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Air carrier descent through occupied altitude had less than standard separation from cpr X. System error.
| Attributes | |
| ACN | 275062 |
| Time | |
| Date | 199406 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : esl |
| State Reference | WV |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : sfo |
| Operator | general aviation : corporate |
| Make Model Name | Cessna Citation Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 5 controller non radar : 3 controller radar : 3 |
| ASRS Report | 275062 |
| Person 2 | |
| Affiliation | Other |
| 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 | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24372 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Bwi arrs were deviating into a holding aircraft cpr X. X was turning and descended to FL220 an available altitude in the holding space. The bwi arrival was turned and missed by approximately 6 mi. X was climbed back to FL230 to avoid traffic deviating into the holding pattern from the south. Air carrier Y in the holding pattern at FL230 could not stay at the fix due to WX building was vectored out of the airspace and descended to FL210 to avoid X and a deviating from the south at FL220. Other control actions were taking place with aircraft deviating from pit into my airspace and the bwi arrival was vectored again to avoid a deal then X or Y passed with not enough space.
Original NASA ASRS Text
Title: ACR DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM CPR X. SYS ERROR.
Narrative: BWI ARRS WERE DEVIATING INTO A HOLDING ACFT CPR X. X WAS TURNING AND DSNDED TO FL220 AN AVAILABLE ALT IN THE HOLDING SPACE. THE BWI ARR WAS TURNED AND MISSED BY APPROX 6 MI. X WAS CLBED BACK TO FL230 TO AVOID TFC DEVIATING INTO THE HOLDING PATTERN FROM THE S. ACR Y IN THE HOLDING PATTERN AT FL230 COULD NOT STAY AT THE FIX DUE TO WX BUILDING WAS VECTORED OUT OF THE AIRSPACE AND DSNDED TO FL210 TO AVOID X AND A DEVIATING FROM THE S AT FL220. OTHER CTL ACTIONS WERE TAKING PLACE WITH ACFT DEVIATING FROM PIT INTO MY AIRSPACE AND THE BWI ARR WAS VECTORED AGAIN TO AVOID A DEAL THEN X OR Y PASSED WITH NOT ENOUGH SPACE.
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.