B737-400 aircraft in cruise had TCASII RA and followed the RA by climbing 200 ft until 'clear of conflict.' postflt conversation with ATC supervisor indicated separation was violated with another aircraft.

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Attributes
ACN	385282
Time
Date	199711
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 9800 flight time type : 2400
ASRS Report	385282
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 15000 flight time type : 4000
ASRS Report	385667
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 5500 vertical : 500
Supplementary
Air Traffic Incident	other

Narrative:

As a first officer and PF, I responded to an RA on our TCASII (flight oakland to santa ana). Socal approach pointed out traffic at our 1 O'clock position moving right to left 500 ft below our altitude. The traffic was apparent on our TCASII, but not visually sighted. When the RA activated, I followed the climb command to 5200 ft. The captain sighted the traffic after it passed to our left. I descended to 5000 ft after the TCASII announced 'clear of conflict.' our airline's policy is to follow RA's in all cases except when it is deemed unsafe to do so. In a phone conversation with socal, the ATC supervisor stated IFR separation was violated with an aircraft 1000 ft (6000 ft MSL) above our flight level.

Original NASA ASRS Text

Title: B737-400 ACFT IN CRUISE HAD TCASII RA AND FOLLOWED THE RA BY CLBING 200 FT UNTIL 'CLR OF CONFLICT.' POSTFLT CONVERSATION WITH ATC SUPVR INDICATED SEPARATION WAS VIOLATED WITH ANOTHER ACFT.

Narrative: AS A FO AND PF, I RESPONDED TO AN RA ON OUR TCASII (FLT OAKLAND TO SANTA ANA). SOCAL APCH POINTED OUT TFC AT OUR 1 O'CLOCK POS MOVING R TO L 500 FT BELOW OUR ALT. THE TFC WAS APPARENT ON OUR TCASII, BUT NOT VISUALLY SIGHTED. WHEN THE RA ACTIVATED, I FOLLOWED THE CLB COMMAND TO 5200 FT. THE CAPT SIGHTED THE TFC AFTER IT PASSED TO OUR L. I DSNDED TO 5000 FT AFTER THE TCASII ANNOUNCED 'CLR OF CONFLICT.' OUR AIRLINE'S POLICY IS TO FOLLOW RA'S IN ALL CASES EXCEPT WHEN IT IS DEEMED UNSAFE TO DO SO. IN A PHONE CONVERSATION WITH SOCAL, THE ATC SUPVR STATED IFR SEPARATION WAS VIOLATED WITH AN ACFT 1000 FT (6000 FT MSL) ABOVE OUR FLT LEVEL.

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.