Originally Posted by
hans brinker
Sorry, but it should never be needed. Either you have enough LDA to land in the touchdown zone, or you go somewhere else. Just because you haven't hit the runway lights doesn't make it ok.
On paper I agree with you 100%. In real life I am very aware that braking action during winter operations is not an exact science. So, I add 100 - 200 m to the 12 m margin my calculations give me. I can pretty much guarantee that if you spent a few days in my cockpit to see what we do in the winter season on short, contaminated runways situated near high terrain, with moderate turbulence, snow showers, wind and 4 degree glide slopes... you would do the same.