However, compliance with the above is no guarantee that an airplane will be able to extract from an IFR approach simply by flying the (all engines) published missed approach procedure after losing an engine. That calculation is left to the operator and its provider of performance engineering/analysis.
Exactly. Try using the numbers in the AFM at Bangda, Lhasa, or Cuzco.
The AC was published specifically to detail that the missed approach shown on the charts is NOT EO. While you MAY be able to meet the 2.5% requirement, the obstacle clearance surface and ROC is designed for all engine missed.
I am currently designing RNP approaches into Bandga, are you saying I should stick with the AFM climb gradients of 2.5%?.... how 'innovative'
Look at it this way, you are on final airport elevation near 5000, temp 25C, flaps 30 or 40...down to Vref around 140kts, so almost all of your energy is gone, and lose an engine. You now have to get the engine spooled up, all the bleed/icing etc off, balanced and to flaps 1 (the AFM basis for climb)...and not drop below the MDA...and is your climb near 2.5%