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TRACON developmental controller descended an aircraft into another aircraft which resulted in less than standard separation.
| Attributes | |
| ACN | 146981 |
| Time | |
| Date | 199005 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 9000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : slc |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller non radar : 5 controller radar : 5 |
| ASRS Report | 146981 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : developmental |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 5200 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was training on the final position. The deviation approved 2 aircraft to enter the final airspace using vertical sep. 1 an small aircraft IFR at 9000', the other an small transport IFR at 10000'. Both were coming from the same direction at the same time. When the small transport checked on frequency the deviation told him to maintain 9000'. I, as the trner, didn't hear him issue the descent to 9000'. I observed the small transport at 9900', then at 9800'. I determined the small transport was descending and took action to turn the small transport away from the small aircraft. The small transport responded to the instructions and stated, 'we have the small aircraft in sight.' he was then told to maintain visibility sep and instructed to continue southbound and descended to 9000'. The small aircraft was then issued the traffic on the small transport and had him in sight. The deviation's phraseology was, 'flying heading 150, maintain 9000',' as opposed to, 'descend and maintain...' I never heard the deviation issue the clearance. The above was later discovered off the tape.
Original NASA ASRS Text
Title: TRACON DEVELOPMENTAL CTLR DESCENDED AN ACFT INTO ANOTHER ACFT WHICH RESULTED IN LESS THAN STANDARD SEPARATION.
Narrative: I WAS TRNING ON THE FINAL POS. THE DEV APPROVED 2 ACFT TO ENTER THE FINAL AIRSPACE USING VERT SEP. 1 AN SMA IFR AT 9000', THE OTHER AN SMT IFR AT 10000'. BOTH WERE COMING FROM THE SAME DIRECTION AT THE SAME TIME. WHEN THE SMT CHKED ON FREQ THE DEV TOLD HIM TO MAINTAIN 9000'. I, AS THE TRNER, DIDN'T HEAR HIM ISSUE THE DSNT TO 9000'. I OBSERVED THE SMT AT 9900', THEN AT 9800'. I DETERMINED THE SMT WAS DSNDING AND TOOK ACTION TO TURN THE SMT AWAY FROM THE SMA. THE SMT RESPONDED TO THE INSTRUCTIONS AND STATED, 'WE HAVE THE SMA IN SIGHT.' HE WAS THEN TOLD TO MAINTAIN VIS SEP AND INSTRUCTED TO CONTINUE SBND AND DSNDED TO 9000'. THE SMA WAS THEN ISSUED THE TFC ON THE SMT AND HAD HIM IN SIGHT. THE DEV'S PHRASEOLOGY WAS, 'FLYING HDG 150, MAINTAIN 9000',' AS OPPOSED TO, 'DSND AND MAINTAIN...' I NEVER HEARD THE DEV ISSUE THE CLRNC. THE ABOVE WAS LATER DISCOVERED OFF THE TAPE.
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.