What is the limit for maximum allowable noise level for the ERJ 170/175?

The maximum allowable noise level for the ERJ 170/175 is set at 85 dB (A). This threshold is critical for ensuring compliance with international noise regulations, which aim to minimize the impact of aircraft operations on communities surrounding airports. Adhering to this limit helps maintain the balance between aviation activities and environmental considerations.

Aircraft noise levels are measured in decibels (dB), which represents a logarithmic scale of intensity. The 'A' weighting denotes that the measurement accounts for the way the human ear perceives different frequencies of sound, making it particularly relevant for assessing environmental noise impact. The ERJ 170/175 complies with these standards, which are often dictated by agencies such as the FAA and ICAO, to promote quieter operations and improve community relations near airfields.

It is important to understand that the other options exceed the established noise level limits. For instance, levels above 85 dB (A) would not only breach regulatory requirements but also potentially lead to increased restrictions on operations at certain airports or during specific times, adversely affecting scheduling and operational flexibility.