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u <br /> 0:101' <br /> U.S Department <br /> of Transportation Airports District Office <br /> Federal Aviation <br /> 6301 34th Ave. So. , Rm. 111 I° <br /> Administration Minneapolis, Minnesota 55450 <br /> /'4 <br /> July 8, 1988 i <br /> i_f <br /> Mr. Alvin E. Whitaker <br /> 6422 York Heights Road g <br /> Waterloo, Wisconsin 53594 1 <br /> s <br /> s� <br /> Re: Airspace Case No. 88-AGL-1205-NRA N <br /> Schwarzwald Airport <br /> Waterloo, Wisconsin <br /> , <br /> Dear Mr. Whitaker: <br /> The Federal Aviation Administration has conducted an Aeronautical Study to I <br /> a <br /> determine the effect o of the the safe establishment of arzwald <br /> private-use airport, <br /> navigable airspace by aircraft. <br /> Based on that study, we have no objections. <br /> We recommend: <br /> 1. That you reference FAA Advisory Circular 150/5300-4B, "Utility <br /> Airports," in establishing an acceptable level of safety for Circular <br /> may <br /> aircraft operations this <br /> of airport.$5 50t f from the Super tend nt of <br /> be obtained at a cost <br /> Documents, SN 050-007-00630, U. S. Government Printing Office, <br /> Washington, D.C. 20402. <br /> 2. If there are obstructions in the runway approach surfaces which <br /> cannot be lowered or removed, the runway theres <br /> ho (s)(s) should minimum displaced and clearly marked so as to provide <br /> approach clearance over all obstruction it s safiwith <br /> landin sufficient <br /> remaining usable runway length to p <br /> departures by the aircraft using the runway. Enclosed is a <br /> The sketch <br /> sketch which illustrates a displaced threshold. <br /> a plane at h <br /> shows a displaced threshold at the point a <br /> rtical) <br /> slope of 20 to 1 (20 feet <br /> horizontal to 1 <br /> or clears theehighest <br /> intersects the runway and <br /> object in the approach area to the runway. Some obstructions <br /> are: <br /> a. Trees south of the runway• oles northeast of runway. <br /> b. Trees and telephone lines/poles <br /> The area 125 feet either side of the runway centerline be clear <br /> of all obstructions. <br /> Ow <br />