Visual Approach Slope Indicator ... VASI
(Note: links to the compulsory student approach are at bottom of the page)
At most sites, if you are a bit high on downwind, you may extend downwind and make a longer final approach. This is not easily done at the Andy Jackson Airpark because of the LZ being so close to the base of the hill. Being at the right height when turning from downwind onto base is important at making it an easy approach. Your glideslope while on downwind may be visually measured using our VASI. (Visual Approach Slope Indicator) photo by Vinny Casolaro
Choose a glideslope appropriate for the type of wing you are flying as outlined at the bottom. Start your downwind when the VASI is indicating your glideslope. While on downwind, dive as needed to stay on proper glideslope as you fly directly at the VASI. As you get within a couple hundred feet of the VASI, turn onto base (parallel to the trees).


As shown at the left, this VASI consists of an 8' tall vertical sign of a white square on top of a red square. Located 24' behind the sign (closer to the hill) is a horizontal white board. The horizontal board is the same elevation as the base of the red & white vertical sign. The glideslope is shown by the pilot seeing where the horizontal line intersects the vertical red and white signs.


3 to 1
4 to 1
6 to 1
8 to 1
12 to 1
Experience has shown that for most conditions, splitting the red/white (6:1) is good for single surface gliders. Intermediate double surfaces should be 3/4 the way up the red (8:1), and competition double surface wings should center the red (12:1), but pilots flying these wing probably don't need the VASI. Conditions also affect glideslope so it is best to think of the VASI as a training aid with the ultimate goal to be able to shoot your approaches by reference only to the landing area.


New students into the Andy Jackson are required, when training with High Adventure, to execute a compulsory pattern so that when doing radio solos, the instructor knows the student's intentions and is therefore better able to recognize when assistance is needed. Here are links, first to a PDF file describing the approach then below that, are some google earth ".kmz" files describing various approach scenarios. Please turn on your speakers with the kmz files to hear the descriptions during the tours.
The 2 page PDF file describing the approach.
Standard Approach when winds are upslope. (google earth)
Standard Approach with overshoot. (google earth)
Reverse approach when winds are downslope. (google earth)
Reverse approach with undershoot. (google earth)