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Less than standard separation when large transport is descended through altitude of widebody transport with insufficient lateral separation.
| Attributes | |
| ACN | 87133 |
| Time | |
| Date | 198804 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mie |
| State Reference | IN |
| Altitude | msl bound lower : 35000 msl bound upper : 33600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 1 |
| ASRS Report | 87133 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 17400 vertical : 1400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Large transport X enroute from dfw to dtw at FL370. Widebody transport Y enroute from lga to lax at FL350. I descended large transport X to FL290 told pilot to give me a good rate to avoid a turn. The aircraft was in confliction. I recognized that from the start but failed to initiate a turn soon enough to keep standard separation. Both aircraft were turned but not enough and too late. Separation was lost and aedp was activated. To keep this from happening again my judgement as a controller needs to (and is and will) improve each day. This error was completely due to poor planning on my part.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN LGT IS DESCENDED THROUGH ALT OF WDB WITH INSUFFICIENT LATERAL SEPARATION.
Narrative: LGT X ENROUTE FROM DFW TO DTW AT FL370. WDB Y ENROUTE FROM LGA TO LAX AT FL350. I DESCENDED LGT X TO FL290 TOLD PLT TO GIVE ME A GOOD RATE TO AVOID A TURN. THE ACFT WAS IN CONFLICTION. I RECOGNIZED THAT FROM THE START BUT FAILED TO INITIATE A TURN SOON ENOUGH TO KEEP STANDARD SEPARATION. BOTH ACFT WERE TURNED BUT NOT ENOUGH AND TOO LATE. SEPARATION WAS LOST AND AEDP WAS ACTIVATED. TO KEEP THIS FROM HAPPENING AGAIN MY JUDGEMENT AS A CTLR NEEDS TO (AND IS AND WILL) IMPROVE EACH DAY. THIS ERROR WAS COMPLETELY DUE TO POOR PLANNING ON MY PART.
Data retrieved from NASA's ASRS site as of August 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.