Why did the Space Shuttle have an indicator to alert the crew to the arming of the range safety destruct system? Quoting from here:
The first message, called arm, allows the onboard logic to enable a destruct and illuminates a light on the flight deck display and control panel at the commander and pilot station. The second message transmitted is the fire command.
This seems, er, rather grim. Why is this light there?
Edit: Perhaps it is used for testing purposes - can anyone provide a reference for whether this indicator was used by the crew or ground personnel during pre-flight checkout? Second idea is that it was to alert the crew to accidental arming, however since the command decoders appear to have used some type of encryption this seems unlikely to have occurred accidentally by remote. If the range saftey system had become armed by an internal vehicle fault, is there anything the crew could have done about it?