Reply to post: Re: It's (almost) never the instrument.

Rewriting the checklists: 50 years since Apollo 13 reported it 'had a problem' – and boffins saved the day

Brian Morrison

Re: It's (almost) never the instrument.

This problem originated with a heated oxygen tank that wouldn't drain its liquid contents which was worked round by boiling it off, this process itself leading to the fused thermostat where the gauge that could have revealed the consequent overheating was unable to display a measurement above 80F because that was assumed to be covered by the (failed) thermostat action.

They were really lucky that the centre engine on the SII stage didn't fail under pogo oscillation, it only shut down because the 62g vibration made the thrust sensors indicate low thrust and the control system think that the engine had exhausted its fuel. 1 more second and the whole remaining stack would have broken up.

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