Thankyou FE Hoppy and CheckBoard for the refrences and the document's text. If I have understood correctly according to the document OPS 1.475 and 1.515, 40% safety margin is required for turbo jets. ( i.e. within 60 % of the landing distance available)
According to this document, this factor (i.e. 40% for turbo jets) also applies at the start of takeoff in addition to inflight re-planning. (If I have understood correctly).
So where does the 67% dispatch safety factor go according to these documents? Is 67% only a Boeing figure?
