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Cpr X climb through occupied altitude had less than standard separation from VFR small aircraft Y in TCA. System error.
| Attributes | |
| ACN | 253602 |
| Time | |
| Date | 199310 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bjc |
| State Reference | CO |
| Altitude | msl bound lower : 7500 msl bound upper : 7500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den tower : bjc |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| ASRS Report | 253602 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure other |
Narrative:
Jeffco tower (VFR tower) must obtain an IFR release from den approach to let IFR aircraft go. Jeffco tower did obtain this release for cpr X 'subject visual separation between small aircraft Y 2 mi south' -- being vectored by den approach at 7500 ft MSL. The IFR was climbing to 8000 ft MSL. Jeffco tower pointed out the traffic to cpr X and had both aircraft in sight and determined that they wouldn't hit each other. Cpr X was changed to den approach control. Shortly thereafter, den approach told us that cpr X went 'right by' the small aircraft Y. I (jeffco tower) still had both aircraft visually. They were well apart. (Merging targets on radar can be safely far apart and you can visually see that.) this was mainly a difference of definition between den approach and jeffco tower.
Original NASA ASRS Text
Title: CPR X CLB THROUGH OCCUPIED ALT HAD LTSS FROM VFR SMA Y IN TCA. SYS ERROR.
Narrative: JEFFCO TWR (VFR TWR) MUST OBTAIN AN IFR RELEASE FROM DEN APCH TO LET IFR ACFT GO. JEFFCO TWR DID OBTAIN THIS RELEASE FOR CPR X 'SUBJECT VISUAL SEPARATION BTWN SMA Y 2 MI S' -- BEING VECTORED BY DEN APCH AT 7500 FT MSL. THE IFR WAS CLBING TO 8000 FT MSL. JEFFCO TWR POINTED OUT THE TFC TO CPR X AND HAD BOTH ACFT IN SIGHT AND DETERMINED THAT THEY WOULDN'T HIT EACH OTHER. CPR X WAS CHANGED TO DEN APCH CTL. SHORTLY THEREAFTER, DEN APCH TOLD US THAT CPR X WENT 'RIGHT BY' THE SMA Y. I (JEFFCO TWR) STILL HAD BOTH ACFT VISUALLY. THEY WERE WELL APART. (MERGING TARGETS ON RADAR CAN BE SAFELY FAR APART AND YOU CAN VISUALLY SEE THAT.) THIS WAS MAINLY A DIFFERENCE OF DEFINITION BTWN DEN APCH AND JEFFCO TWR.
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.