Principal function governs classification of a helium leak detection system under heading 9031, defeating the customs exemption claim.

A composite helium leak testing system was classified by applying its principal function under Chapter Note 3 to Chapter 90 and Notes 3 and 4 to Section XVI. Because the machine detected leakage by identifying traces of helium, and did not itself measure the flow, level, pressure or other variables of liquids or gases, heading 9026 was rejected. Heading 9031, covering measuring or checking instruments, appliances and machines not specified elsewhere, was held to be the correct classification. As a result, the claimed exemption under Notification No. 24/2005-Cus. was not available.

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Issues: Whether the imported helium leak testing machine was classifiable under heading 9026 as an instrument or apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases, or under heading 9031 as a measuring or checking machine not specified elsewhere, and whether exemption under Notification No. 24/2005-Cus. was admissible.

Analysis: The technical literature and the chartered engineer's opinion showed that the imported item was a composite system made up of several instruments, apparatus and devices, functioning as a machine for leak detection. On the application of Chapter Note 3 to Chapter 90 and Notes 3 and 4 to Section XVI, the principal function of the whole system had to govern classification. The item was found not to measure the flow, level, pressure or other variables of liquids or gases within heading 9026, but to detect leakage by identifying traces of helium in the test chamber. Heading 9031, which covers measuring or checking instruments, appliances and machines not specified elsewhere, was therefore held to be the appropriate classification. Once so classified, the claimed exemption under Notification No. 24/2005-Cus. was not available.

Conclusion: The imported goods were correctly classified under heading 9031, and the exemption claim failed.

Ratio Decidendi: A composite imported system must be classified according to its principal function, and a leak-detection machine that does not itself measure the flow, level, pressure or other variables of liquids or gases is classifiable under heading 9031 rather than heading 9026.

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