After the SES-3 (OS-2) spacecraft was removed from its container, the mechanical fitcheck commenced.  The mechanical fitcheck verifies the mechanical interface to the adapter ring, including the clearances for the umbilical connectors and adapter harness.  During this operation, two specialists from RUAG worked in conjunction with Orbital mechanical engineers.  Once the fitcheck was complete and all connections were verified, Orbital engineers transferred the spacecraft to Hall 103A for stand-alone testing.