The present paper deals with a two-unit cold standby system with pre-i
nspection and two types of repairman-one regular and the other expert.
The regular repairman first inspects every unit that fails to ascerta
in whether he is able to repair it or not. If he can repair it, it is
alright, otherwise an expert repairman is called who comes immediately
. The system has been analysed to determine the various reliability me
asures by using semi-Markov and regeneration processes. Graphs are als
o plotted for a special case.