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Zan controller could not, in a timely manner, establish legal separation between a climbing and descending air carrier.
| Attributes | |
| ACN | 444041 |
| Time | |
| Date | 199907 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : joh.vortac |
| State Reference | AK |
| Altitude | msl single value : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zan.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j501.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zan.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : private |
| Experience | controller non radar : 7 controller radar : 6 flight time total : 100 |
| ASRS Report | 444041 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 19990 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Facility ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The operational error described here involved 2 aircraft X (TB73QA) was departing anc en route to sju (eastbound), climbing to FL330. Aircraft Y (HB744I) was arriving anc from jfk (swbound, descending from FL390 to 16000 ft. These aircraft lost separation at approximately FL230, with the closest proximity of 3.29 NM lateral and 300 ft vertical. The controller detected the impending error prior to loss of separation and attempted to apply vertical separation. Conflict alert was not activated. Although the final cause of the operational error is classified as human error, contributing factors may include missed opportunities related to a new sector implementation.
Original NASA ASRS Text
Title: ZAN CTLR COULD NOT, IN A TIMELY MANNER, ESTABLISH LEGAL SEPARATION BTWN A CLBING AND DSNDING ACR.
Narrative: THE OPERROR DESCRIBED HERE INVOLVED 2 ACFT X (TB73QA) WAS DEPARTING ANC ENRTE TO SJU (EBOUND), CLBING TO FL330. ACFT Y (HB744I) WAS ARRIVING ANC FROM JFK (SWBOUND, DSNDING FROM FL390 TO 16000 FT. THESE ACFT LOST SEPARATION AT APPROX FL230, WITH THE CLOSEST PROX OF 3.29 NM LATERAL AND 300 FT VERT. THE CTLR DETECTED THE IMPENDING ERROR PRIOR TO LOSS OF SEPARATION AND ATTEMPTED TO APPLY VERT SEPARATION. CONFLICT ALERT WAS NOT ACTIVATED. ALTHOUGH THE FINAL CAUSE OF THE OPERROR IS CLASSIFIED AS HUMAN ERROR, CONTRIBUTING FACTORS MAY INCLUDE MISSED OPPORTUNITIES RELATED TO A NEW SECTOR IMPLEMENTATION.
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.