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Pressurized Mating Adapter
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A Pressurized Mating Adapter (PMA) is a spacecraft adapter used on the International Space Station (ISS) to convert a Common Berthing Mechanism (CBM) interface to an APAS-95 docking port. Three PMAs are connected to the US Orbital Segment of ISS. PMA-1 and PMA-2 were launched with the Unity module in 1998 aboard STS-88; PMA-3 was launched in 2000 aboard STS-92. PMA-1 permanently connects the Unity and Zarya modules. IDA adapters have been installed on PMA-2 and PMA-3 which convert them to IDSS docking ports.
PMA-2 attached to the forward port of Destiny, where it was located between 2001 and 2007
PMA-2 attached to the forward port of Destiny, where it was located between 2001 and 2007
Expedition 58 crew member Anne McClain inside PMA-1, with the interior of Zarya in the background. PMA-1 has served as the bridge between Zarya and Un
Expedition 58 crew member Anne McClain inside PMA-1, with the interior of Zarya in the background. PMA-1 has served as the bridge between Zarya and Unity since the modules were berthed in 1998.
Androgynous Peripheral Attach System
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The terms Androgynous Peripheral Attach System (APAS), Androgynous Peripheral Assembly System (APAS) and Androgynous Peripheral Docking System (APDS) are used interchangeably to describe a Russian family of spacecraft docking mechanisms, and are also sometimes used as generic names for any docking system in that family. A system similar to APAS-89/95 is used by the Chinese Shenzhou spacecraft.
APAS-75 (American version)
APAS-75 (American version)
Drawing of a four-guide docking system that NASA proposed to the Soviets during a November 1971 meeting in Moscow
Drawing of a four-guide docking system that NASA proposed to the Soviets during a November 1971 meeting in Moscow
Passive
Passive
Passive (The geometry of the mating and latching features are still androgynous, but this variant is intended to reduce docking impact with additional
Passive (The geometry of the mating and latching features are still androgynous, but this variant is intended to reduce docking impact with additional position control on one side. either side can still be used together with either side, but mating two active sides would be unnecessary.)