Wake Turbulence and Landing

Featuring Bob Nardiello

Subscriber Question:

"What is the best way to avoid wake turbulence when landing behind a big airplane?"
- Glen D.

Bob:

"We need to note the preceding aircraft's touchdown point, particularly if it is a large aircraft. And we need to land after that touchdown point. Our glide path should at all times be above the glide path of the preceding aircraft, and be to the upwind side, so again, we need to know where the wind is coming from, which side of the aircraft the wind is from. We want to be on that upwind side. Again, glide path above, touch down after the point of touchdown in the preceding aircraft.

How do we know we are in fact, above the glide path of the preceding aircraft? There are a number of ways to do it. One, if you have a glide slope capability in your airplane, note where you are on the glide slope of that runway, if it in fact, has an ILS installation. If it has PAPI or VASI lights, try to be slightly above that glide path. Again, you are assuming that the preceding aircraft is, in fact, on glide path.

I will tell you a method that I use to establish whether I am at, below, or above the glide path in a preceding aircraft. It is pretty simple. Sight through the preceding aircraft to the runway. Note the touchdown zone markings on the runway and where your sight line intersects the runway. If it intersects beyond the touchdown zone markings on the runway, you are below the glide path of the preceding aircraft. If that sight line intersects prior to the touchdown zone that is painted on the runway, your glide path is above the preceding aircraft."