NASA Docking System
The NASA Docking System (NDS) is a spacecraft docking and berthing mechanism for US human spaceflight vehicles, such as the Orion spacecraft and the Commercial Crew vehicles Dragon and Starliner. The NDS is NASA's implementation of the International Docking System Standard (IDSS), an attempt by the International Space Station Multilateral Coordination Board (MCB) to create an international spacecraft docking standard. The international Low Impact Docking System (iLIDS) is the precursor to the NDS. The NDS Block 1, was designed and built by The Boeing Company in Houston, TX, to meet the IDSS standards. Design qualification testing took place through January 2017.

NASA has developed the International Docking Adapter in order to convert the older APAS-95 docking system used on ISS Pressurized Mating Adapters to the NASA Docking System. The first IDA, IDA-1 was originally scheduled to be attached to PMA-2, located on the forward hatch on Node 2, and IDA-2 was to be attached to PMA-3, on the zenith hatch on Node 2. IDA-2 was rescheduled to be attached to PMA-2 after IDA-1 was destroyed. It was delivered successfully on SpaceX's CRS-9 mission in July 2016, and then installed on PMA-2 in August of that year during a spacewalk by Jeffrey Williams and Kathleen Rubins as part of Expedition 48. IDA-3 started construction after IDA-1 was destroyed, and was made mainly from spare parts in order to speed up its construction. IDA-3 was delivered on SpaceX CRS-18 on July 25, 2019, and was installed a month later on August 21st by NASA astronauts Nick Hague and Andrew Morgan as part of Expedition 60.
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