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The coupling elements of aircraft instruments are of manydifferent designs depending on the instruments own design and use. Pneumatic pressures from static and pitot systems are used for airspeed indicators and older models are plumbed. Altitude uses the static system only but is also plumbed. We could go through all the flight and engine instruments but I have the feeling you are looking for the most common answer, CANNON PLUGS. Cannon plugs are hermetically sealed pin and receptor connections that screw together only when properly aligned. The cannon plug has been around a very long time.

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14y ago
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Q: What is the coupling element of an aircraft instrument?
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