This standard specifies the general technical requirements for civil aviation non-directional beacon (NDB) equipment. It is the basis for the planning, update, design, manufacturing, inspection and operation of civil aviation non-directional beacon equipment. This standard applies to all types of ground non-directional beacon equipment in the civil aviation industry.
MH/T 4006.4-1998 history
1998MH/T 4006.4-1998 Aeronautical radio navigation aids.Part 4:Technical requirements for non-directional radio beacon(NDB)