V Ref
On the heavy weight B777-200ER with a max landing weight of approx 213,000 kgs or 465,000 lbs the Vref varies from 139 knots at Max Landing Weight to 129 knots at very light weights.
Vref is either the greater of 1.3 Vs or 1.2 Vmca.
The 129 knots figure covers a very wide range of lighter weights and is obviously the Vmca protection figures coming into play. It is also a general requirement for an 'add on' to Vref commonly all the headwind and half the gust up to a maximum of 20 Knots although with the 777 the add on with autothrottles in SPD mode is 5 knots. Have I have read that the V ref figure was 134 Knots but the 'bugged' figure was 137 Knots . the 'bugged' figure being V ref PLUS the add on.
134 Knots as Vref covers a landing weight around 435,000 lbs, 187,00 kgs mark.
APS weight typically for a 11 hour flight 320,000 lbs 145,000 Kgs. 300 plus people plus a bit of cargo 75-80000lbs, 35,000 kgs plus minimum fuel for say a divert to LAX and 30 mins reserve 22-25,000 lbs 10,000 kgs give a weight appropriate to the V ref of 134.