Air Traffic Airspace Branch, ASW-520 2005-AGL-6526-OE
2601 Meacham Blvd.
Fort Worth, TX 76137-0520
Forward Energy Center
One South Wacker Drive, Suite 2020
Chicago, IL 60606** NOTICE OF PRESUMED HAZARD **
The Federal Aviation Administration has conducted an aeronautical study under the provisions of 49 U.S.C., Section 44718 and if applicable Title 14 of the Code of Federal Regulations, part 77, concerning:
Structure Type: Wind Turbine
Location: BROWNSVILLE, WI
Latitude: 43-40-12.74 NAD 83
Heights: 389 feet above ground level (AGL)
1442 feet above mean sea level (AMSL)
Pending resolution of the issues described below, the structure is presumed to be a hazard to air navigation.
Further study has been initiated by the FAA.
See attachment for additional information.
NOTE: PENDING RESOLUTION OF THE ISSUE(S) DESCRIBED ABOVE, THE STRUCTURE IS PRESUMED TO BE A HAZARD TO AIR NAVIGATION. THIS LETTER DOES NOT AUTHORIZE CONSTRUCTION OF THE STRUCTURE EVEN AT A REDUCED HEIGHT. ANY RESOLUTION OF THE ISSUE(S) DESCRIBED ABOVE MUST BE COMMUNICATED TO THE FAA SO THAT A FAVORABLE DETERMINATION CAN SUBSEQUENTLY BE ISSUED.
If we can be of further assistance, please contact our office at (847)294-7458. On any future correspondence concerning this matter, please refer to Aeronautical Study Number 2005-AGL-6526-OE.
Signature Control No: 441481-446457 (NPH)
Section 77.23(a)(2) by 478 feet, a height that is 200 feet above ground Level or above the established airport elevation, whichever is higher, within 3 nautical miles of the established reference point of an airport, excluding heliports, with its longest runway more than 3,200 feet in actual length, and that height increases in proportion of 100 feet for each additional nautical mile of distance from the airport up to a maximum of 500 feet..
OTHER AERONAUTICAL EFFECTS:.
As shown in previous products, the proposed wind turbines are within radar line- of-sight of the Horicon radar. 84 RADES modeling and analysis tools have limited capability with respect to wind turbines. Therefore, the operational impact on the Air Force mission of the proposed wind farm development can't be fully assessed at this time. ..
Given the similarity between the two sites, we would expect the same degradation in performance at Horicon..
The Northeast Air Defense Sector (NEADS) is one of the primary users of the Horicon radar and has the responsibility of the Air Force's surveillance mission in the Horicon area. I have provided information concerning the proposed wind farm development near the Horicon radar to NEADS personnel. Until NEADS personnel have fully reviewed this information, they will not concur with the proposed wind farm development. .
Therefore, it is the best interest of the Air Force mission to delay the wind farm development until a comprehensive analysis can be completed.