Hi,
well, what I can say is that after a pretty serious maintenance vist, for the most part, most aircraft maintain their personality. Each one, no matter where their "build number" lies in the production run, all have their own little quirks or personality. For example, the airline I used to work had at one time, over 50 747's, each one had points where we knew from experiance when and where the defects or cracks would occur. Several of them we had nicknames for. 3 of of the -100 747's we used to refer to a "Bud, Coors, and Miller", because of their respective age. And they had gotten to a point, that while airworthy, they just had developed so many "issues" that it was a matter of time before they were turned into their nicknames.
But from a pilot's point of view, each time those very same 747-100's had a major maintenance visit, the pilots complemented us on the fact that while the planes were the same, the personality of each "perked-up" and they flew much better.
I believe, personally at least, that each aircraft, while it is a machine, has it's own personality. The folks that built them gave them that....and it was just a matter of time and experiance that people learned that particular aircraft personality.
But, I guess you gotta be around them long enough to know the aircraft and ask it "where it hurts" to get to know the patient. Kinda like being a doctor of sorts.
I hope that this helps abit.....but for the most part I believe it true.
Paul
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