In the previous two chapters, production methods were dealt with and the resulting product was isolated, tested and certified as meeting the required specification. The product, however, is still within the refinery, and the next stage is to move the product towards the aircraft where it will be used. In doing so, it is most important that it does not become contaminated with dirt, water or any other product. To ensure that this does not happen or, should it do so, that the contamination is detected and the product not used in aircraft, a strict handling procedure is observed.
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