Performs orbital checkout and setup of Zvezda module. ITS Z1 is an early exterior framework to allow first U.S. solar arrays on flight 4A to be temporarily installed on Unity for early power. Rationale Ku-band communications system . Ku-band communication system supports early science capability and U.S. television on 5A.1. Provides Russian assured crew return capability without the Space Shuttle present.
Station begins permanent human presence.
Endeavour Integrated Truss Structure P6 . Photovoltaic Module . First PV module installed temporarily on Z1 truss until after flight 13A when it can be moved to the P5 truss segment. Also, S-band communications system is activated for voice and telemetry. Atlantis U.S. Destiny Laboratory Module .