The Maximum Structural Landing Mass (4 700 kg) is the maximum permissible total helicopter mass upon landing under normal circumstances.
The Performance Limited Landing Mass (4 300 kg) is the landing mass limited by similar destination airfield considerations and derived from performance calculations.
The Regulated Landing Mass is the lower between the Performance Limited Landing Mass and the Maximum Structural Landing Mass: 4 300 kg.
NOTE:
The contingency fuel consumption is irrelevant to the question.
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