S91-27784 (5 Nov 1990) --- STS-39 Discovery, Orbiter Vehicle (OV) 103, Infrared Background Signature Survey (IBSS) Shuttle Pallet Satellite (SPAS) II documented during preflight processing procedures. German Messerschmitt-Bolkow-Blohm (MBB) technicians work on SPAS II cryostat (without insulation) and other elements at the Cape Canaveral Air Force Station, 11/05/90