MABH
The following is extracted from Airbus getting to grips with CAT II / CAT III operations ...
2.7 MINIMUM APPROACH BREAK-OFF HEIGHT
The Minimum Approach Break-off Height (MABH) is the lowest height above the ground, measured by radio-altimeter, such that if a missed approach is initiated without external references:
− in normal operation, the aircraft does not touch the ground during the procedure ; − with an engine failure during a missed approach, it can be demonstrated that taking this failure probability, an accident is extremely improbable.
This definition is not considered by the FAA and is abandoned by JAA following the harmonization process of the AWO regulations.
The MABH will remain indicated in some Airbus AFM (except FAA AFM).
For some Airbus type the MABH is replaced by an indication of the minimum DH and for more recent certifications the MABH will be replaced in the procedure section of the AFM by an indication of the altitude loss during automatic go around.
The MABH or the altitude loss during automatic go around can be used by the airlines to determine the minimum DH in CAT III operation.