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ZOB issues descent clearance to an F100 to resolve a conflict with a DC9 by descending the F100. Action was not sufficient time to ensure separation.
| Attributes | |
| ACN | 460785 |
| Time | |
| Date | 200001 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | NY |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | pilot : private |
| Experience | controller non radar : 3 controller radar : 14 controller time certified in position1 : 7 flight time total : 170 |
| ASRS Report | 460785 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28200 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft was going to be in conflict with other aircraft in the next sector. I made a decision to descend him to resolve the situation. Traffic was issued and descent clearance. Reply was 'roger, we see him, we're diving below him.' aircraft reported level at FL270 approximately 6 seconds after separation was lost.
Original NASA ASRS Text
Title: ZOB ISSUES DSCNT CLRNC TO AN F100 TO RESOLVE A CONFLICT WITH A DC9 BY DSNDING THE F100. ACTION WAS NOT SUFFICIENT TIME TO ENSURE SEPARATION.
Narrative: ACFT WAS GOING TO BE IN CONFLICT WITH OTHER ACFT IN THE NEXT SECTOR. I MADE A DECISION TO DSND HIM TO RESOLVE THE SIT. TFC WAS ISSUED AND DSCNT CLRNC. REPLY WAS 'ROGER, WE SEE HIM, WE'RE DIVING BELOW HIM.' ACFT RPTED LEVEL AT FL270 APPROX 6 SECONDS AFTER SEPARATION 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.