13-12] 



MAINTENANCE AND INSTALLATION 



713 



permitting the subassembly to plug into a mating connector on a major 

 assembly. Fasteners and guide pins protect the electrical connector from 

 mechanical loads. If a plug-in subassembly fails, it can be replaced with a 

 spare quickly and easily. Fig. 13-12 illustrates a computer system designed 

 to use plug-in units extensively. 



Fig. 13-12 Airborne Computer, Illustrating the Use of Plug-in Units. 



The size and complexity of plug-in subassemblies may be governed in 

 part by maintenance considerations. When a failure occurs on a radar, it is 

 usually rather difficult to locate the particular component or components at 

 fault, regardless of accessibility. On the other hand, it is comparatively 



