While indonesia has good effort of modernization in the naval forces, why there is an extreme spends on such an old ships ? I even confront that Turkey modernized G-class AAW frigates ,but there wasnt any class to replace till 2020s , also it is still about 30 years old which is a limit by NATO for operated ships.
They are almost 50 years old , it doesnt matter what you install on those ships ,overhauling a system after 30 years isnt cost effective ,if there is a modernization projected for this class, how many years it is supposed to be in operation (Think a basic Cost/year assumption) ? The cost of overhauling during years after 30-35 , or a massive project to modernize them with modern equipment will cost almost as a new system.
Very bulky design from 60s , Not effective cannon, Excess ratio of hull weight/equipment , Large RCS ,Less survivability.
It is more logical to basically build/ purchase new platforms, even a corvette sized ship can replace these old ships . They should have been decommissioned when there is need to change engines ,Sorry but who really thought to modernize them in this way isnt a professional anyway . It is mostly to sustain production for the company's economical wheel.
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Here is list /commission.