Schematic Category
Mark I Engine Upgrade

This category is a subcategory of Mark II Engine Upgrade

The following schematics belong to either the Mark I Engine Upgrade category or a descendant of the Mark I Engine Upgrade category and can thus be used in a slot that requires an item of the Mark I Engine Upgrade category:

Propulsion Technology I: Simple Ion Drives
- Engine Limiter - Mark I
- Engine Overdriver - Mark I