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Learn about the rules that govern the classification of goods under the Harmonized Commodity Description and Coding System (HS). The web page explains the six general rules, their application, and provides external links for more information.
The Harmonized System (HS) is an internationally standardized system of names and numbers to classify traded products. It is used by over 200 countries and economies for customs tariffs, trade statistics and other purposes. Learn about its structure, classification and revisions.
Hexadecimal is a positional numeral system that uses sixteen symbols, usually "0"–"9" and "A"–"F", to represent numbers. It is widely used in computing and mathematics to represent binary-coded values or large decimal numbers.
ATA 100 is a standard referencing system for commercial aircraft documentation, published by the Air Transport Association in 1956. It consists of two-digit chapters and sections that cover various aspects of aircraft systems, structure, and operations.
Learn about the different modes of aviation transponders, which transmit information to radar systems and ADS-B receivers. Mode C provides the aircraft's pressure altitude, which is usually combined with Mode 3/A to provide a 4-digit octal code and altitude as Mode A and C.
Binary-coded decimal (BCD) is a binary encoding of decimal numbers where each digit is represented by a fixed number of bits, usually four or eight. Learn about the different types of BCD, their advantages and disadvantages, and their applications in computing and electronic systems.
Only a subset of possible combinations are possible, with the complete 0 to 7 for the first digit but only 0 to 3 for the second, allowing 32 codes between 00 and 73. This is sometimes known as the "mission signal" and set by the air controllers prior to flight. In Mode 2 and 3, all 4096 possible 4-digit codes from 0000 to 7777 are allowed. [21]
IFF is a combat identification system that uses a transponder to respond to radar signals and identify friendly or hostile forces. Learn about the history, types and modes of IFF, and how it works with different frequencies and formats.