Where are hydrostatic test dates typically recorded?

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Hydrostatic test dates are typically recorded on metal bands that are affixed to pressure cylinders. These bands are durable and designed to withstand the environmental conditions that the cylinders may encounter, ensuring that the information remains legible and intact over time. The metal band provides a reliable means of marking the date when the cylinder was last tested for safety and integrity, which is critical in aviation where handling high-pressure gases is involved.

While some information may appear on labels or documents, the metal bands serve a crucial role in ensuring that the test information is immediately visible and accessible for personnel who need to verify the cylinder's safety status quickly.