assembly (1) and inside of burner shell assembly (2) for thick carbon/soot deposits.  Clean if necessary.  Check both assemblies, (1) and (2), for cracked metal. Down tube assembly is cracked or plugged and/or burner assembly holes are blocked. 6 Before Fuel flow control valve   Check for bent/damaged bracket (3), fuel flow control valve (4), cup/cable assembly (5).  Be sure bracket (3) is not bent out of the required 90 degree position from the heater body assembly (6). Valve is damaged or valve bracket bent out of 90 degree position with heater body. 7 Before Fuel hoses   Check for cuts or swollen areas in hose (7) walls or damaged fittings (8). Hoses are cut or have swollen areas, or fittings are damaged. 8 Before Fuel can stand, fuel can Check fuel can stand (9) and fuel can (10)  for damage. Fuel can stand is unstable; fuel can leaks. 9 Before Gravity feed adaptor Check gravity feed adaptor (11) for damage. Ensure that the gasket (12) inside the cap has been installed. Check the QD fitting (13) for dirt, ice, or other foreign objects; clean if necessary. Check hose (14) for cracks or damaged areas. Gravity feed adaptor leaks. WHEN OPERATING WITH SOLID FUEL... 10 Before Solid fuel grate   Check that solid fuel grate (15) is not bent or otherwise damaged. Solid fuel grate is bent such that it allows fuel to touch bottom. 11 Before Sliding draft gate Check that sliding draft gate (16) opens and shuts completely, and that when shut, it forms a tight seal. Sliding draft gate will not fully shut, or does not open.