Sienar Test Facility 73

This article is about the test facility that held the TIE Avenger prototype. You may be looking for the planet it was located on, Sienar TF73.

Sienar Test Facility 73 was a Sienar Fleet Systems testing facility on the planet 73. In 4 BBY, Cassian Andor stole a TIE Avenger prototype from the facility.

Description

Sienar Test Facility 73 was a testing facility operated by Sienar Fleet Systems, located on the snowy planet 73; one of the various numerically designated planets owned by the company.^[2] The facility consisted of a series of connected structures and contained at least one commissary^[3] and at least three hangars.^[1]

History

By 4 BBY, the facility was operational, with its own workforce and a dedicated defense battalion^[2] consisting of stormtroopers, range troopers and at least two TIE/ad v1s. In 4 BBY, its workforce included Niya, her coworker, and her supervisor. During that year, Niya assisted Cassian Andor, a rebel operative posing as a Sienar test pilot, in stealing the facility's TIE Avenger prototype from one of its hangars. During the theft, Andor damaged the hangar using the TIE’s weapon systems.^[1]

Behind the scenes

The Sienar Test Facility 73 appeared in the first episode of the second season of the live-action series Star Wars: Andor, which was released on Disney+^[1] on April 22, 2025.^[4] The facility was first revealed prior to the release of the episode in a sizzle reel for the series exclusively shown at D23 Expo on August 12, 2024.^[5]