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ATCT local controller released a faster gulf too close behind the preceding DA20 and without any speed restr on the gulf. Local controller was applying visual separation. The departure controller had to stop the gulf at a lower altitude and also apply visual separation to prevent less than standard separation from occurring.
| Attributes | |
| ACN | 391251 |
| Time | |
| Date | 199801 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 7000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phx tower : phx |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 20G/20GF/ Mysterre Falcon 200 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream III |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar pilot : instrument |
| Experience | controller non radar : 12 controller radar : 3 flight time total : 2200 |
| ASRS Report | 391251 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Tower cleared gulf behind DA20, routing on sids is same for 20 mi after takeoff, both aircraft assigned 8000 ft, no speed restr. Departure controller distracted -- gulf would not 'tag up,' computer would not accept an 'ARTS force' and flight plan showed time in computer had expired. Second aircraft was rapidly overtaking preceding aircraft and climbing into same altitude. Departure controller stopped gulf at 7000 ft and established visual separation. This facility had a similar operational error 1 week ago. The departure controller needs to know when tower is applying visual separation, and tower controllers need training on how to apply visual separation. Overtakes are not uncommon. I believe that the new 'ICAO identifiers' contributed to the lack of separation since the valuable performance information (ie, G2, G5, etc) was stripped off the aircraft type. A ucr was previously filed on this problem. FAA headquarters determined that it was not a problem.
Original NASA ASRS Text
Title: ATCT LCL CTLR RELEASED A FASTER GULF TOO CLOSE BEHIND THE PRECEDING DA20 AND WITHOUT ANY SPD RESTR ON THE GULF. LCL CTLR WAS APPLYING VISUAL SEPARATION. THE DEP CTLR HAD TO STOP THE GULF AT A LOWER ALT AND ALSO APPLY VISUAL SEPARATION TO PREVENT LTSS FROM OCCURRING.
Narrative: TWR CLRED GULF BEHIND DA20, ROUTING ON SIDS IS SAME FOR 20 MI AFTER TKOF, BOTH ACFT ASSIGNED 8000 FT, NO SPD RESTR. DEP CTLR DISTRACTED -- GULF WOULD NOT 'TAG UP,' COMPUTER WOULD NOT ACCEPT AN 'ARTS FORCE' AND FLT PLAN SHOWED TIME IN COMPUTER HAD EXPIRED. SECOND ACFT WAS RAPIDLY OVERTAKING PRECEDING ACFT AND CLBING INTO SAME ALT. DEP CTLR STOPPED GULF AT 7000 FT AND ESTABLISHED VISUAL SEPARATION. THIS FACILITY HAD A SIMILAR OPERROR 1 WK AGO. THE DEP CTLR NEEDS TO KNOW WHEN TWR IS APPLYING VISUAL SEPARATION, AND TWR CTLRS NEED TRAINING ON HOW TO APPLY VISUAL SEPARATION. OVERTAKES ARE NOT UNCOMMON. I BELIEVE THAT THE NEW 'ICAO IDENTIFIERS' CONTRIBUTED TO THE LACK OF SEPARATION SINCE THE VALUABLE PERFORMANCE INFO (IE, G2, G5, ETC) WAS STRIPPED OFF THE ACFT TYPE. A UCR WAS PREVIOUSLY FILED ON THIS PROB. FAA HEADQUARTERS DETERMINED THAT IT WAS NOT A PROB.
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.