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Re: Diorama Henschel HS-123
Außenbordanschluss is the receptacle for a ground power unit. In this case electric. Usually used to power all the systems in an aircraft while the engine driven genarator is not available and for engine starts to save the charge of the onboard battery. Some installations allower the on board battery to recharched while it was hooked up.
Regards,
Norbert
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