LEAK CHECK AND REMOVAL

Military Requirements for Petty Officer 2nd Class - index
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Figure 6-7.-Adjusting straps. 8. 9. 10. 11. 12. Tighten one temple strap (fig. 6-7) until the mask feels snug on that side. Tighten the other temple strap until both sides feel the same. (Tighten all straps toward the rear of the head with small jerks vice a long pull.) Run a finger under each temple tab front- to-back to check for snugness and to remove stray hair from sealing area. Grasp a neck strap in each hand and tighten. Grasp a forehead strap in each hand and tighten. Shake head quickly from side to side and up and down. Retighten mask straps as necessary. NOTE: In subsequent donnings, only the neck straps should need adjusting. LEAK CHECK AND REMOVAL. —You must check the mask for leaks when it is fitted and each time you put it on. A leaky mask will not protect you from toxic agents that can cause sickness or death. WARNING Do not hold a mask by its canister. An unscrewed canister is the most common cause of leaks. Use the following procedures to test for leaks 1. 2. 3. 4. 5. 6. Steady the mask and pull the external end of the drinking tube (a quick-disconnect coupling) out of the outlet valve cover. Grasp the outlet valve assembly with the thumb at the bottom and the forefinger at the top. Push the forefinger toward the mouth to get the internal end of the drinking tube between the teeth. Test the drinking tube for leaks by blowing into the tube. If resistance is not felt, the drinking tube is leaking; repair or get a replacement. Push the coupling firmly back into its socket. Make sure the canister is screwed in tight. Press the palm of the hand over the end of the canister. Breathe in until the lens collapses, Hold your breath for 10 seconds. If the lens remains collapsed, the mask is 6-15

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