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Orbital replacement units are parts of the main systems and subsystems of the external elements of the ISS. Affecting the control of the cooling system, the movement and control of the solar arrays and SARJ as well as the flow of power throughout the station from solar arrays to the heat rejection system as part of the External Active Thermal Control System (EATCS).
ESP-3 framework. External stowage platforms (ESPs) are key components of the International Space Station (ISS). Each platform is made from steel [citation needed] and serves as an external pallet that can hold spare parts, also known as orbital replacement units (ORUs), for the space station.
An orbital replacement unit or orbital replaceable unit is a modular component of spacecraft that can be replaced upon failure either by robot or by extravehicular activity. The Hubble Space Telescope (HST) was designed with 70 such parts, [ 1 ] including scientific instruments and limited-life items such as batteries.
The first is the Payload/Orbital Replacement Unit Accommodations (POA). This is a device that looks and functions much like the Latching End Effectors of Canadarm2. It can be used to park, power and command any payload with a grapple fixture, while keeping Canadarm2 free to do something else.
ExPRESS Logistics Carrier number 1. An EXpedite the PRocessing of Experiments to Space Station (ExPRESS) Logistics Carrier (ELC) is an unpressurized attached payload platform for the International Space Station (ISS) that provides mechanical mounting surfaces, electrical power, and command and data handling services for Orbital Replacement Units (ORUs) as well as science experiments on the ISS.
The Latchable Grapple Fixture (LGF) allows for grappling and latching, intended to be used for longer‐term stowage on the Payload Orbital replacement unit Accommodation (POA) (greater than 3 weeks). [4] It does not have any electrical connectors. [4]
ISS External Active Thermal Control System (EATCS) diagram Early Ammonia Servicer DDCU cold plate design. The International Space Station (ISS) External Active Thermal Control System (EATCS) [1] maintains an equilibrium when the ISS environment or heat loads exceed the capabilities of the Passive Thermal Control System (PTCS).
The Exposed Facility (EF), also known as "Terrace", is located outside the port cone of the PM (which is equipped with an airlock). The EF has twelve Exposed Facility Unit (EFU) ports which attach to Payload Interface Unit (PIU) connectors on EF-equipment exchange units (EF-EEUs). All experiment payloads are fully exposed to the space environment.