Aircraft are certified for 10 knots tail wind
The certified value of 10 knots tail wind has nothing to do with the landing only the approach.
If we are approaching an airport we are allowed to make an approach with maximum 10 knots tail wind. Then we are safe to make a go around from minima with one engine out and still clear the obstacles in the climb out pattern.
The landing has to be evaluated and decided by the captain.
It is like waiting with the car at red light, we are allowed to start on green, but the driver is responsible for the street to be clear before he accelerate.
http://gunnarfahlgren.authorsxpress.com/
