Reason for asking is that in the event of all Pitots / statics being blocked, can atc still display aircract altitude.....
ATC displays will show the same altitude as in the cockpit, so in case of blocked static ports/ dirty RVSM critical area / ADC out of calibration , the wrong altitude will be displayed to both flight crew and ATC.
Presumably fixing this isn't considered a high priority as the BPS value being sent is irrelevant when flying at a FL.
But it IS relevant when flying a FL. It still happens that flight crews forget to switch to QNE during the climb. Isn't the whole point of the advisory tool to alert the ATCO in these cases?