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Line-replaceable unit
A line-replaceable unit (LRU〔() 〕), lower line-replaceable unit(LLRU), line-replaceable component (LRC), or line-replaceable item (LRI)〔(Australian Government Civil Aviation Safety Authority, Aviation abbreviations and acronyms, Retrieved 11 July 2013 )〕 is a modular component of an airplane,〔(A comparative evaluation of the reliability improvement in line replaceable unit )〕 ship or spacecraft〔(Welcome to IEEE Xplore 2.0: Line Replaceable Unit (LRU) Analysis in the Space Shuttle Orbiter Electrical Power System )〕 (or any other manufactured device) 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. LRUs are typically assigned logistics control numbers (LCNs) or work unit codes (WUCs) to manage logistics operations.
LRUs improve maintenance operations, because they can be stocked and replaced quickly from on-site inventory, restoring the system to service, while the failed (unserviceable) LRU is undergoing maintenance. Because they are modular, they also reduce system costs and increase quality, by centralizing development across different models of vehicles.〔(A Cost Trade-Off Analysis of F-16 Line Replaceable Unit (LRU) Packaging Options )〕
== Definition ==
While the term LRU has been in use for decades, MIL-PRF-49506, Notice 1 of 18 Jan 05, the Performance Spec for Logistics Management Information defines an LRU as:
An LRU is an essential support item which is removed and replaced at the field level to restore the end item to an operational ready condition. Conversely, a non-LRU is a part, component, or assembly used in the repair of an LRU / LLRU, when the LRU has failed and has been removed from the end item for repair.
An LLRU is part of an LRU, and which can be removed and replaced at the field level to restore its LRU to an operational ready condition. As an LRU is considered the 'parent', the LLRU is considered a 'child'. An LLRU can also be a child of a child--that is, an LLRU being a component of a higher-level LLRU. However, there is no hierarchy difference between child levels; the only hierarchical separation is parent versus child.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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