Increased air noise in Oakville neighbourhoods is the direct result of two changes to the NAV CANADA redesign :
The changes to STARS at Toronto Pearson (YYZ), created new arrival procedures that require aircraft to fly at lower altitudes and slower speeds when approaching. In addition, aircraft are now required to begin descent procedures farther afield than previously. This is known as early descent.
The results of these changes:
Early descents cause aircraft to level off at low altitudes, creating a need for power. Lower speeds create a need to
use flaps. The extra drag flaps generate creates a need for even more power.
YYZ STARs create all of these conditions, almost entirely over densely populated areas.
A perfect storm of noise.
Major factors that create or increase noise caused by transport aircraft include ...
● Flap setting
● Power setting
● Speedbrake use
● Geographic position