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ZID controller experienced operational error at FL270 when attention was diverted and spacing judgement inaccurate.
| Attributes | |
| ACN | 652164 |
| Time | |
| Date | 200503 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hyk.vortac |
| State Reference | KY |
| Altitude | msl single value : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | IAI1124/1124A/Westwind |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 3.5 controller non radar : 2 controller radar : 16 controller time certified in position1 : 18 |
| ASRS Report | 652164 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| 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 : 13200 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X ssw bound at FL270; level flight. The previous sector asked what altitude on an mgy inbound aircraft Y. I told them to handle him like a day inbound. The rbl sector had problems spacing cvg inbounds on a flash through procedure through my sector which diverted my attention. I had coordination on another day inbound on a vector for additional traffic. I decided that I had plenty of time to descend aircraft Y below aircraft X; so I issued FL260 to get below the FL270 traffic. I vectored 2 aircraft in the northern part of the sector at FL320 and when I got back to aircraft Y; he didn't descend as I expected. I expedited his descent to FL260 and tried to get a report level and was unable.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL270 WHEN ATTN WAS DIVERTED AND SPACING JUDGEMENT INACCURATE.
Narrative: ACFT X SSW BOUND AT FL270; LEVEL FLT. THE PREVIOUS SECTOR ASKED WHAT ALT ON AN MGY INBOUND ACFT Y. I TOLD THEM TO HANDLE HIM LIKE A DAY INBOUND. THE RBL SECTOR HAD PROBS SPACING CVG INBOUNDS ON A FLASH THROUGH PROC THROUGH MY SECTOR WHICH DIVERTED MY ATTN. I HAD COORD ON ANOTHER DAY INBOUND ON A VECTOR FOR ADDITIONAL TFC. I DECIDED THAT I HAD PLENTY OF TIME TO DSND ACFT Y BELOW ACFT X; SO I ISSUED FL260 TO GET BELOW THE FL270 TFC. I VECTORED 2 ACFT IN THE NORTHERN PART OF THE SECTOR AT FL320 AND WHEN I GOT BACK TO ACFT Y; HE DIDN'T DSND AS I EXPECTED. I EXPEDITED HIS DSCNT TO FL260 AND TRIED TO GET A RPT LEVEL AND WAS UNABLE.
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.