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A dash 8 flight crew reported experiencing an apparent phantom target TCAS event on approach into lga near hpn.
| Attributes | |
| ACN | 899582 |
| Time | |
| Date | 201007 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | LGA.Airport |
| State Reference | NY |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | Traffic Collision Avoidance System (TCAS) |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Commercial |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On approach into lga approximately 18 miles north of the airport on the ILS 22 localizer; we encountered a TCAS RA. We were level at 4;000 ft; and just issued a new clearance to descend to 3;000 ft. Immediately after receiving the new clearance; a TCAS RA was annunciated and a traffic conflict displayed. Our instructions were to climb; climb now; with a climb rate in excess of 1;500 FPM. While I initiated the RA response; [the] captain; who was the pilot not flying; began to search for traffic and told ATC of our actions. The traffic was displayed for no more than 5 seconds and then disappeared. I did not climb to more than 4500 ft. Since we were unable to find the traffic; in VFR conditions; and the short duration of the RA we assumed it was a phantom target. We informed ATC of our suspicion that the RA was due to a phantom target and we were returning to our assigned altitude of 4;000 ft; and confirmed the continued descent to 3;000 ft instruction. The only other information that I would like to add is that this RA happened in close proximity to hpn which is why we took it as a severe threat at first; however after not seeing any traffic; realized it was probably some sort of phantom target.
Original NASA ASRS Text
Title: A Dash 8 flight crew reported experiencing an apparent phantom target TCAS event on approach into LGA near HPN.
Narrative: On approach into LGA approximately 18 miles north of the airport on the ILS 22 Localizer; we encountered a TCAS RA. We were level at 4;000 FT; and just issued a new clearance to descend to 3;000 FT. Immediately after receiving the new clearance; a TCAS RA was annunciated and a traffic conflict displayed. Our instructions were to climb; climb now; with a climb rate in excess of 1;500 FPM. While I initiated the RA response; [the] Captain; who was the pilot not flying; began to search for traffic and told ATC of our actions. The traffic was displayed for no more than 5 seconds and then disappeared. I did not climb to more than 4500 FT. Since we were unable to find the traffic; in VFR conditions; and the short duration of the RA we assumed it was a phantom target. We informed ATC of our suspicion that the RA was due to a phantom target and we were returning to our assigned altitude of 4;000 FT; and confirmed the continued descent to 3;000 FT instruction. The only other information that I would like to add is that this RA happened in close proximity to HPN which is why we took it as a severe threat at first; however after not seeing any traffic; realized it was probably some sort of phantom target.
Data retrieved from NASA's ASRS site as of April 2012 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.