E.M.Ps

Just been watching a program on T.V. regarding the effects that an EMP bomb would do to electrical systems, should one go off.
It made me think, if an EMP bomb were to be set off at our Air Bases, what the effect on the aircrafts PCBs be, and could they be made to fly manualy.
What sort of attack would that have on our air defence systems?.
Jim.
Lincoln .7