MDA is the legal planning altitude.
Airlines including my current one also add 50 ft on the ND and the MCP rounded up to the next 100.
So an MDA of 410ft will become 460ft on the ND and 500 ft on the MCP.
The call out of minimums will be at 460ft,a loss of 20-30 ft is expected during a normal go around maneuver.
50 ft altitude is about 150 meters extra vis required to the minimum vis associated with to the MDA.
Last edited by de facto; 8th Mar 2013 at 03:18.