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Loss of separation between a descending LR25 and a DC9 at FL210. LR25 miscopied clearance as FL200 vice FL220.
| Attributes | |
| ACN | 389449 |
| Time | |
| Date | 199710 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cle |
| State Reference | OH |
| Altitude | msl bound lower : 21000 msl bound upper : 21000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 12 controller radar : 10 |
| ASRS Report | 389449 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : published procedure non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 4800 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
An LR25 landing at cleveland was cleared to FL220, the pilot read back FL200. I issued traffic to the LR25 opposite direction at FL210, a DC9, that had been temporarily stopped to get the LR25 started down. I went off line to answer a coordination line and the LR25 questioned the altitude assignment (per traffic issued). The pilot did not question it again and the operational error occurred.
Original NASA ASRS Text
Title: LOSS OF SEPARATION BTWN A DSNDING LR25 AND A DC9 AT FL210. LR25 MISCOPIED CLRNC AS FL200 VICE FL220.
Narrative: AN LR25 LNDG AT CLEVELAND WAS CLRED TO FL220, THE PLT READ BACK FL200. I ISSUED TFC TO THE LR25 OPPOSITE DIRECTION AT FL210, A DC9, THAT HAD BEEN TEMPORARILY STOPPED TO GET THE LR25 STARTED DOWN. I WENT OFF LINE TO ANSWER A COORD LINE AND THE LR25 QUESTIONED THE ALT ASSIGNMENT (PER TFC ISSUED). THE PLT DID NOT QUESTION IT AGAIN AND THE OPERROR 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.