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The A320's manual doesn't say—it doesn't have to as what is adjusted is the tension. Assuming you're asking out of curiosity and a general answer / other jet-liners would do: It's measured in sweeps/strokes (or cycles) per minute – a cycle is two sweeps/strokes. Generally it's 250 sweeps per minute, and the slow mode is 2/3 of that (that's how the typical ...

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