Many surveyors don't have any idea what that 1A should look like so they are lost. The cost to do a 1A and 2C is the same and their accuracy exceeds both of those requirements. If you need an example letter I produced and have had successfully filed and completed the process with I can send you one.
On Wed, Apr 15, 2020 at 2:20 PM Brian Webster <i...@wirelessmapping.com> wrote: > Tim is correct. TOWAIR will err on the conservative side so that if > something is a close call, it will defer that decision to the FAA to do > their precise study. A couple of key things to note. If you do have to > file, always get a 1A qualified survey letter and send it with your > application for study. This will allow the FAA to know that the vertical > margin of error for the elevation information you filled in can only be 3 > feet. If you file a 2C survey letter they still assume a 20 foot vertical > margin of error and they add that to your structure height. If you don’t > supply either letter I think they add 50ft to your applied for height. Of > other additional note, your state DOT and the local airport authority > actually have more authority to require marking and lighting if they deem > it necessary. When you file for an FAA determination, the FAA forwards your > request to them for review as well. I had a tower application actually come > back clear from the FAA but the Washington State DOT (aeronautical > division) require that the tower be marked and lit. Most people don’t know > that this can happen. > > > > If you want to study it quietly to know if you are possibly in violation, > check with the folks at www.airspaceusa.com. They can run all the same > studies the FAA will. > > > > Part of any FAA study is not only height clearance but they do study for > RFI and possible radar blockages. RFI specifically as it might apply to any > radio navigation systems. Technically if you add any transmitter to a tower > that did not have those frequencies in the original application, you need > to file again even if you don’t change the height so that they can do an > RFI study again. > > > > Thank you, > > Brian Webster > > www.wirelessmapping.com > > > > *From:* AF [mailto:af-boun...@af.afmug.com] *On Behalf Of *Tim Hardy > *Sent:* Wednesday, April 15, 2020 11:59 AM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] TOWAIR and ASR for existing tower > > > > The FAA Notice Criteria tool mentioned by Lewis is also more accurate than > TOWAIR and we have seen instances where it will clear towers that TOWAIR > failed. All we had to do was file the FAA Report data along with the > TOWAIR data and the application was accepted. > > > > On Apr 14, 2020, at 7:45 PM, Lewis Bergman <lewis.berg...@gmail.com> > wrote: > > > > The FAA had a tool to determine if you have to file. > > > https://oeaaa.faa.gov/oeaaa/external/gisTools/gisAction.jsp?action=showNoNoticeRequiredToolForm > > > > On Tue, Apr 14, 2020, 5:47 PM Ken Hohhof <af...@kwisp.com> wrote: > > We have a tower next to a commercial building, I think it’s a 45 or 50 ft > probably Rohn 45G. It is near a smallish regional airport but pretty much > 90 degrees to the runway. We need to swap out the 5 GHz backhaul links on > this tower for licensed. > > > > The frequency coordinator is telling us that according to TOWAIR we need > to file for an ASR, I assume they mean not just with the FCC but with the > FAA. > > > > By doing so, are we opening Pandora’s box, where they tell us not only is > our request denied, we have to take down the tower that has been there for > 20 years? Is this one of those things where we will really regret asking > the question and should have just kept quiet and suffered with the 5 GHz > interference? > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Lewis Bergman 325-439-0533 Cell
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