Operator Preventive Maintenance Checks and Services (Cont)

TM 5-4220-225-14 Table 2-1. Operator Preventive Maintenance Checks and Services (Cont). 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 HELMET ASSEMBLY (Cont) b. Inspect the viewports for proper assembly and for Inspection reveals any of the loose or missing screws: defects sighted above or any defect that renders the helmet inoperable. 4. Breech Rings and Locking Devices. a. Inspect the helmet breech ring, lower breech ring assembly, and locking devices for dirt, corrosion, and loose or missing screws. b. Inspect the breech rings and locking devices for proper mating. Ensure the locking devices operate freely and lock positively. c. Inspect preformed packing for cuts, nicks and deterioration. Replace if required. Apply a light film of lubricant. d. Inspect the installed neckdams and drysuit butyl Inspection reveals any of the rubber neckpieces for deterioration and cuts or defects sighted above or tears. Repair or replace if required. any defect that renders the helmet inoperable. 5. Adapters. a. Inspect the air adapter, mixed gas adapters, and communication adapter for corrosion, dirt, and loose or missing screws. b. Inspect adapter cap seal preformed packing and Inspection reveals any of the gaskets for cuts, nicks, and deterioration. Replace defects sighted above or if required. Lightly lubricate. any defect that renders the helmet inoperable. 2-6