MIL-M-27274E(USAF)
3.4.9 Dust cover. The mask shall be equipped with a dust cover to prevent dust, dirt, and foreign objects from entering the mask cavity when the mask is not in use. The cover shall be made of durable, nonbrittle, lightweight plastic material contoured to rest around the face edge of the hardshell and to be retained on the hardshell with an elastic webbing around the front edge of the hardshell at the
microphone contour. The configuration of the cover shall conform to 64D1676. The cover shall not rest on the face piece contour between the seal area and the body of the facepiece.
3.5 Performance.
3.5.1 Mask leakage. The inboard leakage shall not exceed 100 milliliters per minute when tested (see
4.6.2).
3.5.2 Combination valve installation, inlet performance (low suction). The total leakage through the combination valve inlet portion shall be 15 milliliter per minute or less when tested (see 4.6.3).
3.5.3 Combination valve installation, inlet performance (high suction). The total leakage through the combination valve inlet portion shall be 150 milliliters per minute or less when tested (see 4.6.4).
3.5.4 Combination valve installation, exhalation performance. A pressure of 20 millimeters of mercury in the facepiece and a pressure between 15 and 19.9 millimeters of mercury in the inlet tubing shall cause the exhalation portion of the valve to open when tested (see 4.6.5).
3.5.5 Combination valve installation, exhalation resistance. The exhalation resistance shall not be greater than 4.67 millimeters of mercury with a flow of 100 liters per minute when tested (see 4.6.6).
3.5.6 Delivery tube leakage. The delivery tube shall not leak when subjected to an internal air pressure of five pounds per square (see 4.6.7).
3.5. 7 Delivery tube strength. The delivery tube shall not tear or separate when tested (see 4.6.8).
3.5.8 Tear resistance. The silicone rubber shall have a minimum tear resistance of 150 pounds per inch when tested (see 4.6.9).
3.5.9 Hardness. The Shore-A-Durometer hardness of the silicone rubber shall be 45 5 when tested
(see 4.6.10).
3.5.10 Toxicity. The silicone rubber shall not contain any chemicals or materials that have toxic properties (see 4.6.11).
3 .5.11 Subjective use. The silicone rubber shall not produce any objectionable odors, shall not be tacky, and shall not have any other properties that cause discomfort or affect wear ability. The mask shall have no detrimental or objectionable performance characteristics when evaluated (see 4.6.12).
3.5.12 Hardshell flexibility. The mask hardshell shall withstand a decrease in width (as measured by dimension B of figure 2) of 1 1/2 inches without visible cracking or fracture when subjected to compressive loading (see 4.6.13).
3.6 Color. The color of the hardshell, webbing, and all silicone rubber used in the oxygen mask assembly shall be green, approximately matching color number 34079 conforming to FED-STD-595.
3. 7 Interchangeability. All parts having the same manufacturer's part number shall be functionally and dimensionally interchangeable. The drawing number requirements of MIL-STD-100 shall govern the manufacturer's part numbers and changes thereto.
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