1. Airport Noise Compatibility Study Group Navigation Committee Noise Abatement Strategies: The Critical Questions  Which runway use provides the most noise reduction north of the airport?  east preference (current)  west preference  no preference  day/night split  Which runway use provides the most noise reduction south of the airport?  mixed divergence off west runway (current)  all diverge  no divergence (except simultaneous ops)  resolve Fort Knox restricted area issue  How can we minimize exceptions to contraflow operations, thus minimize sleep disturbance?  options  operations affected/cost  benefits  How can we improve the consistency and predictability of runway use direction?  education/knowledge base  too hard for model

2. Airport Noise Compatibility Study Group Navigation Committee Noise Abatement Strategies: The Critical Questions  Which turning rules give the “best” results?  noise exposure  consistency/predictability  alone/with standard prescribed tracks  What prescribed tracks give the best noise reduction, while remaining operationally sound?  for arrivals  for departures  with/without exceptions for visual  handoff/gateway points  What navigation aids or standards can be applied to minimize deviation from prescribed tracks?  required navigational performance (RNP)  specific hardware/procedures  for emerging technology, knowledge base  What other operational procedures can be added to reduce noise exposure?  costs  benefits  What other facilities, use restrictions, regulations, and management measures can be applied to enhance the program?

3. Airport Noise Compatibility Study Group Navigation Committee Noise Abatement Strategies: Bear Traps  Imprecision  “daytime contraflow”  “I-65 corridor”  “straight-out departure track”  Premature Closure  advanced technology  contraflow exceptions  runway use criteria  net assessment  Terminology  “preference/preferential use”  “peak/non-peak”  “voluntary measure”  Meaningful progress depends on our ability to avoid these traps. If we don’t, we get stuck.

4. Airport Noise Compatibility Study Group Navigation Committee Noise Abatement Strategies: Imperatives  Precise definition of each strategy  measures included  measures excluded  rationale  follow-up documentation  Close - intimate - communication on analysis  Study Group checks inputs  emerging insights relayed right away  anomalies identified for further study  course corrections when appropriate  Open-ended review of results  think before packaging  challenge assumptions, conclusions  ongoing feedback  Results of this phase crucial to study results. “Oops” no longer affordable.

5. Airport Noise Compatibility Study Group Navigation Committee Noise Abatement Strategies recommended to the Study Group  Common elements  minimize contraflow exceptions  noise-optimal prescribed tracks (STARs, SIDs) with minimal exceptions  RNP or hardware specs to minimize deviation  operational measures (potential excursions)  facilities, use restrictions, regulations, management measures  document knowledge of ‘emerging’ measures  Principal alternatives  Limit east runway preference to daytime only; southbound divergence according to destination  Eliminate runway preference; all southbound diverge on 17R  Reverse runway preference; no divergence on 17R, except simultaneous operations  Key conditions:  Ft Knox issue resolved favorably  Results for each major lobe of noise contours