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Pct controller described near loss of separation at 13000 when adw arrival conflicted with dca departure; activating the ca.
| Attributes | |
| ACN | 748130 |
| Time | |
| Date | 200708 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pct.tracon |
| State Reference | VA |
| Altitude | msl single value : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pct.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : n/a |
| Flight Plan | IFR |
| Aircraft 2 | |
| 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 | climbout : initial climbout : takeoff |
| Route In Use | departure sid : n/a |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 20 |
| ASRS Report | 748130 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Miss Distance | horizontal : 12000 vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Aircraft X on the arrival for adw moving very fast was issued a descent. Aircraft Y was given a climb on initial contact to 170 expedite through 140 for traffic. Aircraft X closure rate appeared very fast. Traffic was issued with another expedite. Then aircraft X was turn to the north. Traffic was issue again and aircraft X and aircraft Y were turn away from each other. The ca alarmed aircraft X advised aircraft Y in sight. Told to maintain visual and resume the arrival. Separation was not lost but the closer rate apparently activated the conflict alert.
Original NASA ASRS Text
Title: PCT CTLR DESCRIBED NEAR LOSS OF SEPARATION AT 13000 WHEN ADW ARR CONFLICTED WITH DCA DEP; ACTIVATING THE CA.
Narrative: ACFT X ON THE ARR FOR ADW MOVING VERY FAST WAS ISSUED A DSCNT. ACFT Y WAS GIVEN A CLB ON INITIAL CONTACT TO 170 EXPEDITE THROUGH 140 FOR TFC. ACFT X CLOSURE RATE APPEARED VERY FAST. TFC WAS ISSUED WITH ANOTHER EXPEDITE. THEN ACFT X WAS TURN TO THE N. TFC WAS ISSUE AGAIN AND ACFT X AND ACFT Y WERE TURN AWAY FROM EACH OTHER. THE CA ALARMED ACFT X ADVISED ACFT Y IN SIGHT. TOLD TO MAINTAIN VISUAL AND RESUME THE ARR. SEPARATION WAS NOT LOST BUT THE CLOSER RATE APPARENTLY ACTIVATED THE CONFLICT ALERT.
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.