Other than the starter duty cycle limit,the button pop out was to take place at a stated % RPM depending on which starter was installed.Some were 53% but most were 64%.This was on the "A" models. There was a small reverseable placcard just below the starter button with 64% on one side and 53% othe other.On an engine start the pilot,C/C or eng. man would,just before pressing the starter button say "turning #(say eng.) at plarccarded RPM.
If the button didn't pop by that RPM or just above it the button was to be pulled.
Start-up Checklist
in C-130 Technical
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