Operator Preventive Maintenance Checks and Services (Cont)

TM 5-4220-225-14 Table 2-1. Operator Preventive Maintenance Checks and Services (Cont). Interval Item Item to be Inspected. Equipment Will Be No. B D A Q Procedure Reported Not Ready If UMBILICAL HOSE/AIR SUPPLY WHIP ASSEMBLIES (Cont) 27. Communications/Strength Cable. • • Inspect for damaged fittings, corrosion, verdigris, Inspection reveals any of the and the condition of the outer cover, especially for defects sighted above or blisters. Notify you supervisor if damage is found. any defect that renders the helmet inoperable. 28. Pneumofathometer Hose. • • a. Inspect the hose assembly for wear and deterioration. • • b. Inspect coupling for deterioration, damage, corrosion, and verdigris. NOTE Perform annually or as often as required. • • c. Inspect for blisters, cuts, and abrasions. Inspection reveals any of the defects sighted above or any defect that renders the helmet inoperable. 2-8. Test Procedures. These procedures require the use of the MK12 SSDS Test Set. Only diver's compressed air will be utilized with the test set. A schematic diagram of the test set with a valve lineup matrix is shown in figure 2-3. Procedures should be performed in the step-by-step sequence listed to avoid errors and prevent damage. Each test is written as an independent function for the purpose of testing, following PMCS procedures. During predive testing, transition from one test to another may be simplified by skipping those steps marked with an asterisk (*). All tests are to be performed daily during predive procedures with the exception of the relief valve test, and the drysuit leak test. These are permission functions but will be accomplished as often as the diver supervisor deems necessary. For example, as new suits are brought to the dive station or after repairs have been effected due to damage incurred during previous dives. a. Vacuum Test of the One Way Valve (figure 2-2). (1) Remove protective cap and gasket from helmet air supply adapter. (2) Connect air whip (1) to helmet air supply adapter (2) and other end to adapter (3). 2-15