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ZBW controller experienced operational error at 110 during holding procedures when failing to note two aircraft at the same altitude; citing data block overlap as causal.
| Attributes | |
| ACN | 807631 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : helon |
| State Reference | NY |
| Altitude | msl single value : 110 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : holding |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 1 |
| ASRS Report | 807631 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 6000 |
| Supplementary | |
| Problem Areas | ATC Human Performance Navigational Facility |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I had 6 aircraft holding for ZZZ. When I started clearing the aircraft into new york approach; I cleared the DH8 (at 120) to 70 with the E145 (at 110) in the same holding pattern. I believe I missed the 110 ft traffic due to my data blocks overlapping. When conflict alert activated; they were in opposite directions.
Original NASA ASRS Text
Title: ZBW CTLR EXPERIENCED OPERROR AT 110 DURING HOLDING PROCS WHEN FAILING TO NOTE TWO ACFT AT THE SAME ALT; CITING DATA BLOCK OVERLAP AS CAUSAL.
Narrative: I HAD 6 ACFT HOLDING FOR ZZZ. WHEN I STARTED CLRING THE ACFT INTO NEW YORK APCH; I CLRED THE DH8 (AT 120) TO 70 WITH THE E145 (AT 110) IN THE SAME HOLDING PATTERN. I BELIEVE I MISSED THE 110 FT TFC DUE TO MY DATA BLOCKS OVERLAPPING. WHEN CONFLICT ALERT ACTIVATED; THEY WERE IN OPPOSITE DIRECTIONS.
Data retrieved from NASA's ASRS site as of May 2009 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.