David Clark C31-XX Series Extension Cords are required to connect the Series 3000 Ground Support Headsets to an Aircraft's external PJ-051 Jack. The C31-50 Extension Cord is a 50 foot, Straight Cord with (SC-838) Female Connector and (PJ-051) Plug.
C31-12: 12 foot, Straight Cord with (SC-838) Female Connector and (PJ-051) Plug
C31-25: 25 foot, Straight Cord with (SC-838) Female Connector and (PJ-051) Plug
C31-50: 50 foot, Straight Cord with (SC-838) Female Connector and (PJ-051) Plug
C31-100: 100 foot, Straight Cord with (SC-838) Female Connector and (PJ-051) Plug
C31-26: 26 foot (extended), Coil Cord with (SC-838) Female Connector and (PJ-051) Plug
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