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Air carrier goes into coast status while being radar vectored to final approach resulting in less than standard separation.
| Attributes | |
| ACN | 208241 |
| Time | |
| Date | 199204 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 5500 msl bound upper : 5500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 208241 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : developmental |
| ASRS Report | 208171 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
Air carrier X, an medium large transport, inbound to ord was constantly going into coast status (transponder failure). At the time of the incident, I was involved in training a developmental. The trainee turned air carrier X onto his base leg (310 degrees). At this time, we lost both altitude and tracking on air carrier X. When the track reacquired, I immediately noticed a potential conflict between air carrier X and air carrier Y. I resolved this conflict via altitude restriction and turning air carrier X. I have noted chronic tracking problems with mlgs over the past several months at ord. Supplemental information from acn 208171: air carrier X was in the descent area his transponder was in coast status during most of his flight. The trainer recognized a possible situation and took control of the position. The trainer issued turns and dscnts to prevent a collision, which resulted in loss of separation, but no accident. The transponder capabilities of the (type aircraft) may have contributed to this error because of the inability to determine the exact position of air carrier X.
Original NASA ASRS Text
Title: ACR GOES INTO COAST STATUS WHILE BEING RADAR VECTORED TO FINAL APCH RESULTING IN LTSS.
Narrative: ACR X, AN MLG, INBOUND TO ORD WAS CONSTANTLY GOING INTO COAST STATUS (TRANSPONDER FAILURE). AT THE TIME OF THE INCIDENT, I WAS INVOLVED IN TRAINING A DEVELOPMENTAL. THE TRAINEE TURNED ACR X ONTO HIS BASE LEG (310 DEGS). AT THIS TIME, WE LOST BOTH ALT AND TRACKING ON ACR X. WHEN THE TRACK REACQUIRED, I IMMEDIATELY NOTICED A POTENTIAL CONFLICT BTWN ACR X AND ACR Y. I RESOLVED THIS CONFLICT VIA ALT RESTRICTION AND TURNING ACR X. I HAVE NOTED CHRONIC TRACKING PROBLEMS WITH MLGS OVER THE PAST SEVERAL MONTHS AT ORD. SUPPLEMENTAL INFO FROM ACN 208171: ACR X WAS IN THE DSCNT AREA HIS TRANSPONDER WAS IN COAST STATUS DURING MOST OF HIS FLT. THE TRAINER RECOGNIZED A POSSIBLE SITUATION AND TOOK CTL OF THE POS. THE TRAINER ISSUED TURNS AND DSCNTS TO PREVENT A COLLISION, WHICH RESULTED IN LOSS OF SEPARATION, BUT NO ACCIDENT. THE TRANSPONDER CAPABILITIES OF THE (TYPE ACFT) MAY HAVE CONTRIBUTED TO THIS ERROR BECAUSE OF THE INABILITY TO DETERMINE THE EXACT POS OF ACR X.
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.