ATC System Response to Events of September 11, 2001 Jonathan Histon & Prof. R. John Hansman JUP Meeting, October 10, 2001. Gander Newfoundland: Population.

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Presentation transcript:

ATC System Response to Events of September 11, 2001 Jonathan Histon & Prof. R. John Hansman JUP Meeting, October 10, Gander Newfoundland: Population September 10: ~ 10,000 Population September 11: ~ 16,000

Timeline of Events  September 11, 2001  8:45 a.m.  AAL 11 strikes North Tower  9:03 a.m.  UAL 175 strikes South Tower  9:17 a.m.  FAA closes all NY Airports  9:40 a.m. FAA closes all Airspace

NOTAM FDC 1/9731 FDC SPECIAL NOTICE - DUE TO EXTRADORDINARY CIRCUMSTANCES AND FOR REASONS OF SAFETY. ATTENTION ALL AIRCRAFT OPERATORS, BY ORDER OF THE FEDERAL AVATION COMMAND CENTER, ALL AIRPORTS/AIRDROMES ARE NOT AUTHORIZED FOR LANDING AND TAKEOFF. ALL TRAFFIC INCLUDING AIRBORNE AIRCRAFT ARE ENCOURAGE TO LAND SHORTLY.

10:00 a.m.  ____

System Shutdown Time

Departure Time Distribution “Official” FAA Shut Down of Airspace Departure Time

10:00 a.m :30 a.m.

Halifax

Timeline of Events (2)  Start-up  September 12  Diverted flights completed.  Repositioning flights allowed.  September 13  Airspace re-opened to commercial traffic (11:00 am)  September 14  General Aviation IFR Operations approved  Parcel deliveries resume (UPS, FedEx)  September 15  Airspace re-opened to foreign aircraft.  September 16  Mail, parcels, other cargo allowed on commercial flights.

System Start-up: Thursday, September 13, 2001

Gradual System Response Airspace Reopened

Summary  U.S. Airspace emptied in ~ 1 – 1.5 hours  Rate of 3300 aircraft / hour.  Aircraft airborne counts reached previous levels in 6 days  Large Jets still ~ 85% of all traffic.  Traffic counts are inconsistent with some other data sources  OPSNET, ASPM report operations down 17-18%  Further research opportunities  Ability to explore “undelayed” flight times.

Complexity Metrics Update  Project:  Develop understanding of cognitive complexity.  Recent development:  Capability to capture real traffic flows relative to sector shapes:  Example  Boston ARTCC, Utica Sector  Westbound flows from New England to Cleveland ARTCC  Controls FL180+  Sample Data  October 5, 2001  4 p.m  8 p.m.

Complexity Metrics Update Traffic flow through “Utica” Sector (Friday October, 5th 4 p.m.  8 p.m.)