Overweight landings have to be done with reduced flap settings due to the fact that the ref speed will be above the limit speed for flap 30.. Flap 20, 25 and 30 is approved flap settings for landing the -300 allthough with a long enough runway itīs possible to land it flaps up.. (done it in the sim, very high ref speed..) Btw Shore guy, the LE high lift devices are fully deployed with flaps 25 or greater in the normal system and flaps 20 in the alternate system..