The P1 and S1 trusses (also called the Port and Starboard Side Thermal Radiator Trusses) are attached to the S0 truss, and contain carts to transport the Canadarm2 and astronauts to worksites along the space station.
Nosníky P1 a S1 (označované ako Port and Starboard Side Thermal Radiator Trusses) sú pripojené k nosníku S0 a disponujú vozíkmi na prenos Canadarm2 a astronautov k pracovným miestam okolo vesmírnej stanice.