B777-200LR/F VREF floor
I noticed the -200LR/F has a VREF floor of 137kt up to a landing weight of of 220t. Only above that weight does it start to increase.
I assume boeing put this VREF floor in place to maintain the margin to VMCA. Considering the GE90-110BL1 increased thrust.
I have heard that some operators recommend flaps 25 when "light" to prevent floating and to decrease pitch attitude by 1º on landing. However looking at pictures online it seems most landings are done at flaps 30 regardless.
For the guys flying the LR/F is there a rule of thumb weight you use to decide on Flaps 30 vs. 25 under normal circumstances. Flaps 25 < 200t etc.