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Cpr Y descent through occupied altitude had less than standard separation from air carrier X TCASII RA climb. Evasive action taken. System error.
| Attributes | |
| ACN | 245626 |
| Time | |
| Date | 199307 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ard |
| State Reference | PA |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zdc |
| 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 | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 57 flight time total : 18500 flight time type : 8000 |
| ASRS Report | 245626 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 7000 flight time type : 3000 |
| ASRS Report | 245621 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : required legal separation non adherence : clearance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew faa : investigated |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
Air carrier X approaching yardley VOR at 11000 ft we received a TCASII TA (12 O'clock and 1000 ft above and descending). That was followed by a 'traffic climb' warning. We were directed via TCASII to climb at 2000 FPM. We then received a 'clear of traffic' from TCASII. When first TCASII alert was sounded we advised ATC on 132.52 and were advised of unknown traffic at 12 O'clock. After we took evasive action we informed ATC. They then confirmed cpr Y being controled by another sector had indeed descended through our assigned altitude. His last comment was 'good call.'
Original NASA ASRS Text
Title: CPR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X TCASII RA CLB. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: ACR X APCHING YARDLEY VOR AT 11000 FT WE RECEIVED A TCASII TA (12 O'CLOCK AND 1000 FT ABOVE AND DSNDING). THAT WAS FOLLOWED BY A 'TFC CLB' WARNING. WE WERE DIRECTED VIA TCASII TO CLB AT 2000 FPM. WE THEN RECEIVED A 'CLR OF TFC' FROM TCASII. WHEN FIRST TCASII ALERT WAS SOUNDED WE ADVISED ATC ON 132.52 AND WERE ADVISED OF UNKNOWN TFC AT 12 O'CLOCK. AFTER WE TOOK EVASIVE ACTION WE INFORMED ATC. THEY THEN CONFIRMED CPR Y BEING CTLED BY ANOTHER SECTOR HAD INDEED DSNDED THROUGH OUR ASSIGNED ALT. HIS LAST COMMENT WAS 'GOOD CALL.'
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.