FlyerTalk Forums - View Single Post - What is this? (cord pulled from jetbridge onto plane) [Answer: Temperature sensor]
Old Jun 7, 2021 | 10:29 pm
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LarryJ
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It is a temperature sensor for the ground airconditioning.

When preconditioned ground air is connected to the aircraft, that sensor is placed inside of the airplane to provide cabin temperature to the ground air unit's thermostat.
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