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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).
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.
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.
Transferred Orbital Replacement Units (ORUs) from the Shuttle Integrated Cargo Carrier (ICC) to the External Stowage Platform-3 . Transferred materials included a spare high-gain antenna, cooling-system pump module and spare parts for the Mobile Servicing System. JEF Visual Equipment (JEF-VE) installation on the forward section was postponed ...
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.
Hubble was designed to accommodate regular servicing and equipment upgrades while in orbit. Instruments and limited life items were designed as orbital replacement units. [105] Five servicing missions (SM 1, 2, 3A, 3B, and 4) were flown by NASA Space Shuttles, the first in December 1993 and the last in May 2009. [106]
Heat Collection - Each Loop draws heat from five Heat Exchangers (HXs) mounted on the Destiny Laboratory, Node-2 & Node-3 as well as cold plates under three DC-to-DC Conversion Units (DDCUs) (one DDCU each on each Loop on the P1/S1 Trusses and two DDCUs each on each Loop on the S0 Truss) and two Main Bus Switching Units (MBSUs) on each Loop on ...
The unpressurised component is composed of two external station experiments, Atmosphere-Space Interactions Monitor (ASIM) and Materials ISS Experiment Flight Facility (MISSE-FF), and a Pump and Flow Control Subassembly (PFCS) orbital replacement unit for the station. [7] [10]