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Purpose of EEI was to uncover any interference between GLV electrical and electronic systems. In the second EEI (August 2), five systems were found to produce unacceptable interference. Two systems still did not meet specification in the third EEI (August 10), but all interference problems were eliminated in the fourth (August 20). After modification of the flight control system, a fifth EEI revealed minor interference (September 3), all of which was cleared up in the final test on September 5. Problems were resolved by adding filters and grounds to aerospace ground equipment and airborne circuits. EEI tests were performed in conjunction with Combined Systems Tests, which began August 2.