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An IFR B737 responded to a TCAS RA despite having the VFR traffic in sight and having received a traffic advisory from approach control.
| Attributes | |
| ACN | 871994 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | SCT.TRACON |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Aircraft Undifferentiated or Other Model |
| Component | |
| Aircraft Component | TCAS Software |
| Person 1 | |
| Function | Departure |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Other / Unknown |
Narrative:
I issued traffic between a B737 and a cessna. Both had each other in sight. The B737 still reported responding to an RA. I didn't see the altitude deviation; even though the pilot said they descended a little bit. I believe the software/procedures should be improved so that 500 feet and visual need not cause an RA.
Original NASA ASRS Text
Title: An IFR B737 responded to a TCAS RA despite having the VFR traffic in sight and having received a traffic advisory from Approach Control.
Narrative: I issued traffic between a B737 and a Cessna. Both had each other in sight. The B737 still reported responding to an RA. I didn't see the altitude deviation; even though the pilot said they descended a little bit. I believe the software/procedures should be improved so that 500 feet and visual need not cause an RA.
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.