Narrative:

On approach to sna on kayoh 3 arrival, ATC descended us to 10000 and issued advisory on traffic. Said we would get further descent to 8000 clear of traffic, climbing through our altitude. The other aircraft (also air carrier jet) was told to maintain visual separation from us. TCASII issued TA on this jet at our 1-2 O'clock position less than 3 mi and climbing. Shortly thereafter, a 'climb, climb now' RA was issued -- the entire vertical speed scale was red indicating the need for a maximum effort climb. PF responded promptly to RA and I sighted traffic still climbing at us on intersecting flight path to ours. The other jet made an abrupt left turn and passed behind us and 400 ft below us. We had climbed from 10000 ft to 12500 ft before RA stopped and 'clear of conflict' announced. We were able to contact the PIC of the other aircraft. He stated that, although he was getting a 'descend, descend now' RA, he ignored it and continued to climb! He stated his company policy is to ignore RA's if he deems it to be safe. My company's policy is that RA's must be complied with unless the pilot considers it unsafe to do so. This shows a lack of understanding of the TCASII system by the pilot of the other aircraft. He was unaware of the fact that the TCASII was coordinating our RA's. In addition, all airlines should have a policy to comply with RA's unless a greater threat exists.

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Original NASA ASRS Text

Title: 2 MLG ACFT, OF DIFFERENT ACRS, HAD A BATTLE OF THE TCASII.

Narrative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

Data retrieved from NASA's ASRS site as of July 2007 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.