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Air carrier X descent through occupied altitude TCASII RA had less than standard separation from Y. System error. Evasive action taken.
| Attributes | |
| ACN | 250248 |
| Time | |
| Date | 199308 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lch |
| State Reference | LA |
| Altitude | msl bound lower : 17500 msl bound upper : 17500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : zhu |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise 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 : 280 flight time total : 11000 flight time type : 5100 |
| ASRS Report | 250248 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 3000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
First officer was flying. Air carrier X was descending through FL180 when our TCASII warned us of 'traffic.' I pushed scale on TCASII to read 5 mi radius when we received an RA to climb at 2000 FPM. First officer pulled back. We were IMC at the time. I never saw traffic Y. Out of 18300 ft the TCASII stopped yelling at us. I called ZHU (126.95) 5 times to advise of TCASII climb. He never answered me. A little later I called center again and advised him of our climb and asked for phone number. I had to ask twice. I called supervisor later that night (ZHU) and advised him of our problem.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT TCASII RA HAD LTSS FROM Y. SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: FO WAS FLYING. ACR X WAS DSNDING THROUGH FL180 WHEN OUR TCASII WARNED US OF 'TFC.' I PUSHED SCALE ON TCASII TO READ 5 MI RADIUS WHEN WE RECEIVED AN RA TO CLB AT 2000 FPM. FO PULLED BACK. WE WERE IMC AT THE TIME. I NEVER SAW TFC Y. OUT OF 18300 FT THE TCASII STOPPED YELLING AT US. I CALLED ZHU (126.95) 5 TIMES TO ADVISE OF TCASII CLB. HE NEVER ANSWERED ME. A LITTLE LATER I CALLED CTR AGAIN AND ADVISED HIM OF OUR CLB AND ASKED FOR PHONE NUMBER. I HAD TO ASK TWICE. I CALLED SUPVR LATER THAT NIGHT (ZHU) AND ADVISED HIM OF OUR PROB.
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.