Imperial
Using airport planning books is leading you up a wrong path. Take-off field lengths in those manuals refer to a runway without any clearway or stopway. If TORA, TODA & ASDA are different, it is possible (but not simple) to convert these into an equivalent balanced field length so the airport planning charts can be used. But for that you need a proper performance manual or software.
Plus: "TODA includes a CWY and a SWY"....
There is no notion of stopway in the definition of TODA.
Firstly a runway does not necessarily have a stopway beyond the end of the runway.
Secondly imagine a runway which finishes at the top of a cliff, below which is the sea. In this case there is no stopway but an enormous clearway which helps to extend the TODA quite a bit.
Last edited by kwateow; 13th Jan 2012 at 09:52.