NOLF CHOCTAW JLUS - Santa Rosa County, Florida, Economic ...

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September 2003CHAPTER 3: NOLF CHOCTAWThe Clear Zone is an area that possesses a high potential for accidents and is located just past theend of a runway. It has been labeled “A” to enable easier depiction on maps.B. Accident Potential Zones. (CLASS B) Beyond the Clear Zone is an area along the flight paththat possesses a significant potential for accidents. Created as part of the AICUZ program,Accident Potential Zones (APZ) are intended to delineate areas exposed to higher risk. Intendedto serve as guidelines only, APZs function to heighten the general public’s awareness to areaswhere higher risks occur. They also help local governments to identify where to direct zoningregulations and land use standards designed to reduce potential conflicts between airfieldoperations and civilian populations.Accident Potential Zones (APZ's) are divided into two (2) designations based on accident potential.The zone closest to the Clear Zone is referred to as APZ-I. It has been labeled “B”. APZ-II(labeled “C”) is typically furthest from the runway in terms of the flight path and it has ameasurable potential for accidents. Approach or departure flight paths will turn into or away froma runway. Therefore, APZ’s I and II may curve away from the end of a runway as well has leadingstraight out. Based on designated airport flight paths for approach and departure, some areas in aAPZ-II zone may actually be closer to a runway than portion of the APZ-I. Figure 3-1 inAppendix 3B provides a diagram further describing the organization and application of APZs forhelicopters and fixed-wing aircraft.NOLF Choctaw operates as a multi-use airfield capable of serving fixed-wing (i.e., airplanes) androtary-wing (i.e., helicopter) aircraft. Fixed-wing aircraft must use runways for landing and takeoff.Both Fixed wing and rotary wing aircraft typically arrive or depart an airfield facing into thewind. The APZ designations (Class B airfield) for NOLF Choctaw are larger than those associatedwith NAS Whiting Field and NOLF Holley which are considered Class A airfields. Helicoptertraffic is a small percentage of the total traffic and helicopter APZ’s are not designated for thisNOLF. Flight paths for helicopters taking-off or landing will vary based on wind direction and airtraffic. Operating procedures established by NAS Whiting Field direct helicopters to arrive orleave the field on a north or south pattern under normal weather or air traffic conditions. Based onwind direction or air traffic, the helicopter flight paths may not always overlap with the designatedAPZ.C. Noise Level Zone. In addition to addressing safety concerns, the AICUZ also addresses noiseexposure to non-military lands near military installations. Noise exposure can create conflicts withpublic welfare and quality of life for those living or working near airfields. For the NOLFChoctaw JLUS, noise level contours extending from the airfield are incrementally measured fromthe highest typical decibel (dB) generated within a military installation to 55 dB within nonmilitaryproperty. Within the Choctaw Study Area, non-military lands inside the 55 dB contourare referred to as the Noise Zone.Similar to aircraft operational conditions described above for APZs, helicopters must faceoncoming wind to create optimal conditions for safe take-off and landing. Subject to aerodynamicwind effects, landing and take-off flight paths for helicopters experience wider variations thanflight paths for fixed-wing aircraft, which must be aligned with a runway. Helicopter approach andSanta Rosa Joint Land Use StudySanta Rosa County and NAS Whiting Field3-4
September 2003CHAPTER 3: NOLF CHOCTAWdeparture to and from an airfield follow pre-determined flight paths referred to as the “normalflight path.” Deviation from a normal helicopter flight path occurs to take advantage of safer flightpaths created by wind direction or to accommodate air traffic. Noise patterns for helicopters canvary for the dynamic conditions stated. A Noise Zone for helicopters must allow for moreflexibility than that for fixed-wing aircraft because of aerodynamic and safety requirements.Santa Rosa Joint Land Use StudySanta Rosa County and NAS Whiting Field3-5
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