What is line replacement unit?

A line replacement unit (LRU) is a device used in the maintenance of electronic systems and equipment, such as aircraft, automobiles, and telecommunications networks. The LRU is designed to enable the replacement of a single component or module of a system without having to replace the entire assembly, which can be time-consuming and expensive.

The LRU typically consists of a circuit board with connectors that can be easily inserted and removed from a system. During maintenance or repair, the faulty component is identified through testing or inspection, and then replaced with the appropriate LRU.

The use of LRUs enables faster and more cost-effective maintenance and repairs of electronic systems, as well as better uptime and system availability. They are a crucial part of many modern technologies and industries.