Common sense will tell us that the Vigilant fleet (most of which were flown to their current store) are not falling apart or indeed in bad shape.
Common sense does not stand up in a court of law. Should there have been any incident or, God forbid, accident there would have been no defence. That is an unacceptable risk when dealing with children's lives. And all because 'common sense' was relied upon because it was easier than proper record keeping.