Downloaded from https://www.everyspec.com MIL-STD-81OC 10 March 1975 (7) Deterioration, corrosion, or change in tolerance limits of any inter- nal or external parts which could in any manner prevent the test item from meeting operational service or maintenance requirements. b. Any additional”or different failure criteria shall be as specified in the equipment specification. 3.3 Test facilities and apparatus. Test facilities, chambers, and apparatus used in conducting the tests contained in this standard shall be capable of meeting the conditions required. 3.3.1 Test chamber 3.3.1.1 Volume of test chamber.
The volume of the test chamber shall be such that the bulk of the item under test will not interfere with the generation and maintenance,, of,the test conditions. W@ testing multiPle sample items simultaneously,the test chamber shall be of sufficient size so that each test unit is provided uniform environmentalconditions and is not subjected to nontest environments. 3.3.1.2 Heat source. The heat source of the test facility shall be so located that radiant heat from the source will not fall directly on the test item, except where application of radiant heat is one of the test conditions. 3.3.1.3 Location of temperature sensors.
Unless otherwise specified, thermocouples or equivalent temperature sensors utilized to determine or control the specified chamber temperature shall be located centrally within the chamber, in the supply airstream, or in the return airstream whichever provides,the specified test conditions at the bulk under test and shall be baffled or otherwise protected against radiation effects. 3.3.1.4 Internal air circulation. The conditioned air flow shal1 be suitably baffled to provide uniform air flow around the test item. If multiple test items are tested, they shall be so spaced as to provide free circulation between the test items and the chamber walls. 3.4 Test data.
Test data shill include complete identificationof all test equipment and accessories. The data shall include the actual test sequence used and ambient test conditions recorded”periodically during the test period.”.The test record shal1 contain a signature and date block for certification of the test data by the test engineer. 4. TEST SEQUENCE 4.1 See table I for recommended test sequence. B 7 -,.