Updated: Jun 14
For years our MB representatives have said that you would not support any noise mitigation approach that would shift noise south, even if it was a very small change. As a result, we missed an opportunity in the Flight Procedures Analysis to help your fellow residents. Now we will see if your representatives can make up for your past mistakes by stepping aside and allowing others in the community to represent the best interests of our residents.
The picture below is from a 1988 Part 150 Study. You can see the there are two departures, one on 275 and one on 290 degrees. Actually the theoretical 290 line passes over the most southern tip of Mission Beach. But pilots with destinations north began cutting the corner, creeping north. The average for the north bound flights shown here is actually 295 degrees. The only benefit here is that the aircraft are fanned out over South Mission Beach rather than concentrated over Klaus's house, or my house.
Rather than pull the airlines back to 290 as they have should, they, the Port, changed the departure procedure from 290 to 293. And it gets worse. When the NexGen came along, again, instead of defining a track that passed through 290, they designed PADRZ with software that turns the aircraft to even steeper angles, as much as 300, before turning the aircraft back to a lower angle to intercept the waypoint, WNFLD, in the ocean.
The picture below shows the average crossing points (yellow pins on chart above) and dispersion for the 290 and PADRZ. The two shortened blue lines show where the current average crossing point is for the 290 vector departures relative to the southern tip of Mission Beach (0.0). Putting a flyover waypoint at the southern tip of Mission Beach would greatly increase the accuracy of the 290 departure, moving the average of the red lines back to the 290 at 0.0 and substantially reducing the dispersion.
In the picture below, the lime green line is the 290 degree vector from a point on the 275 more than a mile from the end of the runway. The shaded out white area shows the dispersion for the 290 degree vector nighttime noise abatement procedure.
The top yellow pin shows the average crossing point over Mission Beach for the PADRZ SID. The second yellow pin below the first one shows the average crossing point for the 290 nighttime departure. Both of these pins are well above the crossing point for the green line at the most southern tip of Mission Beach.
Several alternatives being considered by the airport authority consultants follow the green line closely, but cause a slight shift in the 65 dB CNEL contour to the south. These ideas are being rejected for the wrong reason, given that the original and correct crossing point over Mission Beach should always have been the 290 degree vector, the green line.
The worst part is that the Airport Authority is pushing for all of the departures to be on one of two procedures, the ZZOOO, on the 275, or PADRZ, currently on 295. The residents of Mission Beach need to push back.
To rectify past injustices, a new waypoint needs to be defined at the very southern tip of SMB for PADRZ. In addition, a decision needs to be made whether to allow the illegal shift of the nighttime departures from 275 to 290 or to continue to allow this shift, but with some allowances for insulation in Mission Beach.