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50 years ago: Apollo 10 takes an unplanned spin above the lunar surface – and sh!t gets sweary

Anonymous Coward
Anonymous Coward

either a flip switch or a turn switch have pretty distinct actions for their different states, and attempting to set them into a position they were already in would feel immediately wrong even without looking

The PGNCS to AGS guidance control switch was a simple toggle switch that you can see here (top left control panel, uppermost toggle switch on the RHS, a little above the 'ABORT STAGE' button, labelled 'GUID CONT':-

https://www.hq.nasa.gov/alsj/a16/LM11-co47.jpg

From the article, Cernan said that they hardly looked at the switches when they were busy. Presumably Stafford made the assumption that it was in the PGNCS position when going through his checklist, and simply toggled it without looking, inadvertently switching back to PGNCS mode.

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