Australia has numerous differences to US rules & regs, one of which concerns one inop. missed approaches. The rules state, in part, that the approach must not be commenced unless the 2.5% missed approach gradient can be met *or* adjust the MDA accordingly.
So, no, the pilot is not expected to calculate it during the missed but prior to commencement of the approach.
To continue with another example that something you wrote made me think about, Oz rules require multi-engine IFR aircraft to have at least a 1% climb gradient at 5000' ISA when asymmetric, unlike the US where certain Part 23 aircraft may only require climb performance 'be determined'. In Oz this has often meant a restricted MTOW, referred to as the IFR climb weight limit. VFR requires the lesser ability to maintain altitude so even then there can be a reduced MTOW compared to the same aircraft operated under US registration.
Oz used to have its own aircraft flight manual that had Oz specific performance charts. The Oz flight manual is now defunct. Since leaving Oz I haven't really kept up with changes since then so what data is now presented could well have changed.
Last edited by Tinstaafl; 8th Feb 2012 at 03:04.