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A11 controller chronicles operational error charged to him or her regarding a loss of wake turbulence separation after control was xferred to local controller.
| Attributes | |
| ACN | 657640 |
| Time | |
| Date | 200504 |
| Place | |
| Locale Reference | airport : anc.airport |
| State Reference | AK |
| Altitude | msl single value : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | common carrier : charter |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 16 |
| ASRS Report | 657640 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 29880 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I cleared a beech 1900 for a visual approach to runway 6L to follow a B737 that was landing on runway 6R. The B737 was cleared for a visual to runway 6R to follow a B747. Tower controller asked for communication and control of all aircraft; then allowed beech 1900 to pass aircraft #2. In trail wake turbulence separation was lost between aircraft #1; the B747; and aircraft #3; the beech. Beech had all preceding aircraft in sight; but tower controller failed to say magic words 'maintain visual separation' to beech. The operational error was charged to me; the approach controller; for political reasons.
Original NASA ASRS Text
Title: A11 CTLR CHRONICLES OPERROR CHARGED TO HIM OR HER REGARDING A LOSS OF WAKE TURB SEPARATION AFTER CTL WAS XFERRED TO LCL CTLR.
Narrative: I CLRED A BEECH 1900 FOR A VISUAL APCH TO RWY 6L TO FOLLOW A B737 THAT WAS LNDG ON RWY 6R. THE B737 WAS CLRED FOR A VISUAL TO RWY 6R TO FOLLOW A B747. TWR CTLR ASKED FOR COM AND CTL OF ALL ACFT; THEN ALLOWED BEECH 1900 TO PASS ACFT #2. IN TRAIL WAKE TURB SEPARATION WAS LOST BTWN ACFT #1; THE B747; AND ACFT #3; THE BEECH. BEECH HAD ALL PRECEDING ACFT IN SIGHT; BUT TWR CTLR FAILED TO SAY MAGIC WORDS 'MAINTAIN VISUAL SEPARATION' TO BEECH. THE OPERROR WAS CHARGED TO ME; THE APCH CTLR; FOR POLITICAL REASONS.
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.