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Less than standard separation occurred when ARTCC radar controller failed to take action to separate two aircraft on converging courses.
| Attributes | |
| ACN | 163624 |
| Time | |
| Date | 199011 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : eon |
| State Reference | IL |
| Altitude | msl bound lower : 16000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 2 |
| ASRS Report | 163624 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure |
Narrative:
Aircraft were given to center controller on uncoord parallel headings. Approach controller had given an airspeed to one aircraft which was in excess of normal climbing airspeed. Center controller issued the other aircraft a speed reduction. Neither approach or center controller coordination this with each other. Both aircraft were preceeding over a common departure fix, along with 5 other aircraft. Due to center to center intrail requirements (ZAU-ZID) controller (center) was attempting to achieve the desired spacing (via speed restrictions and radar vectors). The speed differences and radar vectors caused an overtake situation with a slight convergence of course (flight path). The conflict alert function of NAS reiterated the potential confliction. Center controller issued a vector and an expeditious climb. Action taken were insufficient to maintain minimum sep standards.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION OCCURRED WHEN ARTCC RADAR CTLR FAILED TO TAKE ACTION TO SEPARATE TWO ACFT ON CONVERGING COURSES.
Narrative: ACFT WERE GIVEN TO CTR CTLR ON UNCOORD PARALLEL HDGS. APCH CTLR HAD GIVEN AN AIRSPD TO ONE ACFT WHICH WAS IN EXCESS OF NORMAL CLBING AIRSPD. CTR CTLR ISSUED THE OTHER ACFT A SPD REDUCTION. NEITHER APCH OR CTR CTLR COORD THIS WITH EACH OTHER. BOTH ACFT WERE PRECEEDING OVER A COMMON DEP FIX, ALONG WITH 5 OTHER ACFT. DUE TO CTR TO CTR INTRAIL REQUIREMENTS (ZAU-ZID) CTLR (CTR) WAS ATTEMPTING TO ACHIEVE THE DESIRED SPACING (VIA SPD RESTRICTIONS AND RADAR VECTORS). THE SPD DIFFERENCES AND RADAR VECTORS CAUSED AN OVERTAKE SITUATION WITH A SLIGHT CONVERGENCE OF COURSE (FLT PATH). THE CONFLICT ALERT FUNCTION OF NAS REITERATED THE POTENTIAL CONFLICTION. CTR CTLR ISSUED A VECTOR AND AN EXPEDITIOUS CLB. ACTION TAKEN WERE INSUFFICIENT TO MAINTAIN MINIMUM SEP STANDARDS.
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.