Oz rules specify that the MDA/DA must be adjusted if the a/c would be incapable of achieving 2.5%
All very good. But to do this, you will need to know where the critical obstacles are, so you can work back from them at the actual climb gradient, and determine your new single-engine MDA.
This information is not in the ordinary approach plates. How many flying schools purchase the missed approach terrain survey maps from the certifying authority, just to do this calculation?
Two further complications:
a) The "ordinary" MDA may not be climb gradient restricted, but restricted for some other reason, such as not below 300' agl at the missed approach point. (This would be the case where a missed approach takes you over water or flat ground, with a turn at a non-specified distance to return to the airfield hold).
b) Your clapped out light twin may be incapable of climbing to, or maintaining, altitude in the missed approach hold when asymmetric. In that case, what's the point of doing the missed approach at all? If asymmetric in IMC, you are effectively committed to land from the initial approach point.
Food for thought, I'd welcome corrections.
O8
