Coolant transfer system and method for a dual-wall airfoil

A dual-wall airfoil configured for coolant transfer, the airfoil comprising:

• a spar having a pressure side wall and a suction side wall meeting at a leading edge and a trailing edge of the airfoil, each of the pressure side wall and the suction side wall including raised features on an outer surface thereof, an interior of the spar including coolant cavities;
• inlets at a base of the spar for feeding coolant into the coolant cavities, one of the inlets being partially or completely blocked such that coolant flow into one of the coolant cavities is inhibited or prevented;
• a pressure side coversheet overlying the pressure side wall, an inner surface of the pressure side coversheet being in contact with the raised features on the outer surface of the pressure side wall, thereby defining pressure side flow pathways between the pressure side wall and the pressure side coversheet;
• a suction side coversheet overlying the suction side wall, an inner surface of the suction side coversheet being in contact with the raised features on the outer surface of the suction side wall, thereby defining suction side flow pathways between the suction side wall and the suction side coversheet,
• wherein the pressure side flow pathways include a pressure side cooling circuit configured to direct coolant from a first or second of the coolant cavities into another of the coolant cavities, and/or
• wherein the suction side flow pathways include a suction side cooling circuit configured to direct coolant from the first or second of the coolant cavities into the other of the coolant cavities.