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A BA3201 on approach at 3600 ft responded twice to false TCASII RA's caused by environmental factors.
| Attributes | |
| ACN | 447098 |
| Time | |
| Date | 199908 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : clt.airport |
| State Reference | NC |
| Altitude | msl single value : 3600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : clt.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 32 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 36l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 7100 flight time type : 1500 |
| ASRS Report | 447098 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 240 flight time total : 2000 flight time type : 600 |
| ASRS Report | 447095 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Environmental Factor Aircraft Flight Crew Human Performance |
| Primary Problem | Environmental Factor |
Narrative:
On approach, TCASII showed a target at same altitude right on us. It issued a 'climb' RA, then an 'increase climb' RA. Crew complied. After leveling off, the entire sequence was repeated. TCASII was reset and we were resequenced for ILS and a normal approach and landing followed. Avionics technician reported the problem as the TCASII was reading its own antennae and giving us an RA on our own airplane. After clarifying traffic with ATC, TCASII was reset and normal landing followed. I'm still a firm believer in TCASII. Any RA that is issued, must be complied with.
Original NASA ASRS Text
Title: A BA3201 ON APCH AT 3600 FT RESPONDED TWICE TO FALSE TCASII RA'S CAUSED BY ENVIRONMENTAL FACTORS.
Narrative: ON APCH, TCASII SHOWED A TARGET AT SAME ALT RIGHT ON US. IT ISSUED A 'CLB' RA, THEN AN 'INCREASE CLB' RA. CREW COMPLIED. AFTER LEVELING OFF, THE ENTIRE SEQUENCE WAS REPEATED. TCASII WAS RESET AND WE WERE RESEQUENCED FOR ILS AND A NORMAL APCH AND LNDG FOLLOWED. AVIONICS TECHNICIAN RPTED THE PROB AS THE TCASII WAS READING ITS OWN ANTENNAE AND GIVING US AN RA ON OUR OWN AIRPLANE. AFTER CLARIFYING TFC WITH ATC, TCASII WAS RESET AND NORMAL LNDG FOLLOWED. I'M STILL A FIRM BELIEVER IN TCASII. ANY RA THAT IS ISSUED, MUST BE COMPLIED WITH.
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.