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L30 controller has near loss of separation during vectors of two aircraft in trail for approach to las.
| Attributes | |
| ACN | 660308 |
| Time | |
| Date | 200506 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : las.vortac |
| State Reference | NV |
| Altitude | msl single value : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : approach |
| Route In Use | arrival star : unknown |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : approach |
| Route In Use | arrival star : unknown |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 660308 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Miss Distance | horizontal : 18000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I had a B737 following an A319 on the downwind. I issued A319 to descend to 7000 ft then reduce speed to 180 KTS. I then issued the same clearance to B737 who was about 4-5 mi in trail. A319 slowed before B757 and 4 mi became 3 mi. I then descended A319 to 6000 ft. There was a possibility there was less than 3 mi before I had 1000 ft established again. Also; the B737 reported A319 in sight.
Original NASA ASRS Text
Title: L30 CTLR HAS NEAR LOSS OF SEPARATION DURING VECTORS OF TWO ACFT IN TRAIL FOR APCH TO LAS.
Narrative: I HAD A B737 FOLLOWING AN A319 ON THE DOWNWIND. I ISSUED A319 TO DSND TO 7000 FT THEN REDUCE SPD TO 180 KTS. I THEN ISSUED THE SAME CLRNC TO B737 WHO WAS ABOUT 4-5 MI IN TRAIL. A319 SLOWED BEFORE B757 AND 4 MI BECAME 3 MI. I THEN DSNDED A319 TO 6000 FT. THERE WAS A POSSIBILITY THERE WAS LESS THAN 3 MI BEFORE I HAD 1000 FT ESTABLISHED AGAIN. ALSO; THE B737 RPTED A319 IN SIGHT.
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.