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ZDC ARTCC radar controller uses a 5 mi j-ring (measuring tool) on wrong aircraft and has a loss of separation.
| Attributes | |
| ACN | 549423 |
| Time | |
| Date | 200206 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ott.vortac |
| State Reference | MD |
| Altitude | msl bound lower : 12500 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 15 |
| ASRS Report | 549423 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 level 13000 ft inbound phl, aircraft #2 descending from 14000 ft to 11000 ft. Aircraft #2 told to descend through 12000 ft in 30 seconds or less. I had a 5 mi j-ring on an aircraft which I thought was aircraft #1. 5 mi ring was on other aircraft. This caused a misjudgement in distance from aircraft #1 and aircraft #2. From the information I was looking at, I thought the aircraft were approximately 9 mi apart.
Original NASA ASRS Text
Title: ZDC ARTCC RADAR CTLR USES A 5 MI J-RING (MEASURING TOOL) ON WRONG ACFT AND HAS A LOSS OF SEPARATION.
Narrative: ACFT #1 LEVEL 13000 FT INBOUND PHL, ACFT #2 DSNDING FROM 14000 FT TO 11000 FT. ACFT #2 TOLD TO DSND THROUGH 12000 FT IN 30 SECONDS OR LESS. I HAD A 5 MI J-RING ON AN ACFT WHICH I THOUGHT WAS ACFT #1. 5 MI RING WAS ON OTHER ACFT. THIS CAUSED A MISJUDGEMENT IN DISTANCE FROM ACFT #1 AND ACFT #2. FROM THE INFO I WAS LOOKING AT, I THOUGHT THE ACFT WERE APPROX 9 MI APART.
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.