A turbofan engine , comprising: a fan; a fan shaft operably coupled to the fan; an epicyclic gear-train including a journal bearing ; a bi-directional auxiliary pump operatively coupled to the fan shaft, the bi-directional auxiliary pump including a pump inlet and a pump outlet ; wherein rotation of the fan shaft in a first direction when the engine is in a non-operational mode causes the bi-directional auxiliary pump to transfer lubricant to the journal bearing by creating pressure at the pump outlet and by creating suction at the pump inlet and wherein rotation of the fan shaft in a second direction, which is opposite to the first direction, when the engine is in a non-operational mode causes the bi-directional auxiliary pump to transfer lubricant to the journal bearing by creating pressure at the pump outlet and by creating suction at the pump inlet; wherein the bi-directional auxiliary pump is a positive displacement pump comprising a first pump port and a second pump port ; wherein the bi-directional auxiliary 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; wherein the first and second plurality of check valves are arranged such that during rotation of the fan shaft in the first direction, lubricant under pressure expelled at the first pump port will pass through the pump outlet to be delivered to the journal bearing, and high pressure flow of lubricant will be prevented from reaching the low pressure second pump port; and wherein the first and second plurality of check valves are arranged such that during rotation of the fan shaft in the second direction, lubricant under pressure expelled at the second pump port will pass through the pump outlet to be delivered to the journal bearing, and high pressure flow of lubricant will be prevented from reaching the low pressure first pump port. a fan; a fan shaft operably coupled to the fan; an epicyclic gear-train including a journal bearing ; a bi-directional auxiliary pump operatively coupled to the fan shaft, the bi-directional auxiliary pump including a pump inlet and a pump outlet ; wherein rotation of the fan shaft in a first direction when the engine is in a non-operational mode causes the bi-directional auxiliary pump to transfer lubricant to the journal bearing by creating pressure at the pump outlet and by creating suction at the pump inlet and wherein rotation of the fan shaft in a second direction, which is opposite to the first direction, when the engine is in a non-operational mode causes the bi-directional auxiliary pump to transfer lubricant to the journal bearing by creating pressure at the pump outlet and by creating suction at the pump inlet; wherein the bi-directional auxiliary pump is a positive displacement pump comprising a first pump port and a second pump port ; wherein the bi-directional auxiliary 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; wherein the first and second plurality of check valves are arranged such that during rotation of the fan shaft in the first direction, lubricant under pressure expelled at the first pump port will pass through the pump outlet to be delivered to the journal bearing, and high pressure flow of lubricant will be prevented from reaching the low pressure second pump port; and wherein the first and second plurality of check valves are arranged such that during rotation of the fan shaft in the second direction, lubricant under pressure expelled at the second pump port will pass through the pump outlet to be delivered to the journal bearing, and high pressure flow of lubricant will be prevented from reaching the low pressure first pump port. <EOS>