From:            Bernedine Lund
To:                Commission-Public-Records
Subject:           [EXTERNAL] Commissioner meeting today - public comment
Date:              Tuesday, March 9, 2021 7:51:04 AM

WARNING: External email. Links or attachments may be unsafe.
Hello,
I would like to make a verbal public comment and have attached a copy of what I plan
to say - it has three pictures on the second page that will help the Commissioners see
the effect of the dispersion of the flight paths.
Can I do both the verbal comment and have the written comment as well? If not, I
would rather just have the written comment included in the packet.
Thank you.
Bernedine Lund

3-9-2021 PoS Commissioner's meeting, Public Comment, Bernedine Lund, resident of Federal Way,
member of QSPS and volunteer for 350 Seattle Aviation Group 

Hello, Commissioners, 
On Feb 23-26, I attended the virtual presentation of the Aviation Noise & Emissions Symposium 2021.
The first presentation was on dispersion of flight departures as a way to reduce the constant noise
created by overhead flights. In the presentation an example dispersion of flight tracks at Charlotte
Douglas Int airport was shown in before and after dispersion pictures. The dispersion effected about
308 flights, with the before flight path about 1.6 miles across widening to 2.5 miles, and further out the
width went from 3.2 miles across to 6 miles across.  See the attached before (2014) and after (2019)
pictures. The before picture reminded me of the picture of the departure flight paths going over noise
monitor 22 that I included in my written public comment on Feb. 23. See attached 3rd picture.
The similarities in the two different before pictures is striking, in that the flight paths were well defined
in the before picture. The after picture shows much more spread out fl ight paths so that you do not
have single lane flight paths. This made me made me wonder if you have ever considered asking the
FAA to disperse the departing flight paths The FAA authorization of 2018, Section 175, gives airports
the right to make such a request for departing flights paths. Note that the dispersion does not apply to
flight approaches. Below is a copy of the slide from the FAA presentation listing the 3 conditions
needed to request dispersion of the departure flight paths. 









Next page has the 3 pictures.

Charlotte Douglas International Airport  before and after dispersion 










SeaTac South Flow Departures over two noise monitors 22 and A002 in Federal Way