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Pct controller experienced operational error at 4000 ft when anticipated course divergence failed between arrival and departure aircraft.
| Attributes | |
| ACN | 691032 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ric.vortac |
| State Reference | VA |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : pct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 10 controller radar : 7 |
| ASRS Report | 691032 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 9000 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y checked in (arrival ric). Aircraft X (ric departure) climbing out. Both aircraft assigned 4000 ft. Course divergence was anticipated. Both aircraft's proximity caused ATC 'collision alarm.' perception of controller was that courses diverged (departure heading 280 degrees; arrival 035 degrees). Pilot of arrival stated traffic in sight and 'passing behind.' investigation discovered loss of separation without proper divergence; at time of 'conflict alert' alarm.
Original NASA ASRS Text
Title: PCT CTLR EXPERIENCED OPERROR AT 4000 FT WHEN ANTICIPATED COURSE DIVERGENCE FAILED BTWN ARR AND DEP ACFT.
Narrative: ACFT Y CHKED IN (ARR RIC). ACFT X (RIC DEP) CLBING OUT. BOTH ACFT ASSIGNED 4000 FT. COURSE DIVERGENCE WAS ANTICIPATED. BOTH ACFT'S PROX CAUSED ATC 'COLLISION ALARM.' PERCEPTION OF CTLR WAS THAT COURSES DIVERGED (DEP HDG 280 DEGS; ARR 035 DEGS). PLT OF ARR STATED TFC IN SIGHT AND 'PASSING BEHIND.' INVESTIGATION DISCOVERED LOSS OF SEPARATION WITHOUT PROPER DIVERGENCE; AT TIME OF 'CONFLICT ALERT' ALARM.
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.