On-line (real-time) control systems, instrumentation (including sensors) or automated data acquisition and processing equipment, specially designed for use in wind tunnels designed for speeds of Mach 1,2 or more.

On-line (real time) control systems, instrumentation (including sensors) or automated data acquisition and processing equipment, specially designed for use with any of the following: N.B.: SEE ALSO 9B105. a. Wind tunnels designed for speeds of Mach 1,2 or more; Note: 9B005.a. does not control wind tunnels specially designed for educational purposes and having a ‘test section size’ (measured laterally) of less than 250 mm. Technical Note: ‘Test section size’ means the diameter of the circle, or the side of the square, or the longest side of the rectangle, at the largest test section location. b. Devices for simulating flow-environments at speeds exceeding Mach 5, including hot-shot tunnels, plasma arc tunnels, shock tubes, shock tunnels, gas tunnels and light gas guns; or c. Wind tunnels or devices, other than two-dimensional sections, capable of simulating Reynolds number flows exceeding 25 × 10 6 .

On-line (real-time) control systems, instrumentation (including sensors) or automated data acquisition and processing equipment, specially designed for use in wind tunnels designed for speeds of Mach 1,2 or more.

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