Orbit Replaceable Unit
Encyclopedia
An Orbital Replaceable Unit is a modular component
of spacecraft that can be replaced upon failure by a robot or by an Extra-Vehicular Activity
. The Hubble Space Telescope
was designed with 70 such parts. The electrical system of the International Space Station
also has such subsystems that provide power generation, power distribution and energy storage.
Line-replaceable unit
A line-replaceable unit is a modular component of an airplane, ship or spacecraft that is designed to be replaced quickly at an operating location. An LRU is usually a sealed unit such as a radio or other auxiliary equipment...
of spacecraft that can be replaced upon failure by a robot or by an Extra-Vehicular Activity
Extra-vehicular activity
Extra-vehicular activity is work done by an astronaut away from the Earth, and outside of a spacecraft. The term most commonly applies to an EVA made outside a craft orbiting Earth , but also applies to an EVA made on the surface of the Moon...
. The Hubble Space Telescope
Hubble Space Telescope
The Hubble Space Telescope is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation. A 2.4 meter aperture telescope in low Earth orbit, Hubble's four main instruments observe in the near ultraviolet, visible, and near infrared...
was designed with 70 such parts. The electrical system of the International Space Station
Electrical system of the International Space Station
The electrical system of the International Space Station is a critical resource for the International Space Station because it allows the crew to live comfortably, to safely operate the station, and to perform scientific experiments. The ISS electrical system uses solar cells to directly convert...
also has such subsystems that provide power generation, power distribution and energy storage.