Originally Posted by Underfire
Isnt it based on Final approach speed?
Assuming Australia operates to PANS-OPS, it's got nothing to do with final approach speed. The speed that determines the category is Vat, which is normally 1.3Vs. Our "approach" speed is Vat+5kts (not 737 but "normal" big jet ops, I suspect). So the 737 "Final Approach Speed" could be 145 and still be Cat C. I stand to be corrected though.