the base of the fairing volume. ASAPs are used for LEO polar missions but it is also possible to use it for launches into GTO missions. Ariane 4 - Ultra Short Spelda (USS) SPELDA (Structure Porteuse Exteme Lancement Double Ariane I Ariane dual launch external bearing structure) has been developed to have a dual launch system on Ariane 4. This carbon fiber structure surrounds the inner spacecraft and supports the upper spacecraft and the fairing. There are three sizes: long, short and now ultra short. The USS can be used to launch one small secondary payload into GTO or polar orbit with a 400 to 800 kg mass. Eureca Platform Eureca (European REtrievable CArrier) is a multi-disciplinary platform that is launched on US Shuttle mission (first one in 1992), left to function autonomously for six to nine months, and then is recovered by a later Shuttle. The mass available to payload is 1000 kg with a volume of 8.5 m3SpaceLab SpaceLab was built as the European contribution to the US Space Shuttle program and consists of a pressurized module and an unpressurized pallet structure. This structure is fixed in the US Shuttle cargo bay and can be used to expose payloads (about 100 kg) to the space environment. SpaceHab SpaceHab is a pressurized module integrated into the Shuttle bay and can be configured to hold up 72 mid-deck lockers (capacity of 27 kg).
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