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• ERBS sep timer: once it times out, a regrapple does not restart it. Relays which timer closes can be opened by PROP BUS PWR SHUTDN switch PROP BUS PWR - SHUTDN opens: Pri PROP BUS RELAY B/U PROP BUS RELAY B/U XMTR/NE1 bus RELAY these can be closed by rf cmd. • inhibit switches: PREARM - both SAFE & PREARM sides are actually wired. Switch is momentary ARM - only ARM side is wired, but switch is not momentary... in ARM, pwr is continuously applied to relay to hold it down DPY - only DPY side is wired, but switch is momentary: relay is closed only while switch is held (pwr is applied to NEI as "one-shot") • if RMS demates while umbilical is retracted, then see PREARM - bp MU BUS - bp note EMP tb will stay ON