In order to maintain a 25 minutes turn around Ryanair uses a simplified loadsheet stating:
Rule 1: Mandatory: With 177 pax or less fwd rows 3 and 4 must be blocked
Rule 2: Optional: Both aft and fwd balance limits may be extended by 0,4 units for ZFW and TOW, provided:
a) No pax seated in the fwd 6 and aft 4 seat rows; maximum of 132 pax, or
b) 178 or more pax carried, or
c) Ferry flight (No pax)
Perhaps you should consult with the manufacturers FAA certified weight and balance manual. I'll bet a week's wages you will not see any reference to the 25 minute turn around time within the document. But perhaps the IAI has a different slant on this issue
