I might be having a bit of a slow start to the week, but after briefly reading the NPRM, I am not sure how or if part time CTAF's will work.
At an aerodrome where there is a part -time tower, non 24 hour op, outside of tower hours, does the CTAF become a non towered aerodrome and aircraft without radios are then permitted, or does it still remain by definition a towered areodrome.
If it is the 1st case, then I can see it raises problems with resuming tower operations as there may be aircraft in the airspace, not in comms. Also, there has to be an additional risk should the tower have to either open early or close later than published hours (normally to accomodate an RPT or an emergency).
As this change is not to comply with an ICAO procedure, I am also interested in what safety case the NASIG has, or will produce.