L-3 Cincinnati Electronics (L-3 CE) is preparing to deliver to ATK Aerospace Group of Magna, Utah, a set of booster avionics units that will be used on the first two flights of NASA’s Space Launch System (SLS) heavy-lift rocket, the Mason, Ohio-based company announced Oct. 29.

The avionics control units, which recently completed qualification testing at L-3 CE, will fly on the twin solid-rocket boosters ATK is building for an unmanned SLS test flight currently planned for 2017 and a crewed test flight targeted for 2021. Once at ATK, the avionics units will be used to support system integration testing, a prerequisite to flight.

L-3 CE is under contract to provide avionics for the SLS solid boosters and hydrogen-fueled core stage.