T. Arp was a Human Starfleet officer in the 22nd century.
In 2151, he was listed as a Mission Ops officer on the dedication plaque of Enterprise NX-01. (ENT: "Broken Bow", dedication plaque)
In 2154, he was listed as a Deep Space Operations officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque).
In January 2155, he was listed as a Propulsion Systems officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #3450. (ENT: "Demons", directories)
This character was only mentioned in writing.
He was named after set construction coordinator Thomas J. Arp.