A work in progress by John D. Current limiting arming board The CLAB limits the current to the firing circuits to 10 ma.  This is just enough to power the continuity test circuit but way below the required amount to fire the igniter.  So in the case of a damaged firing circuit, stuck or faulty relay or even if someone pushes the button at the LCO the igniter cannot fire.  You will see a relay on the CLAB as well as relays on the individual firing boards.  BOTH relays need … Continue reading →