The EC 130 B4 complies with the new environmental requirements: low external noise emission pollution. External noise emission according to ICAO Annex 16 Chapter 11: < 84,3dB SEL in fly-over condition at Max Gross Weight, i.e. – 8.5dB better than ICAO requirement. Low external noise thanks to its low noise “Fenestron™” . Automatic control of rotor RPM in order to optimize noise signature in overflight without operational limitations.