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B767-300 first officer reported receiving an apparent false RA on approach to sea; afterwards; ATC reassured them of no reported traffic in the area.
| Attributes | |
| ACN | 1524632 |
| Time | |
| Date | 201803 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SEA.Airport |
| State Reference | WA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Traffic Collision Avoidance System (TCAS) |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude |
Narrative:
While on ILS approach to runway 16L at sea and approaching the final approach fix at approximately 2;000 feet; on glide path; with gear down and flaps 20; we received an aural 'traffic' announcement from TCAS; followed by 'descend descend'. We did not observe any red or yellow traffic on the TCAS; however; we complied with the RA. I clicked off the autopilot and descended below the glide path but still within the scale (no full-scale deflection). The RA concluded; however; there was no 'clear of conflict' aural message. I returned to the glide path and continued for a normal landing. The pilot monitoring inquired with the tower as to any other traffic in the area; and explained that we reacted to an RA; however the tower said there was no other traffic. The weather was VFR and descent did not cause any safety concerns. We believe the TCAS simply put out a false warning.
Original NASA ASRS Text
Title: B767-300 First Officer reported receiving an apparent false RA on approach to SEA; afterwards; ATC reassured them of no reported traffic in the area.
Narrative: While on ILS approach to Runway 16L at SEA and approaching the Final Approach Fix at approximately 2;000 feet; on glide path; with gear down and flaps 20; we received an aural 'TRAFFIC' announcement from TCAS; followed by 'DESCEND DESCEND'. We did not observe any red or yellow traffic on the TCAS; however; we complied with the RA. I clicked off the autopilot and descended below the glide path but still within the scale (no full-scale deflection). The RA concluded; however; there was no 'CLEAR OF CONFLICT' aural message. I returned to the glide path and continued for a normal landing. The Pilot Monitoring inquired with the Tower as to any other traffic in the area; and explained that we reacted to an RA; however the Tower said there was no other traffic. The weather was VFR and descent did not cause any safety concerns. We believe the TCAS simply put out a false warning.
Data retrieved from NASA's ASRS site 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.