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Approach controller vectoring aircraft for final approach had less than standard separation and near midair collision by descending an atx light transport though altitude of an mdt.
| Attributes | |
| ACN | 156929 |
| Time | |
| Date | 199008 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sju |
| State Reference | PR |
| Altitude | msl bound lower : 2800 msl bound upper : 3100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : sju |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Light Transport |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 156929 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 300 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Mdt X on local to runway 10 at 3000' 15 mi from airport. Light transport Y on left downwind at 4000' heading 280 degree to follow an fgt on ILS approach to runway 8. Light transport X was turned to 350 degree heading and descended to 3100' to follow fgt. Light transport X was then turned to 020 degrees and descended to 1500'. Mdt X was crossing on light transport Y. Mdt X was turned to 180 degree heading, but light transport Y had not descended through 2000' and sep was lost. This occurred during the peak traffic period with a mix of military fighters, commercial jumbos, mdts, slow proximity (small transport's and light transport's) to converging runways. I probably could have used a coordinator, or had adjacent sectors hold aircraft out. Evasive action was necessary as aircraft passed with 300'.
Original NASA ASRS Text
Title: APCH CTLR VECTORING ACFT FOR FINAL APCH HAD LESS THAN STANDARD SEPARATION AND NMAC BY DESCENDING AN ATX LTT THOUGH ALT OF AN MDT.
Narrative: MDT X ON LCL TO RWY 10 AT 3000' 15 MI FROM ARPT. LTT Y ON LEFT DOWNWIND AT 4000' HDG 280 DEG TO FOLLOW AN FGT ON ILS APCH TO RWY 8. LTT X WAS TURNED TO 350 DEG HDG AND DSNDED TO 3100' TO FOLLOW FGT. LTT X WAS THEN TURNED TO 020 DEGS AND DSNDED TO 1500'. MDT X WAS XING ON LTT Y. MDT X WAS TURNED TO 180 DEG HDG, BUT LTT Y HAD NOT DSNDED THROUGH 2000' AND SEP WAS LOST. THIS OCCURRED DURING THE PEAK TFC PERIOD WITH A MIX OF MIL FIGHTERS, COMMERCIAL JUMBOS, MDTS, SLOW PROX (SMT'S AND LTT'S) TO CONVERGING RWYS. I PROBABLY COULD HAVE USED A COORDINATOR, OR HAD ADJACENT SECTORS HOLD ACFT OUT. EVASIVE ACTION WAS NECESSARY AS ACFT PASSED WITH 300'.
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.