Which two phases are cited as the main areas of noise concerns during the flight phase?

Which two phases are cited as the main areas of noise concerns during the flight phase?

• A. Final approach and initial climb
• B. Cruising altitude and descent
• C. Takeoff roll and landing roll
• D. Taxi and ground operation

Answer: (A)

The main idea is that noise impact is greatest when the aircraft is close to the ground and using high thrust. During the flight phase, the periods with the most ground noise are when the airplane is climbing after takeoff (initial climb) and when it’s approaching for landing (final approach). In these phases the aircraft is typically at low altitude near populated areas, and the engines may be at high power settings and configured for ascent or descent, which amplifies the sound perceived on the ground. Cruising altitude occurs much higher up, so the sound attenuates over distance and is less noticeable on the ground. Taxi and ground operations happen on the ground and are not part of the flight-phase noise concerns.

The main idea is that noise impact is greatest when the aircraft is close to the ground and using high thrust. During the flight phase, the periods with the most ground noise are when the airplane is climbing after takeoff (initial climb) and when it’s approaching for landing (final approach). In these phases the aircraft is typically at low altitude near populated areas, and the engines may be at high power settings and configured for ascent or descent, which amplifies the sound perceived on the ground.

Cruising altitude occurs much higher up, so the sound attenuates over distance and is less noticeable on the ground. Taxi and ground operations happen on the ground and are not part of the flight-phase noise concerns.