Thank you 'FlightPathOBN' for the detail. I will add to my sim sessions when this topic comes up.
The link below to Transport Canada shows how it is handled in Canada.
A specific exemption is given ... 'R745,47 - Exemption from respecting MDA.'
R745.47 - Exemption from respecting MDA:
(a) this guidance applies to non-precision approach operations using FMS approach slope or other stabilized approach angle techniques;
(b) CAR 602.128 (2)(b) forbids descent below minimum descent altitude (MDA) during a non-precision approach unless the required visual reference has been established;
(c) an exemption to this regulation is available to turbo-jet aircraft with over 100,000 lbs. take-off gross weight if the air operator is using stabilized approach angle techniques, provided that certain conditions are met. This exemption permits pilots to treat MDA as a DH;
(d) all air operators who are not exempted from the requirements of CAR 602.128 (2)(b) must conduct non-precision approaches in such a way that the aircraft does not descend below the published MDA unless the required visual reference has been established (with due allowance for momentary variations during turbulent conditions). These air operators would be considered to be "respecting MDA" only if their operational procedures, training and checking programs required pilots to maintain an altitude at or above the published MDA prior to establishing visual reference;
There are several conditions for exemption. One of the conditions...
"(ii) the air operator must have procedures in place
to ensure that pilots will add a specified amount to MDA that will compensate for the additional height loss during the go-around initiation during approaches where:
(A) there is a failure of an aircraft system that would affect the aircraft height loss during the initiation of a missed approach;
(B) the aircraft is above normal maximum landing weight;
(C) the aircraft landing weight is limited by aborted landing climb performance; or
(D) any other situation where a larger than normal height loss during the initiation of a missed approach could be expected;..."
Division III - Flight Operations - Transport Canada
(scroll link to the bottom for full text of 'R745.47')
In my experience, depending on the operator, a standard addition of 'a specified amount to MDA' used on the A330/A340 has been 50'
Cheers