MIL-M-27274E(USAF)
3.8 Identification of product. The mask assembly shall be marked with the following specific information conforming to MIL-STD-130. The Federal Stock Number shall be omitted from the nameplate.
Mask, Oxygen: MBU-5/P Mask Size: M27274-* Manufacturer: *
Date of Manufacture: (Quarter and Year)*
3.8.1 Tubing. The mask end of the tubing shall be identified by molding "Mask End" into the rubber. The date of manufacture (quarter and year) shall be molded on either end of the tubing.
3.9 Workmanship. The mask shall be constructed in accordance with good commercial practice, and shall be free from any defects which might affect appearance or function. The mask shall be clean and dry, free from oil, grease, and other foreign matter. All metal and plastic parts shall be smooth and free of sharp edges. All excess flash shall be properly trimmed. The facepiece and its related parts shall be smooth and free from blisters, porous areas, cracks, abrasions, bubbles, and foreign material.
3.10 Reclaimed materials. The use of reclaimed materials shall be encouraged to the maximum extent possible.
4. QUALITY ASSURANCE PROVISIONS.
4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractor's overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material.
4.2 Classification of inspection. The inspection requirements specified herein are classified as follows:
a. First article inspection (see 4.4).
b. Quality conformance inspection (see 4.5).
4.3 Inspection conditions.
4.3.1 Atmospheric conditions. Unless otherwise specified, all tests required by this specification shall be made at an atmospheric pressure of 28 to 32 inches of mercury, at a temperature of 77 18 F, and at a relative humidity of 80 percent or less. Where tests are made with atmospheric pressure or temperature substantially different from these values, proper allowance shall be made for the change instrument reading.
4.3.2 Gas. The gas used in testing shall be oxygen conforming to type I of MIL-O-27210. The gas used in all other testing shall be oxygen conforming to type I of MIL-O-27210, water pumped nitrogen conforming to type I, class 1, grade B of BB-N-411, or compressed air conforming to grade A or C of BB-A-1034. If nitrogen or air is used, appropriate density correction factors shall be applied to the flow meter used.
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