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Loss of separation west of vhp, in, when an aircraft is cleared for a descent to an occupied altitude.
| Attributes | |
| ACN | 487735 |
| Time | |
| Date | 200010 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : vhp.vortac |
| State Reference | IN |
| Altitude | msl bound lower : 23000 msl bound upper : 23700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| 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 |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet CL65, Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | arrival star : tarne |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 12 controller time certified in position1 : 12 |
| ASRS Report | 487735 |
| 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 controllerb |
| Resolutory Action | controller : separated traffic controller : issued new clearance |
| Miss Distance | horizontal : 25200 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 on a 180 degree heading for spacing, aircraft #2 on the tarne arrival to cvg at FL240. About a 95 degree heading. I thought aircraft #1 was at FL220, when in fact it was at FL230. I descended aircraft #2 to FL230. I realized my mistake when aircraft #2 was at FL237. I stopped their descent and descended aircraft #1 to 17000 ft. Separation had been lost. Conflict alert never activated. If it had, I would have had time to stop aircraft #2's descent in time to prevent the error.
Original NASA ASRS Text
Title: LOSS OF SEPARATION W OF VHP, IN, WHEN AN ACFT IS CLRED FOR A DSCNT TO AN OCCUPIED ALT.
Narrative: ACFT #1 ON A 180 DEG HDG FOR SPACING, ACFT #2 ON THE TARNE ARR TO CVG AT FL240. ABOUT A 95 DEG HDG. I THOUGHT ACFT #1 WAS AT FL220, WHEN IN FACT IT WAS AT FL230. I DSNDED ACFT #2 TO FL230. I REALIZED MY MISTAKE WHEN ACFT #2 WAS AT FL237. I STOPPED THEIR DSCNT AND DSNDED ACFT #1 TO 17000 FT. SEPARATION HAD BEEN LOST. CONFLICT ALERT NEVER ACTIVATED. IF IT HAD, I WOULD HAVE HAD TIME TO STOP ACFT #2'S DSCNT IN TIME TO PREVENT THE ERROR.
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.