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Local controller allowed widebody transport Y to overtake widebody transport X resulting in less than standard separation.
| Attributes | |
| ACN | 236889 |
| Time | |
| Date | 199303 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mia |
| State Reference | FL |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mia |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| ASRS Report | 236889 |
| 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 : far non adherence : required legal separation other anomaly |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 10920 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
During a busy session on local control working combined position, lcn, lcs, ccn, and ccs, I cleared a widebody transport X for takeoff. Approximately 1 min later I cleared a widebody transport Y for takeoff. The widebody transport Y was overtaking the preceding aircraft by approximately 60 KTS and a loss of standard separation occurred 4 mi east of the airport. The slow speed of the widebody transport X was the cause of the loss of standard separation. I had anticipated the 4 mi radar separation when I cleared the second aircraft for takeoff.
Original NASA ASRS Text
Title: LCL CTLR ALLOWED WDB Y TO OVERTAKE WDB X RESULTING IN LTSS.
Narrative: DURING A BUSY SESSION ON LCL CTL WORKING COMBINED POS, LCN, LCS, CCN, AND CCS, I CLRED A WDB X FOR TKOF. APPROX 1 MIN LATER I CLRED A WDB Y FOR TKOF. THE WDB Y WAS OVERTAKING THE PRECEDING ACFT BY APPROX 60 KTS AND A LOSS OF STANDARD SEPARATION OCCURRED 4 MI E OF THE ARPT. THE SLOW SPD OF THE WDB X WAS THE CAUSE OF THE LOSS OF STANDARD SEPARATION. I HAD ANTICIPATED THE 4 MI RADAR SEPARATION WHEN I CLRED THE SECOND ACFT FOR TKOF.
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.