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12/5/78 AC 150/5300-413 CHG 3 Appendix 9 APPENDIX 9. LOCATING RUNWAY APPROACH THRESHOLDS *1. PURPOSE. This appendix provides guidance for locating runway approach thresholds. 2. DISCUSSION. a. The runway approach threshold should be located at the beginning of the full strength runway pavement or runway surface. However, displacement of the runway approach threshold may be'required when an object that obstructs the airspace required for landing aircraft is beyond the airport -authority's power to remove, relocate, or lower. Runway approach thresholds may be displaced or relocated for environmental considerations, such as noise abatement. b. When an airport hazard exists, displacement of the runway approach threshold should be determined by the operational requirements of the critical aircraft and/or type of aircraft operation using or expected to be using the runway. The criteria depicted in this appendix are an effort to retain the existing operations on the runway and to minimize the loss of operational use of the established runway. These criteria are consistent with the FAA policy of maximum utilization and retention of existing paved areas on airports. c. Displacement of a runway approach threshold reduces the length of runway available for landing aircraft. The runway behind a displaced runway approach threshold is available for completing landing rollouts and takeoff in either direction. However, takeoff toward the control- ling object may be limited. Therefore, the clear zone requirements and airspace protection around the runway ends should be retained to the maximum extent possible. 3. APPLICATION. a. The inability to establish or maintain approaches clear of objects that could constitute an airport hazard may require displacing or relocating the runway approach threshold. The surfaces described in this appendix should be kept free of all penetrating objects. b. This appendix presents the minimum standards that should be met in determining the location of a runway approach threshold. (1) The runway approach threshold should be located to provide maximum operational usability of the existing or planned runway pavement. Par 1 Page 1