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Reporter lost standard separation between an overflt and a descending inbound aircraft, even though vectors were given to both aircraft X and Y.
| Attributes | |
| ACN | 439129 |
| Time | |
| Date | 199906 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ape.vortac |
| State Reference | OH |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 3 controller time certified in position1 : 2 |
| ASRS Report | 439129 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 25800 vertical : 800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The sector had 5 aircraft on J80 at FL310. I took handoffs on 2 aircraft at FL330 flying eastbound approximately 3 mi north of J80. Both aircraft were pit arrs and are required to descend to FL240. I also took a handoff on an aircraft Z, dtw departure climbing to FL290. I climbed the aircraft Z to FL330, anticipating descending the pit inbounds. However, the wbound overflts were in confliction with the pit arrs (if descending). So I turned the second aircraft X left, to go behind the aircraft Z and to get away from the aircraft Y. Once I saw the turn take effect, I descended the aircraft X to FL240. The left turn issued was not enough, so I then turned the first aircraft Y to the left. Separation was lost. If I had left the aircraft at their handoff altitudes and waited for all the aircraft to pass laterally, an operational error wouldn't have occurred.
Original NASA ASRS Text
Title: RPTR LOST STANDARD SEPARATION BTWN AN OVERFLT AND A DSNDING INBOUND ACFT, EVEN THOUGH VECTORS WERE GIVEN TO BOTH ACFT X AND Y.
Narrative: THE SECTOR HAD 5 ACFT ON J80 AT FL310. I TOOK HDOFS ON 2 ACFT AT FL330 FLYING EBOUND APPROX 3 MI N OF J80. BOTH ACFT WERE PIT ARRS AND ARE REQUIRED TO DSND TO FL240. I ALSO TOOK A HDOF ON AN ACFT Z, DTW DEP CLBING TO FL290. I CLBED THE ACFT Z TO FL330, ANTICIPATING DSNDING THE PIT INBOUNDS. HOWEVER, THE WBOUND OVERFLTS WERE IN CONFLICTION WITH THE PIT ARRS (IF DSNDING). SO I TURNED THE SECOND ACFT X L, TO GO BEHIND THE ACFT Z AND TO GET AWAY FROM THE ACFT Y. ONCE I SAW THE TURN TAKE EFFECT, I DSNDED THE ACFT X TO FL240. THE L TURN ISSUED WAS NOT ENOUGH, SO I THEN TURNED THE FIRST ACFT Y TO THE L. SEPARATION WAS LOST. IF I HAD LEFT THE ACFT AT THEIR HDOF ALTS AND WAITED FOR ALL THE ACFT TO PASS LATERALLY, AN OPERROR WOULDN'T HAVE OCCURRED.
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.