K-H-W's answer is good, there is a physical point where self-destruct cannot be stopped. They don't need to explain why, explaining why would be distracting, it's enough that she tries but she can't. The out-of-universe explanation is a countdown adds tension, and they needed to show Ripley being unable to turn off self-destruct. Having done so, they also then put nice round numbers in place to make it easier for audiences to realise why it wasn't fixable after she'd changed her mind. It would appear that the film's makers realised that audiences need a more explicit explanation of why the ship is going to blow up and put in place a handy-dandy self-destruct sign to explain what's happening. Engines will overload in two minutes, fifty-five seconds.' Implosion incipient, followed by uncontainable overload and subsequent detonation. 'Mother, I've turned all the cooling units back on full!'
Gasping for breath, she leaned against the hot wall as she jabbed a button. Mother advises her that the process is simply too far gone to rectify. The official novelisation also strongly agrees. Engines will overload in two minutes, thirty-five seconds. MOTHER'S VOICE: (o.s.) Too late for remedial action. RIPLEY: Mother, I've turned all the cooling units back on. Ripley pushes a button and speaks into it. Ripley breaks out in perspiration from the intense heat.īegins throwing the cooling unit switches back into place. The door crashes open, Ripley comes pounding in. Engines will overload in three minutes, twenty seconds. Again, note the absence of a strict cut-off time limit. When she tried to remediate her actions less than two minutes later, the damage she'd already caused was sufficient to result in the ship becoming a ticking timebomb. Engines will over-load in four minutes, fifty seconds. The cooling units for the light-plus engines are not functioning. In the original screenplay, the self-destruct doesn't appear to be an intentional self-destruct system, it was just Ripley using her knowledge of the ship's engine to cause the power core to explode.
She misses it by seconds, but she does miss it. If it's still up, you can watch the whole deactivation process here, where I got the screencaps. She finishes the override steps as Mother hits the word "Now" in "The Option to Override detonation procedure has now Expired." (One is still all the way down, and she's partway pushed the other up, when 5 minutes hits and Mother makes the announcement.) (First, you see it hit 5 minutes, then it switches back to Ripley pushing the lever up.) and you hear mother say that "The Option to Override detonation procedure has now Expired." Ripley was still pushing the levers up when mother starts making the statement, which occurs right at the 5 minute mark. She finishes what she's doing at one console, and runs over to push the levers back up to finish the abort. When she approaches the 5 minute cutoff, you can hear Mother counting down As Todd-Wilcox mentions in the comments, you see her pushing down on the columns to try to make it go faster, since she can see that she's right at the edge of the time. If you look at the system when she's arming it, it makes it clear that there's a 5 minute window to deactivate TL&DR version: Ripley missed the window to disarm it by seconds.
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