AKA: Service Module. Status: Study 1987. Gross mass: 796 kg (1,754 lb). Height: 1.00 m (3.20 ft). Diameter: 4.00 m (13.10 ft).
Structure: 214 kg (471 lb). Heat shield: 64 kg (141 lb). Reaction Control System: 70 kg (154 lb). Navigation Equipment: 5.00 kg (11.00 lb). Electrical Equipment: 80 kg (176 lb). Communications Systems: 175 kg (385 lb). Miscellaneous Contingency: 108 kg (238 lb). Environmental Control System: 80 kg (176 lb).