Originally Posted by
kiiga
So basically if you are below the clouds and below circling MDA - do missed approach ... I guess. Looks like the book is wrong ...
Why do a missed approach if you're already below the clouds and visual? Once you're visual, you may then continue to
descend below the MDA, as outlined by ENR 1.5 - 1.7.3 for a circle to land.
Originally Posted by kiiga
Yet, two pages later [ENR 1.5 par 1.10.1(d)] AIR says:
A missed approach must be executed if: ...
d) a landing cannot be effected from a runway approach, unless a
circling approach can be conducted in weather conditionsequal to or better than those specified for circling;
This is in reference to using an aid for a runway approach (eg, an ILS or LLZ), but due to excessive crosswinds, you can not effect a landing on that runway approach. So what you do is descend to the circling minima instead (and not the ILS or LLZ minima) and conduct a circling approach to land on a runway that's more suited to the wind direction.
Those who fly to Essendon would be familiar with this when strong southerlies are blowing whilst conducting an ILS on Runway 26. You conduct the Runway 26 ILS as normal but discontinue the descent at the circling minima and then break right for a circling approach for Runway 17.