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A C750 experienced a TCAS RA with an opposite direction B737 mistakenly level at the same altitude.
| Attributes | |
| ACN | 870544 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Citation X (C750) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Conflict Airborne Conflict |
Narrative:
During our enroute descent we had a TCAS RA requiring a 600 ft altitude deviation. About 100-150 NM out we were descended to FL360 from FL450. While level at the assigned altitude ATC notified us about a couple of aircraft; 1000 ft above or below our altitude; approaching head-on. All aircraft were identified on TCAS and tracked visually. A third target was given by ATC as '737 opposite direction; FL350; between 11 and 12 o'clock; approximately 5 miles; report in sight'. Target was acquired on TCAS and visually identified by both pilots. While closing the traffic; TCAS gave a RA and instructed an immediate climb. We complied with the RA by climbing to FL366 until TCAS showed clear of conflict. We reported the RA and 600 ft deviation required by the TCAS command to ATC while deviating/returning to the assigned altitude. The controller queried the other aircraft who responded that they were assigned 'FL360' (not 350). No further comments regarding the RA or traffic advisory were heard. We were switched to another frequency and landed safely without any further deviation.
Original NASA ASRS Text
Title: A C750 experienced a TCAS RA with an opposite direction B737 mistakenly level at the same altitude.
Narrative: During our enroute descent we had a TCAS RA requiring a 600 FT altitude deviation. About 100-150 NM out we were descended to FL360 from FL450. While level at the assigned altitude ATC notified us about a couple of aircraft; 1000 FT above or below our altitude; approaching head-on. All aircraft were identified on TCAS and tracked visually. A third target was given by ATC as '737 opposite direction; FL350; between 11 and 12 o'clock; approximately 5 miles; report in sight'. Target was acquired on TCAS and visually identified by both pilots. While closing the traffic; TCAS gave a RA and instructed an immediate climb. We complied with the RA by climbing to FL366 until TCAS showed clear of conflict. We reported the RA and 600 FT deviation required by the TCAS command to ATC while deviating/returning to the assigned altitude. The controller queried the other aircraft who responded that they were assigned 'FL360' (not 350). No further comments regarding the RA or traffic advisory were heard. We were switched to another frequency and landed safely without any further deviation.
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.