目前,典型民航机上装有约200个航空电子黑盒子(包括重复的和作为备份的).每个称为外场可更换部件(LRU)的黑盒子在飞机上执行一个特定的功能.每个LRU都包含带存储器的计算处理机、低压电源和输入/输出(I/O)电路.采用这种方案,为防止发生故障后失去飞行关键功能,就需在飞机上重复安装LRU,而实际上故障一般仅发生在LRU的小部件中,因而导致重量、体积和功率的浪费,增加费用. Currently, a typical civil aircraft is loaded with about 200 avionics black boxes (including duplicates and backups) Each black box, called a field replaceable unit (LRU), performs a specific function on an airplane Each LRU Include compute processors with memory, low-voltage power supplies, and input / output (I / O) circuits.Using this solution, LRU needs to be repeatedly installed on the aircraft to prevent loss of mission-critical functionality after a failure, while the actual failure Generally only occurs in the LRU’s widgets, resulting in a waste of weight, volume and power, increasing costs.