Pressure alt at airfield: 0 ft, oat: 0'c, nil wind, ovc 003. Assuming icing conditions from 300ft on takeoff, max Vtoss.
Basic WAT graph fig 4.9 using anti ice and RIPS gives MTOM 26200lbs
Fwd climb performance graph 4.13 gives 25000 lbs for a 150 fpm climb OEI having applied the 440 fpm penalty. This agrees with fig 4.11 second segment graph.
This is a huge difference and led me to question what the basic WAT graph is guaranteeing as far as CAT A requirements are concerned. Some crews are relying completely on fig 4.9 even though it appears not to cover second segment requirements.