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A B727 starts its descent from FL290 on schedule over psb VOR only to have the TCASII detect an aircraft below at FL280. TCASII and the center controller detect the operational error at the same time.
| Attributes | |
| ACN | 430051 |
| Time | |
| Date | 199903 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : psb.vortac |
| State Reference | PA |
| Altitude | msl bound lower : 28700 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level cruise : enroute altitude change descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 19000 flight time type : 9000 |
| ASRS Report | 430051 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar / mode c aircraft equipment : tcas other controllera other flight crewa other flight crewb other other : 3 |
| Resolutory Action | controller : issued new clearance controller : separated traffic controller : issued advisory flight crew : took evasive action |
| Miss Distance | horizontal : 0 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
Center had cleared us from FL290 to cross FL230 at 35 NM northeast of philipsburg. First officer started the descent over psb and TCASII gave a TA at FL287. Simultaneously, center asked if we had 'started descent' and to 'climb back to FL290.' we had already leveled and climbed back to FL290 as center was talking. Another aircraft had appeared on TCASII directly below us. Center then cleared us to the next sector which then gave us another descent clearance.
Original NASA ASRS Text
Title: A B727 STARTS ITS DSCNT FROM FL290 ON SCHEDULE OVER PSB VOR ONLY TO HAVE THE TCASII DETECT AN ACFT BELOW AT FL280. TCASII AND THE CTR CTLR DETECT THE OPERROR AT THE SAME TIME.
Narrative: CTR HAD CLRED US FROM FL290 TO CROSS FL230 AT 35 NM NE OF PHILIPSBURG. FO STARTED THE DSCNT OVER PSB AND TCASII GAVE A TA AT FL287. SIMULTANEOUSLY, CTR ASKED IF WE HAD 'STARTED DSCNT' AND TO 'CLB BACK TO FL290.' WE HAD ALREADY LEVELED AND CLBED BACK TO FL290 AS CTR WAS TALKING. ANOTHER ACFT HAD APPEARED ON TCASII DIRECTLY BELOW US. CTR THEN CLRED US TO THE NEXT SECTOR WHICH THEN GAVE US ANOTHER DSCNT CLRNC.
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.