What makes an aircraft flying overhead noisier?
December 17, 2013 9:36 AM Subscribe
I've been doing research on jet aircraft noise over urban areas. And, while I've uncovered some very clear explanations of the different types of aircraft noise
to share with others, there are some questions that still are eluding my Google foo. I'm looking for resources that will help me to answer a variety of specific questions about aircraft noise, whether they are discussion groups or specific authors of research papers, etc.
The kinds of questions I'm seeking resources for are all related to aircraft noise, but can be somewhat different. For example:
posted by jeanmari to Grab Bag (5 answers total) 2 users marked this as a favorite
1) I'm familiar now with the 4 Stages of aircraft noise certification, but it isn't clear to me what--if any--real improvements that Stage 4 aircraft will bring, especially when you consider arrival, lateral and departure noise separately? I've been pouring over the FAA documents but a clear explanation of this is really difficult to find.
2) I know that airframe noise can significantly increase the overall noise that listeners experience on the ground. And that airframe noise is related to how the aircraft is designed AS WELL AS how a pilot flies the plane. But there is less information about how noise levels increase with different plane maneuvers. Like bringing the landing gear down early. Or making a crosswind landing
3) Aircraft choices made by pilots because of the instructions given to them by air traffic controllers. What choices increase noise? Using landing gear to slow a plane? Requiring pilots to keep landing gear up until necessary for landing prep? Avoiding crosswind landings? Using CDA versus step down approaches and how this is implemented?
It's difficult to find sources for this specific type of information...perhaps a commercial pilot would know?
My specific context is O'Hare airport. 4 parallel runways, with up to three planes arriving at the same time in parallel (fewer parallel operations for departures.)