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Small aircraft X instructed to maintain visual separation from small transport Y lost sight of small transport Y on approach had less than standard separation.
| Attributes | |
| ACN | 211385 |
| Time | |
| Date | 199205 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : tul |
| State Reference | OK |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : tul |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | descent : approach |
| Flight Plan | None |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent : approach |
| Flight Plan | None |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 211385 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
I was opening the final west sector at tul ATC tower. The level of complexity was at a difficult level and increasing. The workload was moderate to heavy even though the WX was VFR. There were numerous aircraft inbound for runway 36R, of which several were requesting practice ILS approachs. Small aircraft X was issued traffic and advised me that he had the traffic in sight. I instructed small aircraft X to maintain visual separation from the traffic, which was a twin engine small transport Y who was VFR and requesting a VFR practice approach. I asked small aircraft X if he still had small transport Y in sight. Small aircraft X advised me that he had lost sight of the traffic. Small transport Y was a faster airplane than small aircraft X and appeared to be almost 3 mi ahead small aircraft X. I feel that this situation could have been avoided by opening the final west sector before the level of complexity got to such of a difficult level by having a moderate to heavy workload when the sector was opened.
Original NASA ASRS Text
Title: SMA X INSTRUCTED TO MAINTAIN VISUAL SEPARATION FROM SMT Y LOST SIGHT OF SMT Y ON APCH HAD LTSS.
Narrative: I WAS OPENING THE FINAL W SECTOR AT TUL ATC TWR. THE LEVEL OF COMPLEXITY WAS AT A DIFFICULT LEVEL AND INCREASING. THE WORKLOAD WAS MODERATE TO HVY EVEN THOUGH THE WX WAS VFR. THERE WERE NUMEROUS ACFT INBOUND FOR RWY 36R, OF WHICH SEVERAL WERE REQUESTING PRACTICE ILS APCHS. SMA X WAS ISSUED TFC AND ADVISED ME THAT HE HAD THE TFC IN SIGHT. I INSTRUCTED SMA X TO MAINTAIN VISUAL SEPARATION FROM THE TFC, WHICH WAS A TWIN ENG SMT Y WHO WAS VFR AND REQUESTING A VFR PRACTICE APCH. I ASKED SMA X IF HE STILL HAD SMT Y IN SIGHT. SMA X ADVISED ME THAT HE HAD LOST SIGHT OF THE TFC. SMT Y WAS A FASTER AIRPLANE THAN SMA X AND APPEARED TO BE ALMOST 3 MI AHEAD SMA X. I FEEL THAT THIS SITUATION COULD HAVE BEEN AVOIDED BY OPENING THE FINAL W SECTOR BEFORE THE LEVEL OF COMPLEXITY GOT TO SUCH OF A DIFFICULT LEVEL BY HAVING A MODERATE TO HVY WORKLOAD WHEN THE SECTOR WAS OPENED.
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.