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Reporter coordination to have aircraft X descend to FL270 due to converging aircraft Y traffic. Reporter then noticed aircraft Z traffic at FL270 which was a factor with aircraft X. Reporter coordination that aircraft X stop at FL280. For whatever reason, aircraft X came over to reporter's sector out of FL280 for FL270. Separation was lost between aircraft X and aircraft Z.
| Attributes | |
| ACN | 441396 |
| Time | |
| Date | 199906 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : bkw.vortac |
| State Reference | WV |
| Altitude | msl bound lower : 27000 msl bound upper : 28600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar |
| Experience | controller limited radar : 15 controller radar : 14 |
| ASRS Report | 441396 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | flight crew : took evasive action none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 11400 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure Operational Error |
Narrative:
Sat down to work sector L37. Called bkw sector 3 times to move air carrier X who was at FL290 because of converging traffic at FL290. On fourth call, bkw answered. I told them to descend air carrier X to FL270. After completing the coordination, I noticed traffic at FL270 for air carrier X. I called bkw back, with air carrier X now leaving FL286 for FL270, to stop air carrier X at FL280. They said 'ok.' air carrier X called on leaving FL280 for FL270. He got with air carrier Y. Right side climbed air carrier X back to FL280.
Original NASA ASRS Text
Title: RPTR COORD TO HAVE ACFT X DSND TO FL270 DUE TO CONVERGING ACFT Y TFC. RPTR THEN NOTICED ACFT Z TFC AT FL270 WHICH WAS A FACTOR WITH ACFT X. RPTR COORD THAT ACFT X STOP AT FL280. FOR WHATEVER REASON, ACFT X CAME OVER TO RPTR'S SECTOR OUT OF FL280 FOR FL270. SEPARATION WAS LOST BTWN ACFT X AND ACFT Z.
Narrative: SAT DOWN TO WORK SECTOR L37. CALLED BKW SECTOR 3 TIMES TO MOVE ACR X WHO WAS AT FL290 BECAUSE OF CONVERGING TFC AT FL290. ON FOURTH CALL, BKW ANSWERED. I TOLD THEM TO DSND ACR X TO FL270. AFTER COMPLETING THE COORD, I NOTICED TFC AT FL270 FOR ACR X. I CALLED BKW BACK, WITH ACR X NOW LEAVING FL286 FOR FL270, TO STOP ACR X AT FL280. THEY SAID 'OK.' ACR X CALLED ON LEAVING FL280 FOR FL270. HE GOT WITH ACR Y. R SIDE CLBED ACR X BACK TO FL280.
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.