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A11 controller described incident when new digital radar failed to display information on an aircraft on downwind at 8000 ft.
| Attributes | |
| ACN | 703610 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : anc.airport |
| State Reference | AK |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 21 controller time certified in position1 : 11 controller time certified in position2 : 3 |
| ASRS Report | 703610 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Navigational Facility FAA |
| Primary Problem | Navigational Facility |
Narrative:
Air carrier X was on a downwind vector and level 8000 ft when his ARTS data and primary/secondary radar data completely disappeared for the next 15 mi. 5 radar sectors were operating at the time of this incident; and ARTS data/primary secondary radar for air carrier X was not displayed on any of the 5 radar scopes. Traffic volume was on the heavier side of moderate and all the other aircraft in my sector (8 aircraft) displayed ARTS data and primary/secondary radar data. It was only air carrier X data that disappeared. Additionally; air carrier X reported in an area within 5 mi of 2 other aircraft -- a B747 a few mi south level at 9000 ft; and a B737 a few mi west at 10000 ft. A11 changed from analog to digital radar in jun/06.
Original NASA ASRS Text
Title: A11 CTLR DESCRIBED INCIDENT WHEN NEW DIGITAL RADAR FAILED TO DISPLAY INFO ON AN ACFT ON DOWNWIND AT 8000 FT.
Narrative: ACR X WAS ON A DOWNWIND VECTOR AND LEVEL 8000 FT WHEN HIS ARTS DATA AND PRIMARY/SECONDARY RADAR DATA COMPLETELY DISAPPEARED FOR THE NEXT 15 MI. 5 RADAR SECTORS WERE OPERATING AT THE TIME OF THIS INCIDENT; AND ARTS DATA/PRIMARY SECONDARY RADAR FOR ACR X WAS NOT DISPLAYED ON ANY OF THE 5 RADAR SCOPES. TFC VOLUME WAS ON THE HEAVIER SIDE OF MODERATE AND ALL THE OTHER ACFT IN MY SECTOR (8 ACFT) DISPLAYED ARTS DATA AND PRIMARY/SECONDARY RADAR DATA. IT WAS ONLY ACR X DATA THAT DISAPPEARED. ADDITIONALLY; ACR X RPTED IN AN AREA WITHIN 5 MI OF 2 OTHER ACFT -- A B747 A FEW MI S LEVEL AT 9000 FT; AND A B737 A FEW MI W AT 10000 FT. A11 CHANGED FROM ANALOG TO DIGITAL RADAR IN JUN/06.
Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.