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ZOB controller described a loss of separation event claiming the ait/flash thru procedure currently utilized needs to be revised to prevent future similar type events.
| Attributes | |
| ACN | 943579 |
| Time | |
| Date | 201104 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZOB.ARTCC |
| State Reference | OH |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft X was handed off from jxn sector to det sector. Det sector approved climbing to FL260 using the 'interim altitude/flash thru' procedure. Jxn sector climbed aircraft X to FL260 and as required by in house ait procedures to keep the aircraft on jxn frequency while waiting for ZAU pmm sector to accept the hand-off. Conflict alert activated with aircraft Y at FL270. Targets appeared to have merged. Jxn sector was unaware and unable to advise aircraft X of merging target/traffic as jxn altitude filter limits restrict jxn from 'seeing' limited data blocks 3000 ft above sector vertical limits. When conflict alert activated; the incident was already past. Merging target procedures; as required by the 7110.65; was not followed due to ait/flash-thru procedure. Recommendation; an amendment to ait/flash-thru should read 'if the aircraft is leaving the vertical limits of controller a airspace and controller C has not accepted the hand-off; controller a shall transfer communications to controller B.' this will insure merging target procedures by requiring the controller/sector in communications with the aircraft is monitoring all traffic within the vertical limits of the aircraft.
Original NASA ASRS Text
Title: ZOB Controller described a loss of separation event claiming the AIT/FLASH THRU procedure currently utilized needs to be revised to prevent future similar type events.
Narrative: Aircraft X was handed off from JXN Sector to DET Sector. DET Sector approved climbing to FL260 using the 'Interim Altitude/FLASH THRU' procedure. JXN Sector climbed Aircraft X to FL260 and as required by in house AIT procedures to keep the aircraft on JXN frequency while waiting for ZAU PMM Sector to accept the hand-off. Conflict Alert activated with Aircraft Y at FL270. Targets appeared to have merged. JXN Sector was unaware and unable to advise Aircraft X of merging target/traffic as JXN altitude filter limits restrict JXN from 'seeing' Limited Data Blocks 3000 FT above sector vertical limits. When Conflict Alert activated; the incident was already past. Merging target procedures; as required by the 7110.65; was not followed due to AIT/FLASH-THRU procedure. Recommendation; an amendment to AIT/FLASH-THRU should read 'if the aircraft is leaving the vertical limits of controller A airspace and Controller C has not accepted the hand-off; Controller A shall transfer communications to controller B.' This will insure merging target procedures by requiring the controller/sector in communications with the aircraft is monitoring all traffic within the vertical limits of the aircraft.
Data retrieved from NASA's ASRS site as of April 2012 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.