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Air carrier Y had less than standard wake turbulence separation behind B757. Air carrier Y issued ma. System error.
| Attributes | |
| ACN | 297895 |
| Time | |
| Date | 199503 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | agl bound lower : 0 agl bound upper : 1500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl tower : atl |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 72 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach landing : missed approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 19 |
| ASRS Report | 297895 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure |
Narrative:
Air carrier X checked in approximately 16 mi out air carrier Y did the same 4.2 mi behind X. I checked this mileage view the computer. The mileage between the 2 was holding with comparable speeds. X slowed at the OM. When X touched down. The distance had closed a little. Still in my thoughts the distance between was sufficient. The tower supervisor called down and said it was getting close. Since X was on the ground, I elected to continue the approach with Y. At this time the tower supervisor called down and said break Y out. The local controller and I did it almost simultaneously.
Original NASA ASRS Text
Title: ACR Y HAD LESS THAN STANDARD WAKE TURB SEPARATION BEHIND B757. ACR Y ISSUED MA. SYS ERROR.
Narrative: ACR X CHKED IN APPROX 16 MI OUT ACR Y DID THE SAME 4.2 MI BEHIND X. I CHKED THIS MILEAGE VIEW THE COMPUTER. THE MILEAGE BTWN THE 2 WAS HOLDING WITH COMPARABLE SPDS. X SLOWED AT THE OM. WHEN X TOUCHED DOWN. THE DISTANCE HAD CLOSED A LITTLE. STILL IN MY THOUGHTS THE DISTANCE BTWN WAS SUFFICIENT. THE TWR SUPVR CALLED DOWN AND SAID IT WAS GETTING CLOSE. SINCE X WAS ON THE GND, I ELECTED TO CONTINUE THE APCH WITH Y. AT THIS TIME THE TWR SUPVR CALLED DOWN AND SAID BREAK Y OUT. THE LCL CTLR AND I DID IT ALMOST SIMULTANEOUSLY.
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.