After finally achieving hard-dock and jettisoning of the Kvant-FSM, tests of the onboard systems of Kvant-1 were conducted until the end of April. May was spent in preparation for the extension of the electrical power with activities which required little electricity, like medical experiments and Earth resources photography – much-needed additional electrical power would enable experiments like the Korund 1-M kiln, which was used to conduct melts lasting several days, and to power Kvant-1's gyrodines, needed for astronomical observations. For this, Kvant had carried stowed solar arrays, which were attached to the Mir base block during an EVA on June 12.