- "The new engines are an improvement over the P-s3s—fuel efficiency is 15 percent better and the heat exchangers are less prone to flux."
- ―Piers Roddance
The SFS P-s3 ion engine was a twin ion engine developed by Sienar Fleet Systems. It was the primary engine system of the TIE/ln space superiority starfighters until being replaced by the P-s4 ion engines, an improved model over the P-s3s.
- Servants of the Empire: Edge of the Galaxy (First mentioned)