to make room for the docking of a Multi-Purpose Logistics Module (MPLM). On August 30, 2007, PMA-3 was returned to the nadir port of Unity to make room for the temporary docking of the new Harmony (Node 2) module that was delivered by STS-120. Harmony was transferred to the forward port of Destiny, while PMA-3 was moved back to the port berthing mechanism of Unity on August 7, 2009, to accommodate reconfiguration of the Unity port bulkhead by crew members in a pressurized environment. On January 25, 2010, PMA-3 was moved from the port berthing mechanism of Unity to the zenith (space-facing) port of Harmony to make room for the new Tranquility (Node 3) module which was added to the station during STS-130. After activation of Tranquility, PMA-3 was moved again on February 16, 2010, to the port location on Tranquility where the Cupola observatory module had been docked for launch. PMA-3 was robotically removed from Tranquility on March 26, 2017, and attached to Harmony after being prepared during a successful spacewalk on March 24, 2017. A second spacewalk was conducted on March 30, 2017, to finalize the PMA-3 cable connections on Harmony. PMA-3 received International Docking Adapter-3 in August 2019. References External links YouTube animation Canadarm2 and Dextre move the PMA-3 between locations, one of the five times it was moved so that modules could use a Common Berthing Mechanism port instead of PMA-3. Components of the International Space Station