Class B · landing and balked landing
Calculate the landing allowance and keep enough climb capability for a go-around.
Does landing performance fit both stopping and climbing?
For normal class-B CAT dispatch on a dry runway, landing distance from 50 ft must fit within 70% of LDA. If the chart gives an unfactored AFM landing distance, the dry required LDA is distance/0.70. Apply wind, slope and surface corrections as prescribed and avoid refactoring a chart that already contains the operational margin.
Work from LDA back to demonstrated distance
For normal class-B CAT dispatch on a dry runway, landing distance from 50 ft must fit within 70% of LDA. If the chart gives an unfactored AFM landing distance, the dry required LDA is distance/0.70. Apply wind, slope and surface corrections as prescribed and avoid refactoring a chart that already contains the operational margin.
For the normal wet-runway case, the dry required landing distance is increased by 15% unless qualifying approved wet data allow the applicable alternative. Contamination requires the relevant data and rule; a generic wet multiplier does not describe every contaminant. Specific approvals such as CAT.POL.A.355 have different conditions and are not a default substitute for the 70% rule.
Read the landing mass from every constraint
Use the correct flap and actual pressure altitude, temperature, surface, slope and wind. Inverse interpolation gives the field-length-limited mass. Read VREF for that actual mass. If the chart separates airborne distance and ground roll, retain both: improved braking does not erase an excessive airborne portion.
Balked-landing climb checks use the charted configuration, speed, gear and engine condition. Maximum allowed landing mass is the lowest of field, structural and applicable climb limits. Hot/high conditions can reduce the climb limit even when the landing-distance calculation still fits. A dispatch calculation does not remove the need to reassess actual conditions at arrival.
Can you make the performance decision?
Four original questions. Work from the stated conditions and review the reasoning.