If spares available and proper maintenance carried out a airframe in theory could be kept flying indefinitely. Eg US B-52s and CH-53s.
However it gets economically expensive since the manpower hours to do so is expensive. This is why tranche 1 EF2000s too expensive to maintain. But for PA it's inhiuse work. Because of the threat levels Cobras could be kept upgraded and in flying condition but used sparingly as alternatives become available.
As per my understanding at any given time PA keeps half of them in operation and remaining half in maintenance or reserve so that they are kept airworthy properly.
However it gets economically expensive since the manpower hours to do so is expensive. This is why tranche 1 EF2000s too expensive to maintain. But for PA it's inhiuse work. Because of the threat levels Cobras could be kept upgraded and in flying condition but used sparingly as alternatives become available.
As per my understanding at any given time PA keeps half of them in operation and remaining half in maintenance or reserve so that they are kept airworthy properly.