BASED ON THIS STUDY, WE HAVE NO OBJECTIONS PROVIDED THE POWERLINES, WHICH ARE OBSTRUCTIONS IN THE RUNWAY APPROACH SLOPE, ARE REMOVED/LOWERED OR THE RUNWAY THRESHOLD IS DISPLACED AND CLEARLY MARKED SO AS TO PROVIDED A MINIMUM OF 20:1 APPROACH CLEARANCE OVER THE OBSTRUCTIONS . WE RECOMMEND YOU REFERENCE FAA ADVISORY CIRCULAR 150/5300-48, "UTILITY AIRPORTS", IN ESTABLISHING AN ACCEPTABLE LEVEL OF SAFETY FOR AIRCRAFT OPERATIONS AT THIS AIRPORT (COPY ENCLOSED). WE POINT OUT THAT: 1. DUE TO EFFECTIVE RUNWAY LENGTH THAT IS AVAILABLE FOR TAKEOFF AND LANDING, CAUTION SHOULD BE GIVEN TO CALCULATION OF AIRCRAFT PERFORMANCE DATA AND SHOULD INCLUDE CORRECTIONS FOR TEMPERATURE AND ALTITUDE . 2. THE PROPOSED AIRPORT UNDERLIES FEDERAL AIRWAY V6 . THIS DETERMINATION SHOULD NOT BE CONSTRUED TO MEAN FAA APPROVAL OR DISAPPROVAL OF THE PHYSICAL DEVELOPMENT INVOLVED IN THE PROPOSAL . IT IS ONLY A DETERMINATION WITH RESPECT TO THE SAFE AND EFFICIENT USE OF AIRSPACE BY AIRCRAFT. IN MAKING THIS DETERMINATION, THE FAA HAS CONSIDERED MATTERS SUCH AS THE EFFECT THE PROPOSAL WOULD HAVE ON EXISTING OR PLANNED TRAFFIC PATTERNS OF NEIGHBORING AIRPORTS, THE EFFECTS IT WOULD HAVE ON THE EXISTING AIRSPACE STRUCTURE AND PROJECTED PROGRAMS OF THE FAA, AND THE EFFECTS THAT EXISTING OR PROPOSED MANMADE OBJECTS (ON FILE WITH THE FAA) AND KNOWN NATURAL OBJECTS WITHIN THE AFFECTED AREA WOULD HAVE ON THE AIRPORT PROPOSAL. THIS DETERMINATION IN NO WAY PREEMPTS OR WAIVES ANY ORDINANCE , LAWS, OR REGULATIONS OF...