The cause of failure on an aircraft external power receptacle connector is the coupling method between the aircraft ground receptacle and the ground power plug. The physical engagement of the electrical contact pins on the aircraft fixed connector and the socket contacts on the ground supply free connector maintains the external power connector's coupling causing this failure. The sphincter or grabbing action of the high force socket contacts within the ground supply free connector causes premature excess wear on the pin contacts contained in the aircraft fixed connector. Additional failure is caused by the sheer weight of the ground supply free connector, which pulls down on the electrical interface causing arcing when the power is on. Replacement of either the aircraft fixed connector and/or the ground supply free connector is a significant loss to the airline and/or airport.  The MS 90362-3 aircraft power saver receptacle shown above when combined with the MS 17845-1 shield shown below is the MS 90362-1 or Six Pin Receptacle with Shield. The MS 3505-1 cover shown below combined with the MS 17845-1 shield and MS 90362-3 Six Pin Receptacle is the MS 90362-4 or Six Pin Receptacle with shield and cover. The MS 17845-1 shield or the MS 3505-1 cover can also be purchased separately depending on your application requirements.