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TRACON controller failed to provide standard separation between 2 aircraft that he was vectoring to the final ILS approach fix.
| Attributes | |
| ACN | 149360 |
| Time | |
| Date | 199006 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : rdu |
| State Reference | NC |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : rdu tower : cae |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 5 |
| ASRS Report | 149360 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Medium large transport was vectored to follow light transport. ILS approachs were in use, so I was giving final radar controller in trail spacing. When I turned medium large transport to follow the light transport, I thought that standard sep would exist. I descended medium large transport to 8000', same altitude as the light transport. As sep started decreasing, I instructed medium large transport to maintain 9000', and by the time the pilots responded to this instruction less than standard separation occurred and the light transport was turned to avoid any further incident. I do not think that ZDC was in compliance with our LOA's to cross the arrival fix at 250 KTS. When I asked the center about the speeds, his reply was, 'I'm trying.'
Original NASA ASRS Text
Title: TRACON CTLR FAILED TO PROVIDE STANDARD SEPARATION BETWEEN 2 ACFT THAT HE WAS VECTORING TO THE FINAL ILS APCH FIX.
Narrative: MLG WAS VECTORED TO FOLLOW LTT. ILS APCHS WERE IN USE, SO I WAS GIVING FINAL RADAR CTLR IN TRAIL SPACING. WHEN I TURNED MLG TO FOLLOW THE LTT, I THOUGHT THAT STANDARD SEP WOULD EXIST. I DSNDED MLG TO 8000', SAME ALT AS THE LTT. AS SEP STARTED DECREASING, I INSTRUCTED MLG TO MAINTAIN 9000', AND BY THE TIME THE PLTS RESPONDED TO THIS INSTRUCTION LTSS OCCURRED AND THE LTT WAS TURNED TO AVOID ANY FURTHER INCIDENT. I DO NOT THINK THAT ZDC WAS IN COMPLIANCE WITH OUR LOA'S TO CROSS THE ARR FIX AT 250 KTS. WHEN I ASKED THE CENTER ABOUT THE SPDS, HIS REPLY WAS, 'I'M TRYING.'
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.