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TRACON controller described several recent TCAS RA events; wondering if TCAS software has been tightened and/or changed.
| Attributes | |
| ACN | 976702 |
| Time | |
| Date | 201110 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach Departure |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Deviation - Procedural Other / Unknown |
Narrative:
[Using] east flow [operations]; [I] had to vector a few aircraft off of the RNAV arrival for sequencing. This CRJ9 was near the tail end; checked in descending via the RNAV arrival. I stopped the descent at 10;000 ft due to traffic on either side of his track (VFR C182 about 4 NM to the west at 9;500 ft and an IFR P28R about 3.5 NM to the east at 8;000 ft). Neither of these aircraft became a factor; so I issued a descent to 8;000 ft. There were no limited data blocks directly in front of CRJ9 when the pilot said he was responding to an RA. I asked where the TCAS showed the traffic; he said; 'I don't know; but we got the RA.' I really don't know [what to recommend]. This was one of several recently; none of which; in my opinion; should have triggered an RA. Just wonder if there was a recent upgrade to TCAS software that maybe has a bug?
Original NASA ASRS Text
Title: TRACON Controller described several recent TCAS RA events; wondering if TCAS software has been tightened and/or changed.
Narrative: [Using] east flow [operations]; [I] had to vector a few aircraft off of the RNAV arrival for sequencing. This CRJ9 was near the tail end; checked in descending via the RNAV arrival. I stopped the descent at 10;000 FT due to traffic on either side of his track (VFR C182 about 4 NM to the west at 9;500 FT and an IFR P28R about 3.5 NM to the east at 8;000 FT). Neither of these aircraft became a factor; so I issued a descent to 8;000 FT. There were no limited data blocks directly in front of CRJ9 when the pilot said he was responding to an RA. I asked where the TCAS showed the traffic; he said; 'I don't know; but we got the RA.' I really don't know [what to recommend]. This was one of several recently; none of which; in my opinion; should have triggered an RA. Just wonder if there was a recent upgrade to TCAS software that maybe has a bug?
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.