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An A300 pilot reports dual mirror image TCAS targets on approach; one 100 ft above; one 100 ft below; leading to an RA evasive climb. First officer saw one aircraft.
| Attributes | |
| ACN | 761637 |
| Time | |
| Date | 200711 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 5000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude ground : maintenance |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Aircraft Undifferentiated or Other Model |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 761637 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : nmac |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : took evasive action |
| Consequence | other |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Arriving ZZZ at approximately 5000 ft; approach issued clearance to slow from 250 KTS to 210 KTS. We noticed 2 targets on TCAS. One at 400 ft above aircraft; the other 400 ft below aircraft. Both targets started to close; TCAS displayed 2 aircraft at 200 ft above and below. Received an RA at 100 ft from aircraft displayed below to climb; which I did. I was not issued vertical speed guidance on the vsi. I climbed until RA terminated and continued to maintain outside vigilance; advised ATC. First officer saw a light cessna aircraft pass off to the right and below. I do question why TCAS displayed 2 targets. Approach confirmed 1 target below aircraft and tagged target aircraft for follow-up. Callback conversation with reporter revealed the following information: the reporter stated that the first officer did indeed see an aircraft below his aircraft about .5 miles away but not one above them as the TCAS would suggest. The TCAS box was removed and sent to maintenance but the reporter has not received a report on the findings.
Original NASA ASRS Text
Title: AN A300 PILOT RPTS DUAL MIRROR IMAGE TCAS TARGETS ON APCH; ONE 100 FT ABOVE; ONE 100 FT BELOW; LEADING TO AN RA EVASIVE CLB. FO SAW ONE ACFT.
Narrative: ARRIVING ZZZ AT APPROX 5000 FT; APCH ISSUED CLRNC TO SLOW FROM 250 KTS TO 210 KTS. WE NOTICED 2 TARGETS ON TCAS. ONE AT 400 FT ABOVE ACFT; THE OTHER 400 FT BELOW ACFT. BOTH TARGETS STARTED TO CLOSE; TCAS DISPLAYED 2 ACFT AT 200 FT ABOVE AND BELOW. RECEIVED AN RA AT 100 FT FROM ACFT DISPLAYED BELOW TO CLB; WHICH I DID. I WAS NOT ISSUED VERT SPD GUIDANCE ON THE VSI. I CLBED UNTIL RA TERMINATED AND CONTINUED TO MAINTAIN OUTSIDE VIGILANCE; ADVISED ATC. FO SAW A LIGHT CESSNA ACFT PASS OFF TO THE R AND BELOW. I DO QUESTION WHY TCAS DISPLAYED 2 TARGETS. APCH CONFIRMED 1 TARGET BELOW ACFT AND TAGGED TARGET ACFT FOR FOLLOW-UP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THE FO DID INDEED SEE AN ACFT BELOW HIS ACFT ABOUT .5 MILES AWAY BUT NOT ONE ABOVE THEM AS THE TCAS WOULD SUGGEST. THE TCAS BOX WAS REMOVED AND SENT TO MAINT BUT THE REPORTER HAS NOT RECEIVED A REPORT ON THE FINDINGS.
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.