Also true for most aircraft in the US military fleet that aren't of the most recent generation. Depot maintenance strips them down, and pretty much everything but the frame itself could have been replaced by this point for anything over 30-40 years of age. They also do form, fit, function for LRUs so that the a new LRU can be dropped in and connected to the existing aircraft as much as possible, allowing for more gradual changes over time.
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Also true for most aircraft in the US military fleet that aren't of the most recent generation. Depot maintenance strips them down, and pretty much everything but the frame itself could have been replaced by this point for anything over 30-40 years of age. They also do form, fit, function for LRUs so that the a new LRU can be dropped in and connected to the existing aircraft as much as possible, allowing for more gradual changes over time.