R.A.N.G.O - Residents' Air Noise Group of Oakville

Welcome

What Happened in Oakville?

Increased air noise in Oakville neighbourhoods is the direct result of two changes to the NAV CANADA redesign :

  • the path was moved 2 km south
  • the procedures used by aircraft in landing, known as S.T.A.R.s ( standard terminal arrival route) were revised.

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:

  • Aircraft are flying lower than needed, earlier in the descent.
  • YYZ STARs unnecessarily force aircraft to slow down to speeds that require use of flaps. Flaps create significant noise and can often be confused with engine noise, as flaps have a ripping effect on the air they
    pass through.
  • Power settings increase.  The use of flaps caused by slower speed requires more power to overcome the additional drag, adding even more noise. 
  • Speedbrakes are often needed. They are not as noisy as flaps, but do create some noise especially when flaps are extended.
  • Unnecessary additional distance. This wastes fuel and results in more emissions.


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. 

The Issues.

Causes of Air Noise

Major factors that create or increase noise caused by transport aircraft include ...
● Altitude
● Flap setting
● Power setting
● Speedbrake use
● Geographic position