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Risk Assessment Method to Support Modification of Airfield Separation Standards (2011) / Chapter Skim
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Pages 17-20

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 17...
... , and the third combines the deviation models from both studies and describes the models for risk of wingtip collision between two aircraft and between an aircraft and an object. The collision risk between two taxiing aircraft can be estimated using the mean wingtip distance between the two aircraft, in other words, the wingtip clearance when both aircraft are located on the taxiway centerlines.
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From page 18...
... based on the maximum wingspan for the specific ADG. Although the data used to develop the lateral deviation models were collected for the B-747 only, the same models were used to develop risk plots for aircraft belonging to other ADGs.
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From page 19...
... One simplifying assumption is necessary: the wingtip deviation distribution is the same as the aircraft lateral deviation distribution from the taxiway centerline. Using data from the FAA study, it is possible to estimate the probability of taxiway-object collision based on the mean wingtip separation; in other words, the separation when both aircraft are located at the respective taxiway centerlines (Scholz, 2003a)
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From page 20...
... Figures similar to Figure 14, based on separation between taxilane centerlines, were developed for each ADG based on the ratios presented in Table 6 and the maximum wingspan for the ADG. Taxilane/Object Separation Similar to the approach for taxilane/taxilane separations, adjustment factors were applied to the FAA/Boeing models for taxiway/object wingtip separations (Scholz, 2003a)
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Key Terms

  • risk plot
  • collision risk
  • object separation
  • wingtip separation
  • risk plots

  • wingtip sep
  • taxiway centerline
  • separation distance
  • separation analysis
  • location model

  • wingtip separations
  • location models
  • risk matrix
  • wingtip clearance
  • specific aircraft

  • parallel taxiway
  • specific adg
  • wingtip collisions
  • sion risk
  • lision risk

  • conservative assumption
  • matrix recommended
  • taxiway separation
  • taxilane incidents
  • extreme deviations

  • required separation
  • standard separation
  • taxiway centerlines
  • international airport
  • parallel taxiways


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