kilemall
SOC-14 5K
Not quite, a critical hit knocks out the entire system, not just a component. Also see Drive Failure, LBB2, p6.
The way I see it is:
A PP-4 might have two reactors but only one power distribution system so they work together.
Real redundancy means not just having an extra reactor, but an entire extra independent power distribution system (meaning it can't work together with the primary system).
This.
I use HG for space hazards too, ship crashes and solar flares to give two examples. Don't want to be 20 parsecs deep into unexplored/anarchic/enemy territory and have an accident that strands you hard.
PP-1 and M-1 is a minimum, just to make sure you maintain astronomical object/planet impact avoidance.