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2 aircraft approaching head-on. Controller descended both aircraft, which resulted in less than standard separation.
| Attributes | |
| ACN | 147027 |
| Time | |
| Date | 199005 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rod |
| State Reference | OH |
| Altitude | msl bound lower : 27000 msl bound upper : 27600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 1 |
| ASRS Report | 147027 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 20400 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Light transport was 20 east of rod VORTAC at FL280, while medium large transport was 20 southwest rod VORTAC at FL290. Light transport was descended to FL260. The medium large transport was descended to FL270. Controller was relieved. I then assumed the position (fully briefed of the conflict) and obtained a report of light transport leaving FL270. No further action was taken feeling rule 6-50 of ATP 7110.65F was applicable since at the time of the report medium large transport was still above FL280! My perception was that it would be redundant to reclr medium large transport to FL270 when he was already cleared to that altitude after I obtained the report form light transport leaving FL270. My perception of the rule (6-50 7110.65F) was inadequate!
Original NASA ASRS Text
Title: 2 ACFT APCHING HEAD-ON. CTLR DESCENDED BOTH ACFT, WHICH RESULTED IN LESS THAN STANDARD SEPARATION.
Narrative: LTT WAS 20 E OF ROD VORTAC AT FL280, WHILE MLG WAS 20 SW ROD VORTAC AT FL290. LTT WAS DSNDED TO FL260. THE MLG WAS DSNDED TO FL270. CTLR WAS RELIEVED. I THEN ASSUMED THE POS (FULLY BRIEFED OF THE CONFLICT) AND OBTAINED A RPT OF LTT LEAVING FL270. NO FURTHER ACTION WAS TAKEN FEELING RULE 6-50 OF ATP 7110.65F WAS APPLICABLE SINCE AT THE TIME OF THE RPT MLG WAS STILL ABOVE FL280! MY PERCEPTION WAS THAT IT WOULD BE REDUNDANT TO RECLR MLG TO FL270 WHEN HE WAS ALREADY CLRED TO THAT ALT AFTER I OBTAINED THE RPT FORM LTT LEAVING FL270. MY PERCEPTION OF THE RULE (6-50 7110.65F) WAS INADEQUATE!
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.