Fuel Factor Penalty
I believe that the FPF needs to be applied to Remaing Trip (at current alt and GS) + Contingency + Final Reserve Fuel.
For example if landing gear locked down (FPF 2.0) and FMS says at Fl 200 and GS of 240kt with FL200 winds inserted in FMS the trip is 15T Contingency 2T and FR 3.0T
Then 15+2+3=20t x 2 = 40T if you have 40T then you could continue. If not then return or divert to a much closed airport.