 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ZAU controller had a data block overlap situation causing a loss of separation between 2 aircraft at FL330.
| Attributes | |
| ACN | 478407 |
| Time | |
| Date | 200007 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dbq.airport |
| State Reference | IA |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : position and hold |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Cessna Citation Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : private |
| Experience | controller radar : 19 flight time total : 350 |
| ASRS Report | 478407 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Miss Distance | horizontal : 24000 vertical : 1200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X checked on frequency at FL350 direct caspr intersection. Aircraft reclred over alo, ia, for sequencing behind another air carrier at FL350. Aircraft Y (a citation) turned direct gna, tn. At FL330 for WX at mzv, il, air carrier X said he was getting chop and would like a lower altitude. In time approximately 1 min or less, air carrier X was issued a lower altitude. The proximity of aircraft Y was overlapped with other data blocks. When situation observed, air carrier X was turned left to a heading of 260 degrees to try to maintain separation.
Original NASA ASRS Text
Title: ZAU CTLR HAD A DATA BLOCK OVERLAP SIT CAUSING A LOSS OF SEPARATION BTWN 2 ACFT AT FL330.
Narrative: ACR X CHKED ON FREQ AT FL350 DIRECT CASPR INTXN. ACFT RECLRED OVER ALO, IA, FOR SEQUENCING BEHIND ANOTHER ACR AT FL350. ACFT Y (A CITATION) TURNED DIRECT GNA, TN. AT FL330 FOR WX AT MZV, IL, ACR X SAID HE WAS GETTING CHOP AND WOULD LIKE A LOWER ALT. IN TIME APPROX 1 MIN OR LESS, ACR X WAS ISSUED A LOWER ALT. THE PROX OF ACFT Y WAS OVERLAPPED WITH OTHER DATA BLOCKS. WHEN SIT OBSERVED, ACR X WAS TURNED L TO A HDG OF 260 DEGS TO TRY TO MAINTAIN SEPARATION.
Data retrieved from NASA's ASRS site as of July 2007 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.