Other than that, I know nothing. Any help? Dividing the MDH by would give an approx distance from the touchdown point in miles. The ' downfield would be met by the delay in your reaction time, so not something to worry about, just subtract if from the end of the runway.
How you determine that point would depend on what type of approach, what equipment you had, etc. Having said all that, if a VDP has not been established, then there is NO guarantee that you do not have obstacles between the MDA and the runway that project into the nominal path. There is no requirement on a non-precision to ensure that it is obstacle free, so unless it's also served by an ILS, you are taking a bit of a chance during the visual segment.
A "roll you own" VDP can work, but you have to be very careful with it for that reason. MikeD Administrator Staff member. Take the desired glidepath you wish to calculate for ie 3 degrees and divide it into the Height Above Touchdown.
Take that figure as miles, and count back from the beginning of the runway to get where your VDP would be. Easy example: You have an airport where the HAT is ', and your desired glidepath is 3 degrees.
Take 3 degrees and divide it into the HAT of That gives you 2. That's a very simplified example, but the equation works well when you have DMEs miles compute to things like 1. Here is how it looks:. You could even pick up a 3. You mentioned the VOR-A as the low ceiling option. It could be that if you cannot spot the runway from that direction it is a nonstarter.
But if you can, it may actually offer a better chance at a stable approach. The key point to remember is that you want to roll out on final 1. Doing the math, you need to start down about a quarter of the way through the turn. I don't expect anyone to go through all this math, but you just need to envision that your target on rollout is ' AGL.
So if this was a day approach underneath a distinct ceiling with good visibility, the VOR-A could be a good option. But notice that the approach's viability minimum of 3 statute miles is only 2. I would be very tempted to bypass all this and head for Burbank. Always remember that Eddie, when you get right down to it, is just a pilot. He tries to give you the facts from the source materials but maybe he got it wrong, maybe he is out of date. Sure, he warns you when he is giving you his personal techniques, but you should always follow your primary guidance Aircraft manuals, government regulations, etc.
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Visual Descent Points Instrument Procedures. Eddie sez:. Last revision: Visual Descent Points. Definition A Visual Descent Point is found by subtracting the touchdown zone from the Minimum Descent Altitude and dividing the result by Improve this question.
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