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Interfacility communication problem ZME and ZID results in an operational error with ZID involving three aircraft.
| Attributes | |
| ACN | 527048 |
| Time | |
| Date | 200110 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : lvt.vortac |
| State Reference | TN |
| Altitude | msl bound lower : 36500 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc artcc : zab.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller military : 4 controller radar : 17 |
| ASRS Report | 527088 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : took evasive action flight crew : took precautionary avoidance action flight crew : returned to assigned altitude |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 23400 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Traffic situation evaluated on handoff between aircraft #1 and #2. Aircraft #1 safely behind #2. Aircraft #3 identified as traffic for aircraft #1. D side attempted to have previous sector/center (ZME) turn aircraft #3 left. There was some delay as aircraft switched to wrong frequency. I turned aircraft #1 20 degrees left for aircraft #3. I failed to re evaluate aircraft #2. Conflict alert activated between aircraft #1 and aircraft #2. I turned aircraft #1 southwest to a 200 degree heading. Advised aircraft #2 of traffic and turned right heading 120 degrees. Aircraft #2 stated 'we've got the traffic.' then #2 advised they were responding to a resolution advisory (RA). I asked which way he was maneuvering and was told they were instructed to descend 2000 ft. Aircraft #2 stopped his descent at 500 ft and was instructed to return to FL370. Aircraft #1 cleared back on course.
Original NASA ASRS Text
Title: INTERFAC COM PROB ZME AND ZID RESULTS IN AN OPERROR WITH ZID INVOLVING THREE ACFT.
Narrative: TFC SIT EVALUATED ON HDOF BETWEEN ACFT #1 AND #2. ACFT #1 SAFELY BEHIND #2. ACFT #3 IDENTIFIED AS TFC FOR ACFT #1. D SIDE ATTEMPTED TO HAVE PREVIOUS SECTOR/CENTER (ZME) TURN ACFT #3 LEFT. THERE WAS SOME DELAY AS ACFT SWITCHED TO WRONG FREQ. I TURNED ACFT #1 20 DEGS LEFT FOR ACFT #3. I FAILED TO RE EVALUATE ACFT #2. CONFLICT ALERT ACTIVATED BETWEEN ACFT #1 AND ACFT #2. I TURNED ACFT #1 SOUTHWEST TO A 200 DEG HEADING. ADVISED ACFT #2 OF TFC AND TURNED RIGHT HEADING 120 DEGS. ACFT #2 STATED 'WE'VE GOT THE TFC.' THEN #2 ADVISED THEY WERE RESPONDING TO A RESOLUTION ADVISORY (RA). I ASKED WHICH WAY HE WAS MANEUVERING AND WAS TOLD THEY WERE INSTRUCTED TO DESCEND 2000 FT. ACFT #2 STOPPED HIS DESCENT AT 500 FT AND WAS INSTRUCTED TO RETURN TO FL370. ACFT #1 CLRED BACK ON COURSE.
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.