There is an interesting connection with all-of-the-above and the latest edition of CASA's (nicely done) "Crash Comic" video-series.
The short "Playing the Wrong Card" recounts a pilot's tale about a mid-air-near-miss he'd had at an unnamed non-controlled airfield.
In it, he confesses to having been at fault for tuning in the wrong CTAF numbers due to his relying on outdated info in his GPS unit.
Anyway, CASA concludes the cautionary tale with this advice:
STILL FRAME FROM VIDEO (Click for full rez):
But getting back to our Tumut case, even till now aviators consulting their current ERSA would see an out-of-date CTAF frequency.
And, as far as I can tell, there are no NOTAMs current warning of this error.
(Although, as noted above, a NOTAM was issued around the time of the change.)
The current ERSA, as in OzRunways (and elsewhere) is the soon to end 19th March edition.
And I see that in the upcoming July 9th version the change has been made. (That is, from 126.7 to 126.85)
However, this means that for the past 20 weeks ERSA has been wrong on this crucial piece of operational information.
And, as Thruster suggests (above), over that time there must have been at least "a few NORDO aircraft at Tumut ".
And blame could not be put upon some hapless pilot's out-of-date GPS. Nor, it seems, on his failure to 'read the NOTAMs'.
Of course, there are going to be times when, for safety's sake, changes like this ought to be made in between
official publication dates. But in any such cases CASA would do well to follow its own advice;
do what's needed to get rid of any jokers in the pack.