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ZID controller experienced operational error when sector above descended aircraft into reporter's airspace; thinking the aircraft was stopped at sector base altitude.
| Attributes | |
| ACN | 733547 |
| Time | |
| Date | 200703 |
| Place | |
| Locale Reference | navaid : hvq.vortac |
| State Reference | WV |
| Altitude | msl bound lower : 35000 msl bound upper : 36000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 135 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar controller : military |
| Experience | controller military : 6 controller radar : 9 |
| ASRS Report | 733547 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28020 vertical : 100 |
| Supplementary | |
| Problem Areas | Weather Environmental Factor ATC Human Performance |
| Primary Problem | FAA |
| Air Traffic Incident | Operational Error |
Narrative:
My sector owns FL320-FL350. The sector above mine descended aircraft #2 to FL340; but the controller meant to descend to the bottom fl of that sector (FL360). Aircraft #2 checked on to my frequency 'descending' to FL340. The data block showed FL360. I attempted to stop the pilot's descent; but pilot was anxious to get out of chop and was descending rapidly. Aircraft #2 descended through aircraft #1 altitude (FL350). I turned aircraft #1 30 degrees right and instructed aircraft #2 to maintain FL360. Separation was lost.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR WHEN SECTOR ABOVE DESCENDED ACFT INTO REPORTER'S AIRSPACE; THINKING THE ACFT WAS STOPPED AT SECTOR BASE ALT.
Narrative: MY SECTOR OWNS FL320-FL350. THE SECTOR ABOVE MINE DSNDED ACFT #2 TO FL340; BUT THE CTLR MEANT TO DSND TO THE BOTTOM FL OF THAT SECTOR (FL360). ACFT #2 CHKED ON TO MY FREQ 'DSNDING' TO FL340. THE DATA BLOCK SHOWED FL360. I ATTEMPTED TO STOP THE PLT'S DSCNT; BUT PLT WAS ANXIOUS TO GET OUT OF CHOP AND WAS DSNDING RAPIDLY. ACFT #2 DSNDED THROUGH ACFT #1 ALT (FL350). I TURNED ACFT #1 30 DEGS R AND INSTRUCTED ACFT #2 TO MAINTAIN FL360. SEPARATION WAS LOST.
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.