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38 Airports and the Newest Generation of General Aviation Aircraft Table 5-4. Taxiway standards for new generation GA aircraft. ARC B-I ARC B-II ARC B-I ARC B-II small aircraft small aircraft small aircraft small aircraft Visibility Not lower than mile Lower than mile Minimum Width 25' 35' 25' 35' Runway to Taxiway 150' 240' 200' 300' Separation Taxiway Safety 49' 79' 49' 79' Area Taxiway Object 89' 131' 89' 131' Free Area Taxiway Object 79' 115' 79' 115' Free Area Source: FAA AC 150/5300-13, Tables 2-1 and 4.1. for Airports guidance document, wildlife hazards cause more than 500,000 hours of aircraft downtime and cost Key Wildlife Hazard Questions U.S. civil aviation in excess of $500 million every year. Are there existing wildlife issues at the The USDA can help airports in assessing wildlife haz- airport? ards and identifying mitigation steps. The levels of man- What steps has the airport taken to agement range from prescribed grass mowing heights to minimize these issues? fencing to active discouragement. The USDA offers con- Are there wildlife attractants on or near sultation and management assistance to assess wildlife the airport area? conflicts at airports and improve safety by reducing haz- Is a wildlife hazard assessment appropriate? ards associated with wildlife. The FAA also provides guidance in FAA AC 150/5200-33B, Hazardous Wildlife Attractant on or Near Airports, to help an airport identify potential wildlife concerns. Wildlife hazard assessment and management plans are addressed on a case-by-case basis. If it is a concern at a specific airport, a good place to start is by contacting the local USDA office to enlist assistance. 5.3 Instrument Approach Key Instrument Approach Questions One of the characteristics of new generation air- How often do poor weather conditions craft is the use of glass cockpits and other modern (i.e., less than 1,000 ft ceiling and 3 miles navigational equipment. Aside from an appropriate visibility) occur? runway, having an instrument approach to provide How are the aircraft using the airport all-weather access is probably the next most valuable equipped? asset for an airport seeking to attract new generation If the airport has ground-based approaches, aircraft activity. are sufficient parts and components readily One of the critical factors in providing all-weather available to maintain the equipment? access is the availability of instrument approaches to What survey information is available or the airport with minimums as low as the airport and needed to identify terrain and obstacles surrounding objects can allow. The airport's ability to located near the airport? accommodate instrument approaches is tied to the Can the approach minimums be improved? clear areas off the sides and ends of the runway and What is involved? What is the cost? the terrain and obstacles near the airport. Instrument approaches are established to a specific runway end.