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ZBW radar associate witnessed operational error at FL240 when radar controller issued conflicting altitude assignments.
| Attributes | |
| ACN | 645936 |
| Time | |
| Date | 200502 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : gdm.vortac |
| State Reference | MA |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar |
| Experience | controller non radar : 16 controller radar : 14 flight time total : 600 |
| ASRS Report | 645936 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Radar controller was working moderate traffic. Air carrier X was descended to FL240. Radar controller descended air carrier Y to FL240 and put FL250 in data block. Air carrier Y descended to FL245 when radar controller verified air carrier Y's altitude. Pilot said 'just leveling FL240.' controller then climbed air carrier Y to FL250 to regain separation.
Original NASA ASRS Text
Title: ZBW RADAR ASSOCIATE WITNESSED OPERROR AT FL240 WHEN RADAR CTLR ISSUED CONFLICTING ALT ASSIGNMENTS.
Narrative: RADAR CTLR WAS WORKING MODERATE TFC. ACR X WAS DSNDED TO FL240. RADAR CTLR DSNDED ACR Y TO FL240 AND PUT FL250 IN DATA BLOCK. ACR Y DSNDED TO FL245 WHEN RADAR CTLR VERIFIED ACR Y'S ALT. PLT SAID 'JUST LEVELING FL240.' CTLR THEN CLBED ACR Y TO FL250 TO REGAIN SEPARATION.
Data retrieved from NASA's ASRS site as of January 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.