Roll a d100 and look at the table:
1-10%- navigation systems shut down-cannot interspacially travel
11-20%- Communications Failure-no communica can be sent
21-30%- Engine Failure-speed=1lyh 31-40%- fire-2d6*10 damage per round.
41-50%- sheilds buckle-no armor
51-60%- Tracking Systems failure- -10 to strike
61-69%- Thruster systems fail--10 to dodge
70-80%- Weapons malfunction-cannot attack
81-90%- spacial spin-ship is caught in spacial spin and cannot attack for 1d6 rounds
91-99%- Hull breach-imobilized, that section is unusable until fixed, and anyone in that section is killed
100- Stasis lock-ship fails to function at all