To determine the allowable landing weight for a transport category airplane, the following details must be considered: (1) Airfield pressure altitude; (2) Temperature; (3) Headwind component; (4) Runway length; (5) Runway gradient or slope; (6) Runway surface condition. With these details, it is possible to establish the maximum allowable landing weight, which will be the lower of the weights as dictated by: (1) Landing runway requirements; (2) Approach climb requirements