Hey Propellerhead & Iz; does "XL" rings a bell? Now for the rest of us; in my company's SOPs is nothing to be found about adding 50 ft. to the MDA. However we fly a non precision approach stabalized on a 3 degree glide path (at least some try to). Going below your MDA during a go-around is a bust and a failure, so what most pilots do (and it,s not written down), is to add approx. 50 ft. to the MDA and innitiate the go-around at that altitude to prevent busting the MDA. The "50 ft.- rule" works for most turboprops and jets. Hope this helped.
Greez, E.