Reference is EU OPS 1.510
The landing weight of the aircraft shall not exceed the maximum landing weight specified for the altitude and the ambient temperature expected for the estimated time of landing at the destination and alternate airport.
For instrument approaches with a missed approach gradient greater than 2.5%, the expected landing mass of the aeroplane shall allow a missed approach with a climb gradient equal to or greater than the applicable missed approach gradient in the one- engine inoperative missed approach configuration and speed.
The use of an alternative method must be approved by the Authority (*)
For instrument approaches with decision heights below 200 ft, the approach weight of the aeroplane, taking into account the take-off weight and the fuel expected to be consumed in flight, must allow a missed approach gradient of climb, with the critical engine failed and with the speed and configuration used for go-around of at least 2.5%, or the published gradient, whichever is the greater.
(*) The required missed approach gradient may not be achieved when operating at or near maximum certificated landing mass and in engine-out conditions. Mass, altitude and temperature limitations and wind for the missed approach should be considered.
As an alternative method, an increase in the decision altitude/height or minimum descent altitude/height and/or a contingency procedure providing a safe route and avoiding obstacles, can be approved.
Taking into account the regulations following the contingency procedure for go around is an option provided it's approved and published in the manual or if PIC regards it to be the safest coure of actions.
P.S there's two requirements:
approach climb assuming OEI and gear up etc requiring 2,1 %
landing climb assuming normal config and gear down 3,2 %
For all Airbus aircraft, this constraint is covered by the approach climb requirement. In its operational documentation (FCOM), Airbus publishes the maximum weight limited by the approach climb gradient only. Landing climb performance is found in the AFM. Those are just certification requirements.
Compliance with a published MA climb gradient must be evaluated for the very concrete approach with valid data. Keeping contingency procedure for a EO in case of a go around is always IMHO a must.
