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ATCSCC

ATCSCC. Data Quality Presentation ATCSCC Quality Assurance April 18, 2001. Data Quality Concerns. Overview. Recurring data quality issues in GDPs Current algorithm issues that can impact GDPs ETMS arrival data issues that can impact GDPs. Recurring Data Issues. Pop Ups

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ATCSCC

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  1. ATCSCC Data Quality Presentation ATCSCC Quality Assurance April 18, 2001 Data Quality Concerns

  2. Overview • Recurring data quality issues in GDPs • Current algorithm issues that can impact GDPs • ETMS arrival data issues that can impact GDPs

  3. Recurring Data Issues • Pop Ups • Time Out Delays/Cancels • Compliance • ETE variations

  4. EWR Pop Ups 4/11

  5. EWR Pop Ups 4/11

  6. LGA Pop Ups 4/12

  7. LGA Pop Ups 4/12

  8. EWR Time Out Delays 4/11

  9. LGA Time Out Delays 4/12

  10. LGA Time Out Cancels 4/12

  11. EWR Departure Compliance 4/11

  12. LGA Departure Compliance 4/12

  13. EWR ETE Variations 4/11

  14. LGA ETE Variations 4/12

  15. LGA ETE Variations with Substitution 4/12 • 31 flights ETE changed with substitution • 24 flights increased ETE by 25% or more

  16. Algorithm Issues • Slots created for flights with ETA prior to GDP start time • GDP revisions hold slot assignment for flights that arrived earlier than CTA

  17. Slots created for flights with ETA prior to GDP start time • Flights are included in GDP using three fields. • ETA • IGTA – taxi (10 minutes) • BETA If any one of these fields falls in GDP time frame, flight will receive a CTA even if flight is estimated to arrive prior to GDP start time.

  18. BOS Before GDP 4/8 1700z

  19. BOS GDP 4/8 Reflect ADL 1700z

  20. ORD Before GDP 4/6 1700z

  21. ORD GDP 4/6 Reflect ADL 1700z

  22. LGA Before GDP 4/8 1900z

  23. LGA GDP 4/8 Reflect ADL 1900z

  24. GDP revisions hold slots for flights that arrived early • Flight arrives prior to CTA • CTA time is after revision ADL time (CTA is in future) • When revision is run, slots are held for flights that have arrived prior to CTA

  25. LGA GDP 3/26 Before Revision • LGA at 1617z viewed by ETA. • 18 flights with ARTA prior to current ADL (1617z) with CTA after 1617z

  26. LGA GDP 3/26 Before Revision • LGA at 1617z viewed by CTA. • Same 18 flights shown by CTA, all after 1617z

  27. LGA GDP 3/26 After Revision • LGA modeled revision at 1617z viewed by ETA. • Same 18 flights shown with ETA prior to current ADL time 1617z

  28. LGA GDP 3/26 After Revision • LGA modeled revision at 1617z viewed by CTA. • Same 18 flights hold slots in future. • Demand by CTA=45 • Demand by ETA=28

  29. Compliance

  30. ETE Variations

  31. ETMS Arrival Data • AZ messages equate to ARTA • AZ messages do not always match actual arrival times. • Normally not off by much • Known problem • May be significant impact to GDPs with holding

  32. PHL ATCT Actual Arrival Time VS. AZ time

  33. PHL GDP on 3/21 • Holding reached +30 at 1804 • First revision ran at 1835z • Holding reached +45 at 1912 • Arrival delays were +45 to +60 for over three hours • International Diverts • Additional Revisions run at 2110z and 2141z

  34. Back Up Slides

  35. ORD GDP 4/6 Before Revision • ORD at 2153z viewed by ETA. • 9 flights with ETA prior to current ADL (2153z) have CTA after 2153z

  36. ORD GDP 4/6 Before Revision • ORD at 2153z viewed by CTA • Same 9 flights shown by CTA, all after 2153z

  37. ORD GDP 4/6 After Revision • ORD at 2203z viewed by ETA • Same 9 flights with ETA prior to 2153z.

  38. ORD GDP 4/6 After Revision • ORD at 2203z viewed by CTA • Of the 9 flights, 5 hold slots in future, the other 4 have slots 2153-2203

  39. LGA Proposed Revision by ETA

  40. LGA Proposed Revision by CTA

  41. April 8 - LGA Pop Ups by Hour

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