I tend to agree with Porter. Crappy design.
A few rough estimates;
At 400 ft they’d be about 1200m from the MAPT as the crow flies.
They’d be doing maybe 82m/sec.
Time how long it takes you to say
ATC : “Qantas 123 this isn’t going to work, carry out the standard missed approach procedure”
QF: “ Ahhh understood standard missed approach procedure, Qantas 123 going round”
PF “ Righto, we’re gunna go round”
PM “ Yip”
PF “ Going round Flap fifteen”
three second pause for the actions
PM” positive rate”
PF “ gear up”
It takes me between 17 and 20 seconds if I do it at a pace I think is realistic/likely.
So now you’re 400m past the MAPT climbing back through 400ft and doing exactly as the procedure calls for, tracking 335 waiting for 600ft where you’ll begin your turn onto 070. How long does that take? 200ft at 1000fpm is another 12 seconds and 980m. So now, after flying the machine nicely, you’re 1.4km past the MAPT.
So my thoughts are that if everything goes really well, you’re going to be over the runway when you turn but very likely is that you’re going to be well down the runway as things rarely go exactly to plan. All it would take is one drawn out communication and you are turning where this aircraft turned having done the job very nicely.