International Docking Adapter

The International Docking Adapter (IDA) is a spacecraft docking system adapter being developed to convert APAS-95 to the NASA Docking System (NDS)/ International Docking System Standard (IDSS). An IDA will be placed on each of the International Space Station's (ISS) two open Pressurized Mating Adapters (PMA), both of which will be connected to Node-2 (Harmony module).

Prior to IDA there were several different iterations of docking adapters that were meant to fill a similar role but were ultimately canceled.

The APAS to LIDS Adaptor System (ATLAS) was announced in 2008. It would have been placed on the open PMAs and converted APAS-95 to the Low Impact Docking System (LIDS). ATLAS was planned to be launched on Orion's first two missions to the International Space Station. Orion's missions to the ISS were later canceled altogether and its role as a crew transporter was replaced by the Commercial Crew Program.

The Common Docking Adapter (CDA) was announced in 2009. It was planned to be used to convert the Common Berthing Mechanism to the NASA Docking System. The CDAs would have been attached directly to Node-2 forward and Node-2 zenith. They would have been delivered on the Japanese HTV cargo spacecraft.

IDA converts APAS-95 to the NASA Docking System (which complies with the International Docking System Standard) and allows the transfer of crew, cargo, power and data. IDA has a mass of 526 kg (1,160 lb), a height of 110 cm (42 in) and a width of 160 cm (63 in). When including the docking targets, laser retro-reflectors and related systems that are arrayed around the outer perimeters, the outer diameter is about 240 cm (94 in).

Boeing is the primary contractor for the IDAs and the adapters were assembled at their Houston Product Support Center. Parts from subcontractors came from 25 American states and the primary structure is from Russian company RSC Energia.

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