OO-M-2888
4.2.1 First article inspection. The first article inspection shall be performed on one mixer when a first article is required (see 3.2 and 6.2). This inspection shall include the examination of 4.3 and the tests of 4.4. The first article may be either a first production item or a standard production item from the suppliers current inventory, provided the item meets the requirements of the specification and is representative of the design, construction, and manufacturing technique applicable to the remaining mixers to be furnished under the contract.
4.2.2 Quality conformance inspection. The quality conformance inspection shall include the examination of 4.3 and the operational test of 4.4.1.
4.3 Examination. Each mixer shall be examined for compliance with the requirements specified in section 3 of this specification. Any redesign or modification of the contractor's standard product to comply with specified requirements, or any necessary redesign or modification following failure to meet specified requirements shall receive particular attention for adequacy and suitability. This element of inspection shall encompass all visual examinations and dimensional measurements. Noncompliance with any specified requirements or presence of one or more defects, preventing or lessening maximum efficiency, shall constitute cause for rejection.
4.4 Test. Failure to pass any test shall constitute cause for rejection.
4.4.1 Operational test. The empty mixer shall be operated for not less than thirty (30) minutes. Operation shall include actuation of all mixer's operating controls.
4.4.2 Water indicator accuracy test. Fill the water measuring tank using the supplied water pump and intake hose. Water source shall be lower than the pump inlet. The accuracy of the calibrated indicator shall be determined by discharging a measured quantity of water to the drum mixer. Use ten (10) different settings to cover the full range of the indicator. The discharged water for each setting, shall be collected and compared to the volume indicated by the indicator.
4.4.3 Concrete mixing test. The skip loader shall be filled with the manufacturer's recommended mix proportions of cement, sand and 1-inch (25mm) rock, to equal a full mixer load. The load shall be dumped into the drum and mixed with water, resulting in a completed mixture within 5 minutes of mixing time. This procedure shall be repeated 10 more times. The water measuring device shall be set to produce concrete with slump not to exceed 2 inches (51mm). The mix design shall be verified in accordance with ASTM C143 and C172.
4.4.4 Road test. The mixer shall be towed for 25 miles (40 km) on a public highway at speed of
35 mph (56 kph). The trailer shall not sway more than 3 inches (76 mm) on either side. The mixer shall be inspected for structural damage upon completion of test.
4.4.5 Lifting and tiedown attachments test. The mixer shall be lifted using the lifting and tiedown attachments. Check for structural damage after 10 minutes.
4.4.6 Test for electromagnetic interference suppression. This test shall be conducted in accordance with SAE J551 to verify conformance to 3.24.
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