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ZOB controller experienced operational error at FL320 when last min altitude change was issued; but blocked; and separation was lost.
| Attributes | |
| ACN | 690238 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : djb.vortac |
| State Reference | OH |
| Altitude | msl single value : 32000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 20 |
| ASRS Report | 690238 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I amended air carrier Y to FL330 because air carrier X flashed to me on a handoff at FL320. Air carrier Y said blocked. I repeated. Air carrier Y read back FL320. Separation was lost. I tried to quickly descend air carrier Y. Separation lost right away.
Original NASA ASRS Text
Title: ZOB CTLR EXPERIENCED OPERROR AT FL320 WHEN LAST MIN ALT CHANGE WAS ISSUED; BUT BLOCKED; AND SEPARATION WAS LOST.
Narrative: I AMENDED ACR Y TO FL330 BECAUSE ACR X FLASHED TO ME ON A HDOF AT FL320. ACR Y SAID BLOCKED. I REPEATED. ACR Y READ BACK FL320. SEPARATION WAS LOST. I TRIED TO QUICKLY DSND ACR Y. SEPARATION LOST RIGHT AWAY.
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.