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PMA 1, 2, 3


The PMA (Pressurized Mating Adapter) are elements to connect the 1.3 m US CBM (Common Berthing Mechanism) interface to the russian 0.7m APAS (Androgynous Peripheral Attachment System) docking systems. Three PMAs are untilised at the ISS - one for connecting the russian with the american segment and two to allow dockings of the Shuttle and later Orion spacrafts.

PMA 1 connects permanently the aft hatch of Node 1 with the Zarya module.

PMA 2 was delivered with Node 1 and was located at first at the forward hatch of this module. When STS-98 delivered Destiny, PMA 2 was moved to the forward hatch of Destiny. When STS-120 delivers the Node 2 to its temporary berthing at the port hatch of Node 2, PMA 2 will first be moved to the front hatch of Node 2 and then with this module to the front hatch of Destiny.

PMA 3 was delivered on a Spacelab pallet by STS-92. First docked at the nadir hatch of Node 1, it provided docking for the STS-97 and STS-98. In March 2001 it was moved to the port hatch of Node 1. In Augus 2007 PMA-3 moved to the nadir hatch of Unity to make room for the temporary docking of the Node 2 module delivered by STS-120. For adding Node 3, it will temorary move to the nadir port of Node 2. Finally it will be docked to the nadir hatch of Node 3 when this will be berthed to Node 1 in 2010.

Node 2 and Node 3 will be fitted with the adaptors IDA 2 and 3 respectively (IDA 1 was lost) in 2015/16 to enable the new Starliner (CST-100) and Dragon-2 manned capsules to dock with the ISS.

Nation: USA
Type / Application: Space station adaptor module
Operator: NASA
Contractors: Boeing
Equipment: ?
Propulsion: None
Mass: 1600 kg (#1); 1200 kg (#3)
Orbit: 400 km × 400 km, 51.6 (typical)
Satellite COSPAR Date LS Launch Vehicle Remarks
PMA 1 N/A 04.12.1998 CC LC-39A Shuttle with Endeavour F13 (STS 88), Node 1, PMA 2, Mightysat 1, SAC A
PMA 2 N/A 04.12.1998 CC LC-39A Shuttle with Endeavour F13 (STS 88), Node 1, PMA 1, Mightysat 1, SAC A
PMA 3 N/A 11.10.2000 CC LC-39A Shuttle with Discovery F-28 (STS-92), ITS-Z1