Individually Owned: 151,845
Corporate Owned: 143,699
Aircraft Accident/Incident Report
Chicago, Illinois 60018
Thursday, March 23, 2006 9:07 CST
NTSB Narrative Summary Released at Completion of Accident
On March 23, 2006, at 0907 Central Standard Time, a runway incursion occurred between United Airlines (UAL) flight 604, a Boeing 737-300, and UAL1520, an A-320, at Chicago O'Hare International Airport (ORD) during daylight visual meteorological conditions. The north local controller cleared UAL604 for takeoff from runway 4L while UAL1520 was crossing the runway. The UAL604 co-pilot looked out the window and saw the A320 moving at a fast rate toward the runway, aborted the takeoff, and advised the controller that they were aborting their takeoff for the crossing traffic. The co-pilot stated that they did not get above taxi speed during their departure. Separation was lost with closest proximity of approximately 600 feet, the distance from approach end of runway 4L to taxiway H. AMASS did not activate.
NTSB Probable Cause Narrative
The probable cause of this incident was the ORD tower local controller's failure to provide sufficient separation between two aircraft departing intersecting runways. Contributing to the incident was the ORD local monitor's failure to monitor the situating and advise the local controller of the developing situation.
Event Information
| Type of Event | Incident |
| Event Date | 3/23/2006 |
| Event Day of the Week | Thursday |
| Time of Event | 907 |
| Event Time Zone | Central Standard Time |
| Event City | Chicago |
| Event State | ILLINOIS |
| Event Country | -- |
| Zipcode of the event site | 60018 |
| Event Date Year | 2006 |
| Event Date Month | 3 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | -- |
| Event Location Nearest Airport ID | -- |
| Indicates whether the acc/inc occurred off or on an airport | -- |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | KORD |
| Elevation of weather observation facility | -- |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | -- |
| Lighting Conditions | -- |
| Lowest Ceiling Height | 2600 |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | -- |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 4 |
| Dew Point at event time (in degress fahrenheit) | -3 |
| Wind Direction (degrees magnetic) | 70 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 4 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.25 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 121 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 22752 |
| NTSB Notification Source | FAA |
| NTSB Notification Date | Mar 23 2006 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Nov 30 2007 3:42PM |
| User who most recently changed record | NTSB\lema |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
||
|---|---|---|
Aircraft #1 |
Aircraft #2 |
|
| Aircraft Registration Number | -- | -- |
| NTSB Number | OPS06IA007A | OPS06IA007B |
| Missing Aircraft Indicator | -- | -- |
| Federal Aviation Reg. Part | -- | -- |
| Type of Flight Plan filed | IFR | IFR |
| Flight plan Was Activated? | Yes | Yes |
| Damage | None | None |
| Aircraft Fire | None | None |
| Aircraft Explosion | None | None |
| Aircraft Manufacturer's Full Name | Boeing | Airbus Industrie |
| Aircraft Model | 737-300 | 320-200 |
| Aircraft Series Identifier | -- | -- |
| Aircraft Serial Number | -- | -- |
| Certified Max Gross Weight | -- | -- |
| Aircraft Category | Airplane | Airplane |
| Aircraft Registration Class | -- | -- |
| Aircraft is a homebuilt? | No | No |
| Flight Crew Seats | -- | -- |
| Cabin Crew Seats | -- | -- |
| Passenger Seats | -- | -- |
| Total number of seats on the aircraft | -- | -- |
| Number of Engines | -- | -- |
| Fixed gear or retractable gear | Fixed | Fixed |
| Aircraft, Type of Last Inspection | -- | -- |
| Date of Last Inspection | -- | -- |
| Airframe hours since last inspection | -- | -- |
| Airframe Hours | -- | -- |
| ELT Installed | -- | -- |
| ELT Activated | -- | -- |
| ELT Aided Location of Event Site | -- | -- |
| ELT Type | -- | -- |
| Aircraft Owner Name | -- | -- |
| Aircraft Owner Street Address | -- | -- |
| Aircraft Owner City | -- | -- |
| Aircraft Owner State | -- | -- |
| Aircraft Owner Country | -- | -- |
| Aircraft Owner Zipcode | -- | -- |
| Operator is an individual? | -- | -- |
| Operator Name | -- | -- |
| Operator Same as Owner? | -- | -- |
| Operator Is Doing Business As | -- | -- |
| Operator Address Same as Owner? | -- | -- |
| Operator Street Address | P.O. Box 66100 | P.O. Box 66100 |
| Operator City | Chicago | Chicago |
| Operator State | IL | IL |
| Operator Country | USA | USA |
| Operator Zip code | 60666 | 60666 |
| Operator Code | UALA | UALA |
| Owner has at least one certificate | -- | -- |
| Other Operator of large aircraft? | -- | -- |
| Certified for Part 133 or 137 Operation | -- | -- |
| Operator Certificate Number | -- | -- |
| Indicates whether an air carrier operation was scheduled or not | Scheduled | Scheduled |
| Indicates Domestic or International Flight | Domestic | Domestic |
| Operator carrying Pax/Cargo/Mail | Passenger Only | Passenger Only |
| Type of Flying (Per_Bus / Primary) | -- | -- |
| Second Pilot on Board | -- | -- |
| Departure Point Same as Event | Yes | Yes |
| Departure Airport Code | KORD | KORD |
| Departure City | Chicago | Chicago |
| Departure State | IL | IL |
| Departure Country | USA | USA |
| Departure Time | -- | -- |
| Departure Time Zone | CST | CST |
| Destination Same as Local Flt | -- | -- |
| Destination Airport Code | KDCA | KMCO |
| Destination City | Washington | Orlando |
| Destination State | DC | FL |
| Destination Country | USA | USA |
| Specific Phase of Flight | Takeoff - aborted | Taxi - to takeoff |
| Report sent to ICAO? | -- | -- |
| Evacuation occurred | -- | -- |
| Date of most recent change to record | Nov 19 2007 6:59PM | Nov 19 2007 6:59PM |
| User who most recently changed record | ROWS | ROWS |
| Since inspection or accident | -- | -- |
| Event Location Runway Number and Location | -- | -- |
| Runway Length | -- | -- |
| Runway Width | -- | -- |
| Sight Seeing flight | No | No |
| Air Medical Flight | No | No |
| Medical Flight | -- | -- |