Originally Posted by
gjhome
For a wet runway you should use, dry distance(with 60% margin) * 1,15.
For a contaminated runway, you should use the longest value of two:
Either the one above dry * 1,15 (wich includes the 60% margin)
If your AFM contains values for contaminated runways,
The value from the book for the selected contaminanr * 1,15
In this case, there is notes in jar-ops saying that you should NOT include
the 60% margin.
Now, I apologize for being a pain in the neck. The rules are probably relatively simple, but the wording is quite complicated. In order for both of us to get through the woodwork, we need to keep a high standard of precision.
1) It is not a 60% margin. It is 1/0,6 margin (=1,666`).
Let's call it 60% rule for simplicity.
2) It cannot find that you need to use the larger value of two, as I read it, you must use method number 1, and if appropriate calculation with contaminated data yields a shorter RLD, you may use it. I cannot see the "longest of" requirement.
3) 15% addition with AFM contaminated data is correct I you ask me: sub-pragaraph (b), also that no 60% rule should be applied to this,
4) However the wet data is described in sub-p (c), which offers possibility to use wet AFM data (no 15%+ here), but rules for dry runways must be applied first (60% rule).
?
FD.