Search Results

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.

In the past, civil aircraft were assessed for electromagnetic compatibility in terms of the ability of onboard systems to coexist without incompatibility problems. However with the advent of electronic into safety critical systems on a new generation of civil aircraft, the aviation authorities became concerned about the potential interference effects of High Interference Radiated Fields (HIRF). The HIRF is generated by emission groups located in aircrafts, airports, ship/boat, such as antennas, radar, navigation/communications instruments, transmitters, among others. The results of interaction of the external electromagnetic fields with aircraft structure and electric-electronic systems herein installed can be generate a high intensity of voltage and current transients, occasioning hazard to electronic equipments and operational reliability.