This research investigated how steel nets used as reinforcement in taxiways and runways affect systems on board aircraft. It is stated that for High Intensity Radiated Fields from radio- or radar transmitters, steel nets have a smoothening effect and therefore decrease the risk of interference with aircraft systems. For aircraft compasses it is concluded that permanently magnetic steel nets constitute a significant source of interference. It was further concluded that steel nets, typically used as reinforcement, have such properties that they do not become permanently magnetic and consequently there is no risk of interference with aircraft compasses. Diverging compasses at Arlanda airport are explained as a consequence of using permanently magnetic steel nets of non-typical quality.

This report is a short version of the Swedish VTI notat 13-2004, "Stålarmering i flygfält - kan stålnät i banor påverka flygplansinstrument?"