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Why doesn't the ROC formula work when you are coming down?
ah .. now, what percentage gradient is 3 degrees equivalent to ? .. and what does 10/2 equal ? |
Hmmm.
So you get a SID in your brief that has a minimum climb gradient...how do you know you can comply? Next time your flying your Airbus or 747, look to your right or left under the window, there is usually a big white book, it's called a Flight Manual. Give it look, some great information in there. :ugh::mad: |
Because ROC on Approach is not the GPA. Simplistically, it is 1 degree below the effective GPA, and begins at the threshold crossing at 200'ROC (yes, below ground)
The FAA model is very simple, it assumes a 3 degree GPA, a 200' ROC, originating at a straight line down at the threshold, sloping up at 2 degrees until it is a 500' ROC, that is the location of the FAF... its just that simple... |
FlightPathOBN:
Because ROC on Approach is not the GPA. Simplistically, it is 1 degree below the effective GPA, and begins at the threshold crossing at 200'ROC (yes, below ground) The FAA model is very simple, it assumes a 3 degree GPA, a 200' ROC, originating at a straight line down at the threshold, sloping up at 2 degrees until it is a 500' ROC, that is the location of the FAF... its just that simple... |
here we go again...
okay, go to the FAA supplied worksheet. in the block, distance of obstacle from LTP put 0... what is the ROC at the LTP? 200. |
You must have a worksheet for something else.
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FlightPathOBN:
here we go again... okay, go to the FAA supplied worksheet. in the block, distance of obstacle from LTP put 0... what is the ROC at the LTP? 200. The ROC at the 200-foot DA point on a 3 degree slope beneath the "W" OCS is approximately 121 feet. (Calculated from Volume 3 of FAAO 8260.3B, not a worksheet). |
if you know what the gradient is you will know what speed.it is actual speed (GS.).
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Without getting into it there's lotsa horse hooey in this thread spouted by non-engineers Jetpipe non sequitur:=
pilots....Read the flight manual...:rolleyes: :zzz: |
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