PurposeUSED TO TROUBLESHOOT AIRPLANE SYSTEM WIRING WITH INTERFACE HAVING CIRCULAR CONNECTORS OF MIL-DTL-38999/26 TYPE, SUCH AS BACC63DB, BACC63CT, AND BACC63EB AND CONTAIN AT LEAST EITHER SIZE 20 OR SIZE 22 CONTACTS OR QUADRAX CONTACTS.Airplane787-10, 787-8, 787-9Usage CodeMAINTENANCE, OVERHAUL 