turbantime you're right if talking about PEC.
We are required by our SOPs (widebody/longhaul) to add 50' to an MDA to make it a 'claytons' DH if you like...this seems almost universal amonst the big end of town.
It makes sense when you think about it for a second...the DH on an ILS is exactly that...Decision Height and it is perfectly acceptable to go below it slightly during the GA manouver.
An MDA is a Minimum Descent Altitude and must NOT be broken in the GA....so we add 50'. We do not have a PEC in the Boeing.
Another good question...What's the difference between DH and MDA?
Here's another one. Explain the difference between MDA and OCA?
Chuckles.