37000 Feet

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Air carrier at FL370 with ZJX received a TCAS RA climb alert; after questioning ATC the reporter discovered the event was a triple TCAS event. The reporter added rvsm minimum separation at altitude was a causal factor.

Narrative:

Had to execute a TCAS RA climb. Did the maneuver; advised ATC; returned to FL370 when clear of traffic. I asked what was the deal from ATC. He advised us that an aircraft below us was doing a TCAS avoidance from the aircraft below him. Now that doesn't happen too often; but this is what only a 1;000 ft separation at altitude with rvsm will give you. Weather avoidance was a contributing factor.

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Original NASA ASRS Text

Title: Air carrier at FL370 with ZJX received a TCAS RA climb alert; after questioning ATC the reporter discovered the event was a triple TCAS event. The reporter added RVSM minimum separation at altitude was a causal factor.

Narrative: Had to execute a TCAS RA climb. Did the maneuver; advised ATC; returned to FL370 when clear of traffic. I asked what was the deal from ATC. He advised us that an aircraft below us was doing a TCAS avoidance from the aircraft below him. Now that doesn't happen too often; but this is what only a 1;000 FT separation at altitude with RVSM will give you. Weather avoidance was a contributing factor.

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.