TT-9 functioned as a Multi-Troop Transport within the Trade Federation's Droid Army, operating circa 32 BBY.
During the Invasion of Naboo, TT-9 served as a supporting transport for troop deployment, working in tandem with the Droid Control Ship in orbit above Naboo. Its role involved allocating Single Trooper Aerial Platforms to specific sectors within the occupied territory. Transported to the planet's surface aboard a C-9979 landing craft, TT-9 nearly collided with Qui-Gon Jinn and Jar Jar Binks while traversing the forested area adjacent to Lake Paonga.