What is a go-around?
A go-around is when a pilot breaks off a landing, climbs away and tries again. It is a normal safety procedure.
What happens
On the final approach the aircraft is close to the runway and low. If something is not right, the crew adds power, raises the nose and climbs away, then flies a short circuit and lines up for another approach.
Why pilots do it
The runway might not be clear, the aircraft ahead might still be on it, the approach might be too fast or off the line, or a gust of wind might make the landing unsafe. Air traffic control can also tell a pilot to go around.
Is it dangerous?
No. Crews practise it regularly, and it is a sign that the safety system is working. Most go-arounds end in a normal landing a few minutes later.
Watch for it
An aircraft descending towards the runway that then climbs again without landing has gone around. It often turns to the side to fly a loop back to the start of the approach.