Final answer:
The minimum required system function for B-RNAV/RNAV 5 operations is a Multi-sensor navigation system, which integrates multiple navigation sources to ensure accuracy and redundancy.
Step-by-step explanation:
The minimum required system function for conducting B-RNAV/RNAV 5 operations is d) Multi-sensor navigation system. Basic Area Navigation (B-RNAV), also known as RNAV 5, allows aircraft to fly on any desired flight path within the coverage of ground- or space-based navigation aids, within the limits of the capability of the self-contained aircraft navigation systems, or a combination of both.
This type of navigation does not rely on any single navigation source such as GPS or Inertial Navigation System (INS) but often integrates data from multiple sources to provide the most accurate navigation information possible, which is essential for the B-RNAV/RNAV 5 operations. This integration enhances redundancy and allows the aircraft to continue operating safely even if one of the navigation sources fails.