Originally Posted by
dehg5776
Your scenario is based upon losing an aid, or being out of tolerance, yet you insist on flying to a missed approach point, at the MDA and below the MSA, prior to going around.
How do you know where the MAPt is when you have lost all reference to it?
Ask CASA. AIP ENR 1.5 1.10.2 clearly says "fly to the MAPt", but it doesn't say how. 1.11.1(c) suggests dead reckoning, but not in relation to 1.10.2.
It wasn't suggested to fly down to the MDA, but simply to level off, thus discontinuing the approach, and climbing at the MAPt. The scenario is in relation to flying out of tolerance and being required to execute a missed approach in accordance with the regs. In reality, you may be out of half-scale, but you could still get back on track to fly to the MAPt. Such a maneouvre would keep you in line with the glidepath above MDA until you reached the MAPt.
The question is, what happens in that brief moment when you fall out of tolerance (and by how much)? Again, the argument is the glide slope takes this into account, offering protection not only along the path, but just outside it - obviously up to a point - because it is common for aircraft to fly outside those tolerances on approaches.