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Loss of separation situation when reporter forgot air carrier Y at FL290 and descended air carrier X from FL310 to FL240 without appropriate lateral separation.
| Attributes | |
| ACN | 388586 |
| Time | |
| Date | 199712 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : ape |
| State Reference | OH |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 10 |
| ASRS Report | 388586 |
| 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 | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 23400 vertical : 1600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I forgot about air carrier Y at FL290 and descended air carrier X down to FL240. Air carrier X was 4 mi south of air carrier Y.
Original NASA ASRS Text
Title: LOSS OF SEPARATION SIT WHEN RPTR FORGOT ACR Y AT FL290 AND DSNDED ACR X FROM FL310 TO FL240 WITHOUT APPROPRIATE LATERAL SEPARATION.
Narrative: I FORGOT ABOUT ACR Y AT FL290 AND DSNDED ACR X DOWN TO FL240. ACR X WAS 4 MI S OF ACR Y.
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.