If the system is ready to return to service ahead of schedule, the technician just has to make a phone call to the CC, and they can cancel the NOTAM early. If in their judgement it is close enough (horseshoes and hand grenades right?), they may just let it expire.
This is kind of the crux of my question.
How do you know that it came back online at 1500?
Tower tells me it's back up and running.
Just because there's a signal there doesn't mean it's accurate/usable. Such was/is the case for many ground-based navaids in Florida after Hurricane Ian. Sure, some of the navaids were still putting out signals after the hurricane, but they weren't pointed in the right directions. Even 100+ days later, there's still many ILS and VORs U/S down here, some which are outputting a signal. Could you use them despite them being NOTAM'd U/S? Sure. But no guarantees on where you'll end up.
I get that. I wouldn't use a NAVAID that was NOTAM'd OTS unless getting confirmation it's accurate.
This whole academic scenario came from a discussion I was having with another airline captain buddy of mine.
His real life scenario was that he was enroute to his destination with a NOTAM for the CATII ILS and RVR being OTS for the preferred runway until 2 hours after his planned arrival. On the way there, the weather started going down, and he contacted his dispatcher to get an update on the weather and ILS status. The dispatcher wrote back and said that they called the tower at the destination and the tower said that the RVR and ILS would be operational by the time my buddy arrived.
This is where he and I disagreed. He said that even if tower said the RVR and ILS were operational, he wouldn't use them unless they confirmed that the NOTAM was removed. I said that I didn't care if the NOTAM was still there or not, as long as tower confirmed that they were operational I would use it.
There was a little more nuance, but that was the gist.
To boil it down and make it simple, I gave the same scenario with a runway closure. Runway is closed for rubber removal and scheduled to be back up at 0700L. I'm getting there at 0630L, and tower tells me the runway is now open. I ask tower "I had a NOTAM that the runway was closed to 7, confirm it's open." Tower says "yes, it's open." I land. My buddy would ask if the NOTAM has been removed from the system, and if tower says the NOTAM is still there, but the runway is open, he's not landing until the NOTAM is gone.
I guess the piece of the puzzle we're missing is how long it takes for something like that to run through the NOTAM system. It sounds like it varies depending on what it is and who has control over that NOTAM.
Now we don't know if he's an anal pilot that has no common sense, or am I reckless cowboy pilot with no regard for NOTAMs.