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The last Electronics store.


robothut

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Spend a weekend in there ! The IFF he mentions is not there. It would be mode 4.  Early every morning an avionics tech would step up to the aircraft,,open panel 3L,,pull a classified  encrypted challenge key,,open the transponder and load the top secret code for that day. All branches of the service and allies would be afforded the same key for the missions that day. We called it Kit and Kir . https://aviation.stackexchange.com/questions/95909/what-does-mode-four-check-mean#:~:text=Mode 4 is one of several modes of,entities%2C is entered into the IFF control head.

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