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ZLC controller experienced loss of separation at FL210 when misreading data block information and climbing departure through previous departure aircraft.
| Attributes | |
| ACN | 701464 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zlc.artcc |
| State Reference | UT |
| Altitude | msl single value : 21000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | general aviation : personal |
| Make Model Name | PA-46 Malibu |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure controller : radar controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 701464 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert flight crew : took evasive action |
| Miss Distance | horizontal : 29280 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working R7; arrs and departures; into and out of salt lake approach. Aircraft X was a northbound departure (PA46) climbing to FL220; aircraft Y was a departing crj behind the PA46. Aircraft X requested FL240. As I issued him the climb; I thought he was out of FL210 (I saw 220N in the data block; mistaking it for 220C); so I stopped aircraft Y's climb at FL210. The conflict alert later activated. I initially turned aircraft Y 30 degrees right; then further turned him to a 090 degree heading (approximately 90 degrees right). I also instructed aircraft X to expedite his climb through FL220.
Original NASA ASRS Text
Title: ZLC CTLR EXPERIENCED LOSS OF SEPARATION AT FL210 WHEN MISREADING DATA BLOCK INFO AND CLBING DEP THROUGH PREVIOUS DEP ACFT.
Narrative: I WAS WORKING R7; ARRS AND DEPS; INTO AND OUT OF SALT LAKE APCH. ACFT X WAS A NBOUND DEP (PA46) CLBING TO FL220; ACFT Y WAS A DEPARTING CRJ BEHIND THE PA46. ACFT X REQUESTED FL240. AS I ISSUED HIM THE CLB; I THOUGHT HE WAS OUT OF FL210 (I SAW 220N IN THE DATA BLOCK; MISTAKING IT FOR 220C); SO I STOPPED ACFT Y'S CLB AT FL210. THE CONFLICT ALERT LATER ACTIVATED. I INITIALLY TURNED ACFT Y 30 DEGS R; THEN FURTHER TURNED HIM TO A 090 DEG HDG (APPROX 90 DEGS R). I ALSO INSTRUCTED ACFT X TO EXPEDITE HIS CLB THROUGH FL220.
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.