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Cpr LR60 flight crew execute evasive maneuver while conducting an ILS runway 34R approach at ftw airport caused by a TCASII TA and RA. No visible traffic observed. Pilot asks why mode C transponder would be located on a building, abeam the FAF without NOTAM or displayed on approach chart.
| Attributes | |
| ACN | 412653 |
| Time | |
| Date | 199808 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ftw |
| State Reference | TX |
| Altitude | agl bound lower : 600 agl bound upper : 700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ftw |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 60 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing : go around |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 14500 flight time type : 1200 |
| ASRS Report | 412653 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
While making ILS approach to ftw runway 35R, we had a pop-up TCASII target which quickly progressed from a TA to an RA. When I announced to ATC that we were deviating as a result of a TCASII RA, they informed me that it was caused by a transponder on a building, apparently with an encoder, since our TCASII showed an altitude. We were low, 600-700 ft AGL and I assumed it was an inbound helicopter converging with our flight path. I find it unusual that an altitude encoding transponder would be installed on a building, under an ILS, without much publicity, ATIS, remarks on approach plates, etc. The TA/RA certainly got my attention.
Original NASA ASRS Text
Title: CPR LR60 FLC EXECUTE EVASIVE MANEUVER WHILE CONDUCTING AN ILS RWY 34R APCH AT FTW ARPT CAUSED BY A TCASII TA AND RA. NO VISIBLE TFC OBSERVED. PLT ASKS WHY MODE C XPONDER WOULD BE LOCATED ON A BUILDING, ABEAM THE FAF WITHOUT NOTAM OR DISPLAYED ON APCH CHART.
Narrative: WHILE MAKING ILS APCH TO FTW RWY 35R, WE HAD A POP-UP TCASII TARGET WHICH QUICKLY PROGRESSED FROM A TA TO AN RA. WHEN I ANNOUNCED TO ATC THAT WE WERE DEVIATING AS A RESULT OF A TCASII RA, THEY INFORMED ME THAT IT WAS CAUSED BY A XPONDER ON A BUILDING, APPARENTLY WITH AN ENCODER, SINCE OUR TCASII SHOWED AN ALT. WE WERE LOW, 600-700 FT AGL AND I ASSUMED IT WAS AN INBOUND HELI CONVERGING WITH OUR FLT PATH. I FIND IT UNUSUAL THAT AN ALT ENCODING XPONDER WOULD BE INSTALLED ON A BUILDING, UNDER AN ILS, WITHOUT MUCH PUBLICITY, ATIS, REMARKS ON APCH PLATES, ETC. THE TA/RA CERTAINLY GOT MY ATTN.
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.