Sienar Test Facility 73

The revolution starts now.

Warning! This page contains spoilers from the episode "One Year Later" of Andor. Caution is advised.

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 Advanced 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 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]