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D01 controller utilized visual separation techniques with arrival and departure traffic resulting in TCASII maneuver by 1 aircraft.
| Attributes | |
| ACN | 626519 |
| Time | |
| Date | 200408 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : den.vor |
| State Reference | CO |
| Altitude | msl single value : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller limited radar : 2 controller military : 4 controller radar : 17 controller supervisory : 1 |
| ASRS Report | 626519 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued advisory flight crew : took evasive action |
| Supplementary | |
| Problem Areas | FAA Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Aircraft X, B190, on a 090 degree heading to join a SID. Aircraft Y, B777, on STAR descending to 13000 ft. Aircraft X climbing to 23000 ft. Anticipating separation on climb and to cross behind. Aircraft Y stopped his descent about 16400 ft. Aircraft X saw the traffic and was told to maintain visual separation with the traffic. Aircraft X proceeded on course normally. Aircraft X climbed behind the traffic but aircraft Y climbed also closing the event. Aircraft X told me it was easy to miss the aircraft Y and indicated no complaint.
Original NASA ASRS Text
Title: D01 CTLR UTILIZED VISUAL SEPARATION TECHNIQUES WITH ARR AND DEP TFC RESULTING IN TCASII MANEUVER BY 1 ACFT.
Narrative: ACFT X, B190, ON A 090 DEG HDG TO JOIN A SID. ACFT Y, B777, ON STAR DSNDING TO 13000 FT. ACFT X CLBING TO 23000 FT. ANTICIPATING SEPARATION ON CLB AND TO CROSS BEHIND. ACFT Y STOPPED HIS DSCNT ABOUT 16400 FT. ACFT X SAW THE TFC AND WAS TOLD TO MAINTAIN VISUAL SEPARATION WITH THE TFC. ACFT X PROCEEDED ON COURSE NORMALLY. ACFT X CLBED BEHIND THE TFC BUT ACFT Y CLBED ALSO CLOSING THE EVENT. ACFT X TOLD ME IT WAS EASY TO MISS THE ACFT Y AND INDICATED NO COMPLAINT.
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.