Table 2-1. Operator Preventive Maintenance Checks and Services

TM 5-4220-225-14 Table 2-1. Operator Preventive Maintenance Checks and Services. NOTE Within designated intervals, these checks are to be performed in the order listed. If the equipment must be kept in continuous operation, check and service only those items that can be checked and serviced without disturbing operation. Make the complete checks and services when the equipment can be shut down. B - Before D - During A - After Q - Quarterly Interval Item Item to be Inspected. Equipment Will Be No. B D A Q Procedure Reported Not Ready If NOTE Perform quarterly planned maintenance when helmet is stowed for prolonged periods. HELMET ASSEMBLY 1. Exterior. Visually inspect to ensure all components and parts are properly installed and in good condition. 2. Shell and Base. a. Inspect the shell and base for dirt, corrosion, dents, cracks or chips, and sealant deterioration. b. Visually inspect for loose or missing base-to-shell Inspection reveals any of the mounting screws. defects sighted above or any defect that renders the helmet inoperable. 3. Viewport Assemblies. a. Inspect the viewports for scratches, chips and A scratch 1/32-inch deep cracks. Smaller scratches do not constitute a and more than 1-inch long safety hazard but may obscure vision. If on the requires replacement of inside surface, it can be reversed and continued viewport. If both surfaces in use. Switching the left and right viewports will are marred so that vision is reverse these surfaces. obscured, replace the view- port. If the viewport is cracked or chipped any- where, replace it. 2-5