STS111-E-5226 (11 June 2002) --- Astronaut Franklin R. Chang-Diaz, STS-111 mission specialist, participates in the second scheduled session of extravehicular activity (EVA) for the STS-111 mission. During the 5-hour spacewalk, Chang-Diaz and Perrin completed installation of the Mobile Remote Servicer Base System (MBS) on the International Space Station�s (ISS) railcar, the Mobile Transporter.