Re QF training at Avalon. Heard plenty of it in pre sim days- You could always tell how many engines the 707 had running in the circuit from the noise (at least between 4, 3 and 2) - and sometimes we suspected 1 as:
more noise
often longer between circuits (extend downwind for restart?)
By the Matric exams hardly noticed it.
Maybe I should sue QF for the nice letter from Dr Ruth? from DCA - something like "while I have issued you a Class 1 medical the hearing tests indicates you have severe noise deafness and this will get worse as you age. You should consider your career options"