ZZ-H-617C
4.2.2.3 Nonconformance of sampling tests. If one or more defects are found in the inspection sample, both the qualifying and inspection activities shall be immediately notified and the production lot shall be rejected and not be supplied to this specification. Acceptance and shipment of the product shall be discontinued until corrective action, acceptable to the qualifying activity, has been taken. The corrective measures shall be performed on the materials or processes, or both, as warranted, and on all products considered
subjected to the same failure. Once the corrective action has been completed, either the specific sampling test in which the original sample failed or all sampling tests may be required to be repeated on additional samples, at the option of the qualifying activity. However, final acceptance shall be withheld until testing
has shown that the corrective action was successful. In the event of a failure after re-inspection, information concerning the failure and the corrective action taken shall be furnished to both the qualifying and inspection activities.
4.2.3 Disposition of test samples. Samples that have been subjected to any sampling tests are considered damaged and shall not be delivered as part of a contract or purchase order.
4.2.4 Discontinuation and resumption of production. If there has been no production of a specific size for a period of three years or more, eight samples shall be randomly selected from the first lot produced when production of that size has resumed and be subjected to the sampling tests (see table IV).
4.3 Inspection conditions. Unless otherwise specified, all required inspections shall be performed in accordance with the test conditions specified in 4.4.
4.4 Test methods. Unless otherwise specified, tests shall be conducted at an ambient air temperature of
80 9 °F and test specimens shall be conditioned to this temperature prior to testing.
4.4.1 Examination of product. Each length of hose shall be visually and physically examined for conformance to the following requirements:
a. Construction (see 3.2). b. Dimensions (see 3.3). c. Marking (see 3.5).
d. Workmanship (see 3.7).
4.4.2 Burst pressure. An 18-inch length of hose shall be tested in accordance with ASTM D380 (straight or curved bursting test). The hose shall meet the requirements specified in 3.4.1.
4.4.3 Vacuum resistance. The ends of a 12-inch length of hose shall be fitted with couplings. One end shall be closed or sealed to prevent leakage of air and the other end shall be connected to a vacuum pump. The outside diameter of the hose shall be measured and recorded. The hose shall be curved to a radius equal to five times its maximum outside diameter and shall be subjected to a vacuum of 24 inches of mercury. After a period of 5 minutes and with the vacuum maintained, the outside diameter shall again be measured and the hose inspected. (Separation of the inner tube from the reinforcement may be determined by sectioning the hose lengthwise.) Requirements shall be as specified in 3.4.2.
4.4.4 Flexibility. A rod shall be inserted into each end of a 4-inch length of hose of full circumference. The rod ends shall be perpendicular to the axial length within 3 and the depth of insertion shall be as specified in table V. The hose shall then be bent until the rods form a 90 angle. Requirements shall be as specified in 3.4.3.
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