Electromagnetic interference evaluation of an intercommunications system on a Navy aircraft

The intercommunications system (ICS) on a Navy aircraft was evaluated for numerous electromagnetic interference (EMI) problems that had been reported during use in the Fleet. As a nondevelopmental item (NDI) for the Navy, very little EMI testing had been performed. Though this was not a typical Navy program, it was a real life example of the problems that can be caused by not adhering to the EMI requirements. This paper discusses the testing performed, including some innovative testing using reverberation techniques inside the aircraft and also outside the aircraft in a shielded hangar