Second Axial Carrier, specially designed shuttle pallet that flew on Hubble space telescope servicing flights. It carried cameras, instruments, and spare materials used in servicing Hubble.
AKA: SAC. Status: Operational 1993. First Launch: 1993-12-02. Last Launch: 1997-02-11. Number: 2 . Apogee: 618 km (384 mi).