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A11 handoff controller described a near loss of required separation event when traffic was turned on final above and behind a B757 with less than the required distance but then issued a go-around to secure separation.
| Attributes | |
| ACN | 813605 |
| Time | |
| Date | 200811 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : a11.tracon |
| State Reference | AK |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : handoff position controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 1.5 controller time certified in position1 : 3 |
| ASRS Report | 813605 |
| Events | |
| Anomaly | non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Miss Distance | horizontal : 30000 vertical : 1100 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I was working the south handoff position while training was going on the south radar position. What I remembered happening was; a B757 was turned and told to intercept the localizer. A DH8 was told afterwards to turn and join the ILS 7R localizer as well. The B757 then was cleared for the approach. Then a B737 from the north was told to maintain 3000 ft and was turned west to avoid unsafe proximity with the DH8. I was watching this closely due to the fact the B737 was turned towards a 3500 ft MVA. While I was watching this; the trainee started to clear the DH8 for the approach; when I noticed that it looked too close and I put up the distant marker to show that it was indeed 4.8 when 5 was needed. The approach clearance was canceled all in the same transmission and the DH8 was broken out. I noticed as close of proximity as 4.8 and 1100 ft.
Original NASA ASRS Text
Title: A11 HANDOFF CONTROLLER DESCRIBED A NEAR LOSS OF REQUIRED SEPARATION EVENT WHEN TRAFFIC WAS TURNED ON FINAL ABOVE AND BEHIND A B757 WITH LESS THAN THE REQUIRED DISTANCE BUT THEN ISSUED A GO-AROUND TO SECURE SEPARATION.
Narrative: I WAS WORKING THE S HDOF POSITION WHILE TRAINING WAS GOING ON THE S RADAR POSITION. WHAT I REMEMBERED HAPPENING WAS; A B757 WAS TURNED AND TOLD TO INTERCEPT THE LOC. A DH8 WAS TOLD AFTERWARDS TO TURN AND JOIN THE ILS 7R LOC AS WELL. THE B757 THEN WAS CLRED FOR THE APCH. THEN A B737 FROM THE N WAS TOLD TO MAINTAIN 3000 FT AND WAS TURNED W TO AVOID UNSAFE PROX WITH THE DH8. I WAS WATCHING THIS CLOSELY DUE TO THE FACT THE B737 WAS TURNED TOWARDS A 3500 FT MVA. WHILE I WAS WATCHING THIS; THE TRAINEE STARTED TO CLR THE DH8 FOR THE APCH; WHEN I NOTICED THAT IT LOOKED TOO CLOSE AND I PUT UP THE DISTANT MARKER TO SHOW THAT IT WAS INDEED 4.8 WHEN 5 WAS NEEDED. THE APCH CLRNC WAS CANCELED ALL IN THE SAME XMISSION AND THE DH8 WAS BROKEN OUT. I NOTICED AS CLOSE OF PROX AS 4.8 AND 1100 FT.
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.