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Table 4-3.PRK-37/P Helmet Shell Sizing Guide
OXYGEN MASKS

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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INSPECTIONS Visual Inspection There is one basic inspection that you must perform on the helmet—the calendar inspection. In addition, the aircrew member is responsible for a preflight/postflight inspection before and after each flight. Calendar Inspection The calendar inspection is conducted by organizational-level activities upon issue and every 90 days thereafter. The 90-day inspection consists of a visual inspection, functional check, and a thorough cleaning. NOTE: Every other calendar inspection, or every 180 days, the chin strap, nape strap pad, ear seals, and skull cap must be To visually inspect the helmet, you must make a thorough sight inspection for broken parts, security of attached parts, loose or broken stitchings, and also inspect the earcups for sound attenuation and pliability. Functional Check The functional check is performed with the aid of a REDAR oxygen hose test set. If this unit is not available, standard shop procedures should be performed. Refer to NAVAIR 17-15BC-7 for the proper testing sequence. SPH-3C HELMET The SPH-3C helmet, shown in figure 4-16, is designated for use by all helicopter aircrew replaced. members. Figure 4-16.—SPH-3c protective helmet. 4-23







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