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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