STS-100

The highest priority objectives of the flight were the installation, activation and checkout of the Canadarm2 robotic arm on the station. The arm, which went into operation on April 28, 2001, was critical to the capability to continue assembly of the International Space Station.[3] The arm was also necessary to attach a new airlock to the station on the subsequent shuttle flight, mission STS-104. A final component of the Canadarm is the Mobile Base System (MBS), installed on board the station during the STS-111 flight.