Well, are you talking about the CDFA - Continuous Descent Final Approach?
MDA 650' includes a crossing altitude (1180') at 3.4 nm, but the DME must be operational, otherwise MDA 1330' has to be used. Note: there is an obstacle (1074') about 3-4 NM on final, and 256' is barely a narrow margin to avoid it.
Cheers.