Downloaded from https://www.everyspec.com 1 IL-STO-810C 10 March 1975 k’equirementfor operation following installationof the test item in the test facility is applicable only when operation is required during exposure to the specified test. 3.2.3 Performance check during test. When operation of the test item is required during the test exposure, suitable tests shall be performed to determine whether the test exposure is producing changes in performance when compared with pretest data. 3.2.4 Post-test data.
At the completion of each environmental test, the test item shall be inspected in accordance with the equipment specification snd the results shall be compared with the pretest data obtained in accord- ance with 3.2.1. 3.2.5 Test data. Test data shall include complete identificationof all test equipment and accessories. The data shal1 include the actual test’ sequence used and ambient test conditions recorded periodically during the test period. The test record shall contain a signature and data block for certification of the test data by the test engineer. 3.2.6 Failure criteria a. The item shal1 have failed the test when any of the following occur:
(1) Monitored functional parameters deviate beyond acceptable limits established in 3.2.1. (2) Catastrophic or structural failure. (3) Mechanical binding or loose parts, including screws, clamps, bolts, and nuts, that clearly result in component failure or a hazard to personnel safety. (4) Malfunction. (5) Degradation of performance beyond pretest record or equipment speci- fication requirements established in 3.2.1 (record to be made after test). NOTE: Certain types of equipment (e.g., propellants and electrically driven devices) are often expected to demonstrate lesser performance at an environ- mental extreme, particularly low temperature.
A failurewould occur only if degradation is more than expected. (6) Any additional deviations from acceptable criteria established before the test and recorded according to 3.2.1. 6