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ARTCC controller changed an altitude on an aircraft and did not receive an acknowledgement. Aircraft climbed to original assigned altitude which resulted in less than standard separation from a descending aircraft.
| Attributes | |
| ACN | 156117 |
| Time | |
| Date | 199009 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ign |
| State Reference | NY |
| Altitude | msl bound lower : 27000 msl bound upper : 27000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 156117 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar |
| ASRS Report | 155757 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I accepted a handoff on medium large transport X climbing to FL230. On initial contact I issued a clearance to FL280. I reclred the aircraft to FL260 but did not hear the readback. I was distracted by other aircraft calling and override calls and did not reconfirm the altitude. I subsequently cleared an aircraft to FL270. I changed aircraft a to the next controller's frequency and did not realize that he was climbing through FL260 until the data block showed FL266. At that time, medium large transport Y was descending through FL277 and I issued a climb to FL280 but sep was lost.
Original NASA ASRS Text
Title: ARTCC CTLR CHANGED AN ALT ON AN ACFT AND DID NOT RECEIVE AN ACKNOWLEDGEMENT. ACFT CLIMBED TO ORIGINAL ASSIGNED ALT WHICH RESULTED IN LESS THAN STANDARD SEPARATION FROM A DESCENDING ACFT.
Narrative: I ACCEPTED A HDOF ON MLG X CLBING TO FL230. ON INITIAL CONTACT I ISSUED A CLRNC TO FL280. I RECLRED THE ACFT TO FL260 BUT DID NOT HEAR THE READBACK. I WAS DISTRACTED BY OTHER ACFT CALLING AND OVERRIDE CALLS AND DID NOT RECONFIRM THE ALT. I SUBSEQUENTLY CLRED AN ACFT TO FL270. I CHANGED ACFT A TO THE NEXT CTLR'S FREQ AND DID NOT REALIZE THAT HE WAS CLBING THROUGH FL260 UNTIL THE DATA BLOCK SHOWED FL266. AT THAT TIME, MLG Y WAS DSNDING THROUGH FL277 AND I ISSUED A CLB TO FL280 BUT SEP WAS LOST.
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.