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How are VC-25A electronics protected from the electromagnetic pulse of a nuclear explosion?

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Mount Rushmore and Air Force One — Air Force One Air Force One, a Boeing 747 reserved for use by the president of the United States, flying over Mount Rushmore, South Dakota.

The VC-25A aircraft, which serve as Air Force One, are equipped with classified security and defense systems specifically designed to protect their onboard electronics against the electromagnetic pulse (EMP) generated by a nuclear explosion.1

While the specific technical details of these measures remain classified, such protective procedures are generally referred to as "hardening". Hardening is the process of improving the ability of electronic networks and military command and control systems to withstand the intense electromagnetic radiation and induced currents caused by an EMP. By implementing these measures, the aircraft ensures that its critical communication and operational systems remain functional even in the event of a nuclear detonation.231