[2] STS-92 was an ISS assembly flight that brought the Z1 truss, Control Moment Gyros, Pressurized Mating Adapter-3 (PMA-3) (mounted on a Spacelab pallet) and two DDCU (Heat pipes) to the space station.

The mission included seven days of docked operations with the space station, four EVAs, and two ingress opportunities.

Over the course of four scheduled spacewalks, two teams of space walkers and an experienced robot arm operator collaborated to install the Z1 (Z for zenith port) truss structure on top of the U.S.

The Z1 fixture also served as the platform on which the huge U.S. solar arrays were mounted on the next shuttle assembly flight, STS-97.

During the fourth spacewalk, astronauts Wisoff and López-Alegría tested the SAFER jet backpack, flying up to 50 feet while remaining tethered to the spacecraft.