For many years it was considered ‘risky’ to install electrically operated shading systems in Air Traffic Control Tower Cabs or VCR’s (Visual Control Rooms).
The main reason was that shades/blinds had to have the ability to be raised very quickly if clear visibility was needed in case of an emergency, so manually operated systems were the norm.
Norms don’t seem to change very quickly, regardless of the advance of moderns materials. We have to bear in mind in those days the air traffic controllers had to make do with shades that were almost impossible to see through. That has all changed over the last 20 or so years.
98% of the systems we now install in towers Worldwide are motorised by either 24V DC motors or 110V AC/ 220V AC motors, depending on the sizes of the units and local supplies.
The reason shades/blinds do not have to be raised quickly anymore is because the materials used these days are practically transparent, allowing controllers full visibility but without the glare and dazzle issues normally associated with VCR’s.
We have two different ‘daylight filters’ available with the Type AR760 being the most widely used one and has become more or less the industry standard.
The slightly darker AR762 would only be used in extreme situations like the Arctic or Ant-
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