BULL!!!!!
At YBAS 061800Z 27005KT CAVOK 03/M05 Q1022 would mean a DA of 528', granted it was OAT of 3C.
If it was 73C it might be 8000'. Even in really extreme conditions - say QNH 990 OAT 50C and DP 45C it would just crack 8000'.
Which books have you been reading or are you taking the p*ss?
Where I landed the other day it was 10,300, OAT+10, QNH 1002, DP 8 = 12,629.
Accurate enough is 30' per mb deviation good or bad from ISA MSL pressure and 120' per degree C from ISA MSL temp.
Give back your licence immediately or get this right before venturing into the higher landing spots, at least your error might keep you out of the poo!