A recent tweet shared a new term: ‘Noise Canyons’. Evidently, the UK aviation authority, CAA, has adopted this term to describe the narrow corridors on the ground that are most impacted by newly deployed precision airline routes.
The image above comes from page 7 of the 17-page report, ‘Airspace Change Process & Airspace Trials in the context of Modernising UK Airspace’. Here’s a link to an archived copy of the report, which was created by Dr. Darren Rhodes, Head of the Environmental Research and Consultancy Department (ERCD) at UK’s Civil Aviation Authority (CAA). The report is well worth studying, even in the U.S., as the technologies as well as the implementation strategies (and failures) are of a global scope.
Why Are We Seeing These New ‘Noise Canyons’?
Under the ‘NextGen’ label, FAA (and in the UK, CAA) is using GPS-based aircraft automation systems to set up new routes, ostensibly to trim a few more miles, to shorten flight routes to the absolute minimum distances possible. In reality, the NextGen program is just a wholesale abandonment of the noise mitigation procedures that have existed for decades to minimize noise and pollution impacts upon community residents.
Of course, GPS has been effectively used for more than two decades. Moreover, GPS was preceded by inertial navigational systems, which have allowed airlines/ATC to use long direct routes for more than four decades. Despite this fact, the industry propaganda being foisted by Av-Gov complex players keeps trying to fool elected officials and the general public into believing NextGen has ‘benefits’ such as the straightening of routes. That is bunk. The only ‘shortening’ is happening near the airports, and ONLY due to wholesale abandonment of decades-old noise mitigation procedures.
And one more thing: the shortening near airports is often for naught. Time and time again, online flight tracking websites are showing enroute delays at cruise altitude. The real problem is simply overscheduling at major hub airports; i.e., FAA and other aviation regulators are doing nothing to stop airlines from trying put too many arrivals into too little time. When the arrival queue becomes too full, ATC needs to issue delays; so, flights are routinely issued large turns while cruising at altitude, to delay their arrival.
Silly, isn’t it. If FAA really wanted to minimize distances flown and fuel burned, the solution is easy: scale back the hub airports to flow rates that ensure enroute delays are needed only in the most extreme situations (not hourly, not hourly, but perhaps every few months or so).