The P-s5.6 twin ion engine was an ion drive manufactured by Sienar Fleet Systems during the height of the Galactic Civil War. It was an upgraded version of the SFS P-s4 twin ion engine used aboard TIE/LN starfighters.
- Star Wars Screen Entertainment
- The Stele Chronicles
- The Essential Guide to Vehicles and Vessels
- The Official Star Wars Fact File 17 (TIE4, Darth Vader's TIE Fighter)
- Star Wars Galaxies: Jump to Lightspeed: Prima Official Game Guide
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