A turbofan engine, comprising: a fan; a fan shaft operably coupled to the fan; a gear including a gear bearing surface, the gear operatively driven by the fan shaft; and a pump (200; 300) operatively driven by the gear, the pump including a first pump port and a second pump port, wherein the pump (200; 300) comprises a positive displacement pump and the positive displacement pump comprises a first plurality of check valves (304; 310) operatively coupled to the first pump port and a second plurality of check valves (316; 322) operatively coupled to the second pump port; characterized in that the rotation of the fan shaft in either direction causes the pump to transfer lubricant to the gear bearing surface, via either the first pump port when the gear rotates in a clockwise direction or the second pump port when the gear rotates in a counter clockwise direction, when the engine is in a non-operational mode; and in that the first plurality of check valves (304; 310) comprises: a first check valve comprising: a first valve inlet; and a first valve outlet; wherein the first valve outlet is operatively coupled to the first pump port; a second check valve comprising: a second valve inlet; and a second valve outlet; wherein the second valve inlet is operatively coupled to the first pump port; the second plurality of check valves (316; 322) comprises: a third check valve comprising: a third valve inlet; and a third valve outlet; wherein the third valve inlet is operatively coupled to the second pump port; and a fourth check valve comprising: a fourth valve inlet; and a fourth valve outlet; wherein the fourth valve outlet is operatively coupled to the second pump port. a fan; a fan shaft operably coupled to the fan; a gear including a gear bearing surface, the gear operatively driven by the fan shaft; and a pump (200; 300) operatively driven by the gear, the pump including a first pump port and a second pump port, wherein the pump (200; 300) comprises a positive displacement pump and the positive displacement pump comprises a first plurality of check valves (304; 310) operatively coupled to the first pump port and a second plurality of check valves (316; 322) operatively coupled to the second pump port; characterized in that the rotation of the fan shaft in either direction causes the pump to transfer lubricant to the gear bearing surface, via either the first pump port when the gear rotates in a clockwise direction or the second pump port when the gear rotates in a counter clockwise direction, when the engine is in a non-operational mode; and in that the first plurality of check valves (304; 310) comprises: a first check valve comprising: a first valve inlet; and a first valve outlet; wherein the first valve outlet is operatively coupled to the first pump port; a second check valve comprising: a second valve inlet; and a second valve outlet; wherein the second valve inlet is operatively coupled to the first pump port; a first check valve comprising: a first valve inlet; and a first valve outlet; wherein the first valve outlet is operatively coupled to the first pump port; a first valve inlet; and a first valve outlet; wherein the first valve outlet is operatively coupled to the first pump port; a second check valve comprising: a second valve inlet; and a second valve outlet; wherein the second valve inlet is operatively coupled to the first pump port; a second valve inlet; and a second valve outlet; wherein the second valve inlet is operatively coupled to the first pump port; the second plurality of check valves (316; 322) comprises: a third check valve comprising: a third valve inlet; and a third valve outlet; wherein the third valve inlet is operatively coupled to the second pump port; and a fourth check valve comprising: a fourth valve inlet; and a fourth valve outlet; wherein the fourth valve outlet is operatively coupled to the second pump port. a third check valve comprising: a third valve inlet; and a third valve outlet; wherein the third valve inlet is operatively coupled to the second pump port; and a third valve inlet; and a third valve outlet; wherein the third valve inlet is operatively coupled to the second pump port; and a fourth check valve comprising: a fourth valve inlet; and a fourth valve outlet; a fourth valve inlet; and a fourth valve outlet; wherein the fourth valve outlet is operatively coupled to the second pump port.