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                                                               NOTICE
                                                                     
                                    Federal Communications Commission
                                                   445 12th St., S.W.
                                               Washington, D.C. 20554
                                                                     
                                                                     
                                            Released: May 28, 1999
                                 
          ERRATUM to Public Notice Released May 26, 1999
                   TOWAIR QUERY NOW AVAILABLE 
                         THROUGH INTERNET
                                 
The Wireless Telecommunications Bureau  is  now providing public access to its TOWAIR Query
through the Internet. TOWAIR Query is a landing facility slope calculation program used to determine
whether a structure with an overall height of 200' (61 meters) or less, that does not meet the 20' (6 meter)
rule criteria, requires FAA notification and FCC registration. 

A structure meets the 20' (6 meter) rule criteria when the top-mounted antenna, tower, pole, etc. does
not exceed 20' (6 meters) above the top of the support structure.  Only support structures that were not
built for the express purpose of mounting an antenna can be considered eligible to be exempt from FAA
notification and FCC registration based on meeting the 20' (6 meter) rule criteria.  Examples of said
support structures are:  Building, Water Tower, Silo, and Utility Pole.  Any antenna structure (i.e., tower)
greater than 200' (61 meters) requires FAA notification and FCC registration.  The program calculates
the location of the structure in relation to nearby airports and runways and will determine if the structure
data will penetrate the glide slope.  A "Fail Slope" result requires FAA notification and FCC registration. 
To run the TOWAIR Query, entry of site latitude, longitude, overall (highest) height above ground
(AGL) of antenna structure INCLUDING all appurtenances (antennas, dishes, lightning rods, obstruction
lighting, etc.) and elevation of site above mean sea level is required.

TOWAIR Query can be accessed from the Wireless Bureau homepage at http://www.fcc.gov/wtb by
selecting Databases.  Click on Search the Wireless Databases Online, then TOWAIR Query.  Access to
TOWAIR Query is also available through the World Wide Web at http://gullfoss.fcc.gov:8080/cgi-
bin/ws.exe/beta/genmen/index.hts. From this site, select TOWAIR Query to query this program. (This
erratum corrects the World Wide Web address which was incorrectly listed as index.html on the
previous release.)

Instructions and examples for using  TOWAIR Query and can be viewed by clicking on the Help button
after you have selected TOWAIR Query.

Technical questions may be directed to the Technical Support Group (202) 414-1250.  Other questions
may be directed to the FCC's National Call Center at 1-888-CALLFCC (1-888-225-5322) or to
FCCITD@fcc.gov.

                               -FCC-