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Cpr Y descent through occupied altitude had less than standard separation from cpr X. Evasive action taken.
| Attributes | |
| ACN | 251360 |
| Time | |
| Date | 199309 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : esl |
| State Reference | WV |
| Altitude | msl bound lower : 26000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob artcc : uhcz |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 2 controller radar : 7 |
| ASRS Report | 251360 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 16800 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Cpr X was swbound, level FL260. Cpr Y inbound to dca checked on descending to FL350. I cleared cpr Y direct esl, cross 25 mi northwest esl at FL290. Cpr Y read back FL250 and I missed it. I frequency changed cpr Y to next sector. About 1 1/2 mins later the conflict alert activated. Attempts to call next sector failed.
Original NASA ASRS Text
Title: CPR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM CPR X. EVASIVE ACTION TAKEN.
Narrative: CPR X WAS SWBOUND, LEVEL FL260. CPR Y INBOUND TO DCA CHKED ON DSNDING TO FL350. I CLRED CPR Y DIRECT ESL, CROSS 25 MI NW ESL AT FL290. CPR Y READ BACK FL250 AND I MISSED IT. I FREQ CHANGED CPR Y TO NEXT SECTOR. ABOUT 1 1/2 MINS LATER THE CONFLICT ALERT ACTIVATED. ATTEMPTS TO CALL NEXT SECTOR FAILED.
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.