In an
emergency usually if you can TO if you could also land reasonably well---
because most Air regulation [I do believe this is universal]---allow the PIC to deviate from legal requirements---
To the extent neccesary---to face that emergency----so LDR---requirements shouldn't matter---in fact in USA regulations---part 91 LDR--is written such that it includes no margin--although sensible pilots leave a margin
---although FAR 25 ships operated under air carrier rules don't usually publish such data--it's easy to calculate---although it's like apples and oranges it is comforting to know you do have a rather large 'emergency' margin available----but you'd better have bona fide emergency---
PA