About 15 years ago we diverted into STN with an A300 because the gear would not retract and we had maintenance there. We told ATC that we had 3 greens and there was no problem, however they had lots of emergency vehicles out to greet us.
After landing I spoke to the fire chief and told him that the only problem was that we couldn't get it up. He suggested we use Viagra next time.
If you speak to airport emergency people they will tell you they would rather be called out early and not be required than be called out late to attend a pile of smoking wreckage.