A crippled vessel may not move faster than a strategic speed of 3, and has a weapons status one level lower than it normally would at the start of any scenario (cumulative with all other modifiers). If it has no engine boxes, it may not move. All HET bonuses are lost, and any subsequently repaired (by any process) engine boxes will be marked destroyed if the ship participates in combat in any capacity. Such damage is applied after the combat has ended.
Such a vessel retains its crippled status until it has been overhauled and its warp engines (if any) have been replaced. A crippled warp-capable vessel's Dilithium is considered destroyed, but the crystal fragments will continue to serve it until its overhaul.