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The electro-electronic equipments of the aircraft are involved by electromagnetic fields which are inherent to the normal operation of installed equipment/systems, like radar and transmitters or hydraulic and fuel pumps. There are several systems and equipment that are inherently emissive, like VHP transmitters and weather radar, and there are several other that are inherently or by design potentially sensitive to a wide range of frequencies. Overall electromagnetic compatibility of operation must be achieved for all equipment installed in the aircraft and this concern is first applicable in terms of simultaneous operation of the aircraft installed equipment. The objective of this work is present and discusses the EMI effects and, subsequent, possible EMI protection employed in aircrafts, establishing minimal control of all of these effects with no hazard to flight safety and operational reliability.