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False TCASII RA when on final ILS approach. TCASII RA commanded descent and flight crew descended one DOT below GS before the TCASII target disappeared.
| Attributes | |
| ACN | 352556 |
| Time | |
| Date | 199611 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 1100 msl bound upper : 1400 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dfw tower : cle |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 352556 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
At approximately 1400 ft AGL on ILS final runway 18R dfw received a sudden TCASII RA showing an airplane 100 ft directly above us and a descend command. We started down immediately and the display showed the aircraft to be 200 ft above us and then suddenly disappeared. We were in and out of the clouds. We asked dfw tower if they had any traffic in our vicinity and they said the closest was about 3 mi away. We were on GS at first and descended about 1 DOT low and about 300 ft altogether before recovering.
Original NASA ASRS Text
Title: FALSE TCASII RA WHEN ON FINAL ILS APCH. TCASII RA COMMANDED DSCNT AND FLC DSNDED ONE DOT BELOW GS BEFORE THE TCASII TARGET DISAPPEARED.
Narrative: AT APPROX 1400 FT AGL ON ILS FINAL RWY 18R DFW RECEIVED A SUDDEN TCASII RA SHOWING AN AIRPLANE 100 FT DIRECTLY ABOVE US AND A DSND COMMAND. WE STARTED DOWN IMMEDIATELY AND THE DISPLAY SHOWED THE ACFT TO BE 200 FT ABOVE US AND THEN SUDDENLY DISAPPEARED. WE WERE IN AND OUT OF THE CLOUDS. WE ASKED DFW TWR IF THEY HAD ANY TFC IN OUR VICINITY AND THEY SAID THE CLOSEST WAS ABOUT 3 MI AWAY. WE WERE ON GS AT FIRST AND DSNDED ABOUT 1 DOT LOW AND ABOUT 300 FT ALTOGETHER BEFORE RECOVERING.
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.