Typically, during every inspection a good mechanic will look at them, but if there are no leaks, and everything seems OK with them, then no further action is taken. This is, of course, just my opinion.
Think of it like this: You walk up to your car in a parking lot, and glance at your car. You see the tires all have air in them, you think no more about it. If there was a flat, you’d stop and re-evaluate, how to get it fixed, put the spare on, etc.