GVII Vref Additive

Updated: 11 Mar 2020

You must make the VREF additive called for by the AFM, it is no longer optional. You might think you already know how to do this, and you probably do, but there is an easier and safer way. This is a two step process. First, you have to make sure you have enough runway for the additional speed crossing the threshold. Second, you need to fly it. Fortunately, both of these steps can be done with a few key presses.

Step One: Do I have enough runway?

From the TSC FMS page select the "Perf Landing" page and enter the additive to the Threshold speed and Confirm Init to LDG Data. The computed landing distance will include this speed additive to your landing distance.

This automates the process of assuming you will be crossing the threshold with all of the additive so you can be assured you will still have enough landing distance. Many of us have been doing this manually for years.

Step Two: Fly the Additive

From the TSC FPLN page select "Flight Progress" and then "Departure and Approach Speeds" and enter the additive. The auto-throttle speed target will adjust automatically for you once you select the Flaps Down (39°) and will hold that until crossing the threshold.

In previous Gulfstreams we would MAN SPEED the target and you can do that with this airplane too, but don't. Keeping auto speeds will make a go around easier (one less button to remember).