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How do the hydraulics in an airplane have constant pressures? What is creating resistance to the pump flow to create constant pressure?

The hydraulic system contains a pressure regulator device which maintains almost the same source pressure to the cylinders across the full range of flow rate demands, regardless of what the pressure ...
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Why doesn’t ACARS just use HF if it has better range than VHF?

The main concern is that radio spectrum is a shared resource, meaning that while you’re using it, nobody else within the range of your transmission can use it too. That means you always want to use a ...
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