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ZLA ARTCC controller was informed of an RA when two aircraft were assigned altitudes 1000 feet apart and had each other in sight.
| Attributes | |
| ACN | 881298 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZLA.ARTCC |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Flight Phase | Descent |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Other TCAS RA |
Narrative:
Aircraft X inbound to lax from oceanic control was descended to FL330 for opposite direction traffic at FL320. I called traffic to both aircraft at 7 miles apart just as aircraft X leveled 1000 ft above traffic. Both aircraft called traffic in sight. A minute after passing; aircraft X reported they had a TCAS alert on the traffic; probably due to the high descent rate they had (their words). I asked if it was just an alert or an RA; they said it was an RA. I had not observed any deviation from their clearance on the radar scope. TCAS should be better aware of the assigned altitude and not give RA's indiscriminately.
Original NASA ASRS Text
Title: ZLA ARTCC Controller was informed of an RA when two aircraft were assigned altitudes 1000 feet apart and had each other in sight.
Narrative: Aircraft X inbound to LAX from Oceanic Control was descended to FL330 for opposite direction traffic at FL320. I called traffic to both aircraft at 7 miles apart just as Aircraft X leveled 1000 FT above traffic. Both aircraft called traffic in sight. A minute after passing; Aircraft X reported they had a TCAS alert on the traffic; probably due to the high descent rate they had (their words). I asked if it was just an alert or an RA; they said it was an RA. I had not observed any deviation from their clearance on the radar scope. TCAS should be better aware of the assigned altitude and not give RA's indiscriminately.
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.