 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An MD80 experienced 2 TCAS RA's on final to dfw runway 17C. The first RA was climbing; the second descending. ATC reported no traffic. No passenger electronic devices reported.
| Attributes | |
| ACN | 681734 |
| Time | |
| Date | 200512 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | msl single value : 5000 |
| Environment | |
| Weather Elements | Fog Rain |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 681734 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 681735 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter other |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : regained aircraft control flight crew : took evasive action none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were being vectored by dfw approach control for an ILS approach to runway 17C. We were level at 5000 ft in IMC. A target appeared out of nowhere at our altitude and looked to be superimposed upon our aircraft. We got an immediate traffic alert followed by a command to climb at a rate in excess of 2500 ft. I disconnected the autoplt and followed the TCAS resolution. The target continued to show level at our altitude even as we climbed to 6400 ft. We advised approach control that we were responding to an RA. We were reclred to descend to 4000 ft and given vectors to continue the approach. After we were established on the GS we got another similar warning with an aircraft superimposed on our position and again at the same altitude. This time the command was to descend; but before I could take any action; the target and warning disappeared. The flight continued without any further incidents. We wrote up the TCAS system for maintenance action on arrival at dfw. Callback conversation with reporter revealed the following information: reporter stated that he has not received any additional information about this event. He did not consider that the false RA was passenger electronic device interference because of the altitude and the flight attendants not reporting passenger electronic devices in use.
Original NASA ASRS Text
Title: AN MD80 EXPERIENCED 2 TCAS RA'S ON FINAL TO DFW RWY 17C. THE FIRST RA WAS CLBING; THE SECOND DSNDING. ATC RPTED NO TFC. NO PAX ELECTRONIC DEVICES RPTED.
Narrative: WE WERE BEING VECTORED BY DFW APCH CTL FOR AN ILS APCH TO RWY 17C. WE WERE LEVEL AT 5000 FT IN IMC. A TARGET APPEARED OUT OF NOWHERE AT OUR ALT AND LOOKED TO BE SUPERIMPOSED UPON OUR ACFT. WE GOT AN IMMEDIATE TFC ALERT FOLLOWED BY A COMMAND TO CLB AT A RATE IN EXCESS OF 2500 FT. I DISCONNECTED THE AUTOPLT AND FOLLOWED THE TCAS RESOLUTION. THE TARGET CONTINUED TO SHOW LEVEL AT OUR ALT EVEN AS WE CLBED TO 6400 FT. WE ADVISED APCH CTL THAT WE WERE RESPONDING TO AN RA. WE WERE RECLRED TO DSND TO 4000 FT AND GIVEN VECTORS TO CONTINUE THE APCH. AFTER WE WERE ESTABLISHED ON THE GS WE GOT ANOTHER SIMILAR WARNING WITH AN ACFT SUPERIMPOSED ON OUR POS AND AGAIN AT THE SAME ALT. THIS TIME THE COMMAND WAS TO DSND; BUT BEFORE I COULD TAKE ANY ACTION; THE TARGET AND WARNING DISAPPEARED. THE FLT CONTINUED WITHOUT ANY FURTHER INCIDENTS. WE WROTE UP THE TCAS SYS FOR MAINT ACTION ON ARR AT DFW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE HAS NOT RECEIVED ANY ADDITIONAL INFO ABOUT THIS EVENT. HE DID NOT CONSIDER THAT THE FALSE RA WAS PAX ELECTRONIC DEVICE INTERFERENCE BECAUSE OF THE ALT AND THE FLT ATTENDANTS NOT RPTING PAX ELECTRONIC DEVICES IN USE.
Data retrieved from NASA's ASRS site as of January 2009 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.